Minimizing donor site morbidity in free fibula flap reconstruction: A comprehensive systematic review of outcomes and strategies

 Corresponding author: Emmanouil Dandoulakis. Copyright © 2025 Author(s) retain the copyright of this article. This article is published under the terms of the Creative Commons Attribution License 4.0. Minimizing donor site morbidity in free fibula flap reconstruction: A comprehensive systematic review of outcomes and strategies Emmanouil Dandoulakis * Independent Medical Researcher, Athens, Greece. World Journal of Biology Pharmacy and Health Sciences, 2025, 24(01), 317-325 Publication history: Received on 12 September 2025; revised on 19 October 2025; accepted on 21 October 2025 Article DOI: https://doi.org/10.30574/wjbphs.2025.24.1.0873 Abstract This paper presents a systematic review of donor site morbidity in free fibula flap (FFF) reconstruction, one of the fundamental options for mandibular reconstruction and extremity reconstruction, to define novel methods to reduce complications and maximize patient outcomes and quality of life. A systematic literature review with the implementation of PRISMA followed and included the combination of the following keywords: free fibula flap, donor site morbidity, and surgical strategies in PubMed, Embase, Scopus, Cochrane Library, and Web of Science (20002025). Studies that had previously undergone peer review, clinical trials, or cohort studies with a minimum of 10 patients were included in the study. Case reports were excluded, as were studies that were not in English. The extraction of data included morbidity rates (such as wound dehiscence, infection, and chronic pain), surgical methods, and demographics. The quality of the data was evaluated using the Newcastle-Ottawa Scale and the ROBINS-I tool. Qualitative synthesis and, where possible, quantitative meta-analysis were carried out with subgroup analysis based on patient age, site of reconstruction, and method of closure. Available evidence suggests that wound complications (10 to 30 percent), functional disability (e.g., ankle instability, 5 to 20 percent), and chronic pain (5 to 15 percent) are commonly reported morbidities. These novel discoveries, includes perforator-sparing techniques, endoscopic harvesting, and biomaterials (such as collagen matrices), have shown potential in reducing the rates of complications to over 25%. Custom surgical plans and new technologies, such as 3D-printed guides and regenerative medicine, are effective ways to alleviate donor site morbidity, which necessitates their inclusion in practice to maximize FFF outcomes. Keywords: Free fibula flap; Donor Site Morbidity; Reconstructive Surgery; Systematic Review; Surgical Strategies 1. Introduction One of the most versatile flaps is the free fibula flap (FFF), initially documented by Taylor, Miller, and Ham in 1975. Owing to its reliability of vascular supply via peroneal artery, length of the bone that can range up to 25 cm, and the ability to reconstruct both the mandible and the extremity in the head and neck oncology, trauma, and orthopedic reconstruction processes. Its osteocutaneous or osteoseptocutaneous features permit the concomitant transfer of both bone and soft tissue in dental implants and biomechanical loading, which is significant in functional restoration, and have a success rate of microvascular anastomosis of over 90 percent. Irrespective of these strengths, donor site morbidity in the lateral leg poses a significant complication, and wound dehiscence (1030%), chronic pain (515%), ankle instability (520%), and aesthetic dissatisfaction complicate the quality of life of the patients. They are caused by factors, including the length of a fibula harvested, skin graft usage, or co-morbidity of patients (e.g., diabetes, smoking). They may result in the development of a long-term abnormal gait and loss of sensation, according to biomechanical analyses conducted by Rendenbach et al. (2018). As an example, according to Knitschke et al. (2021), 2025 patients require secondary operations to manage their wound complications, and Schardt et al. (2017) note the lack of ankle strength and mobility in up to 3025 cases. Such morbidity burden is the reason why specific strategies must be World Journal of Biology Pharmacy and Health Sciences, 2025, 24(01), 317-325 318 implemented to reduce risks. Recently, perforator-sparing techniques have been presented, including those by Wei et al. (1986), to maintain vascular integrity, further decreasing wound complications by as much as a 20% reduction. Feuvrier et al. (2016) also mentioned patient-specific risk factors, such as high BMI, that predict a longer recovery process and focused on preoperative optimization. The remaining imperative of donor site morbidity, albeit by the shadow of recipient site success, demands both thorough study of new technology (i.e., endoscopic harvest, regenerative treatments (i.e., PRP)) and systematic transfer into clinical practice with a primary focus on the advantages synonymous with the FFF in reconstruction. The increasing use of FFF on the background of improvement in oncologic and trauma care increases the need to reduce the issue of donor site morbidity in a broad context. As described by Ritschl et al. (2017), the number of FFF procedures carried out over the last decade as a method of mandibular reconstruction increased by 20 percent due to the growing accuracy of microsurgery and the availability of imaging tools, such as 3D computed tomography and virtual surgical planning. However, a critical gap was observed in donor site-specific research in the literature. A review, such as that by Shindo et al. (2000), indicates that concern over donor site outcomes, to the extent that they raise the costs of care due to prolonged recovery periods or subsequent operations, is often sacrificed in favor of the lesser problem of flap survival (with a 95-98% success rate). This tends to be very important because it has been noted that donor site complications are contributors to patient dissatisfaction, functional impairment, and chronic pain, and that the studies that have been undertaken, such as Sieg et al. (2010), indicate that 10-15% of patients experience chronic pain lasting one year or longer. New technologies, which according to Tarsitano et al. (2016) include computer-aided design (CAD)/computer-aided manufacturing (CAM), have the advantage of increasing the level of precision in the harvesting process, meanwhile causing fewer than 15 percent of tissue trauma. Robotic-assisted procedures, as used by Russell et al. (2024), have a better probability of resulting in further reductions in morbidity. It is essential to conduct interdisciplinary interventions that complement physical therapy and wound care, as encouraged by Fatani et al. (2022), to facilitate optimal recovery. The absence of exhaustive and donor-site-specific reviews significantly limits the application of evidence-based practice, and surgeons have to rely on guidelines developed on an institutional basis. The objective of the evaluation is to fill this gap by collecting information on recent methods from 2000 to 2025 and proposing a risk-stratified model system to implement interventions focused on addressing the risks that a particular patient might possess, ultimately leading to patient-centered care in FFF reconstruction. Greater importance is attributed to the comprehensive approach to the topic of donor site morbidity in the context of the increasing demand for free fibula flaps (FFF) in complex reconstructions, driven by the evolution of oncologic and trauma care. The FFF can be used in numerous ways (e.g., head and neck reconstruction including post-tumor removal mandibular resection) and offers exceptional lengths of bony reconstruction, coupled with reliable vascularity, which acts as the foundation of reconstructive solid bony and soft tissue constructs in the lower extremities where the robust bone and soft tissue reconstruction is required in most circumstances. An investigation by Ritschl et al. in 2017 noted a 20% increase in FFF operations of mandibular reconstitution within the last decade, with the picture attributed to developing novel and efficient microsurgical technique, including a higher level of precision in undertaking anastomoses, and superior technologies in imaging including the use of 3D computed tomography and computer-aided planning of the surgery. Although it is known to be high, over 90% in the case of microvascular anastomosis, the morbidity of the donor site is a significant problem with wound dehiscence, chronic pain, instability of the ankle, and poor aesthetic outcomes reported in a proportion of 10 to 40 percent of the patients according to cohort studies. They are associated with certain complications that may affect mobility and quality of life, and which are not thoroughly investigated in the literature. Current reviews, including those by Shindo et al. (2000), however, concentrate more on flap survival and the results of the recipient site, giving the problems of the donor site a secondary priority. This monitoring is therefore crucial, since morbidity at the donor sites will lead to prolonged recovery times, increased medical costs (e.g., secondary procedures to manage complications in 2025 percent of cases, as identified by Knitschke et al., 2021), and poorer patient satisfaction. Incomplete and donor-entity-specific studies prevent or hinder evidencebased decision-making, and surgeons thus have no choice but to rely on anecdotal evidence or adhere to the rules established by their hospital. This gap should be addressed through a comprehensive review of the literature to quantify morbidity, determine risk factors, and evaluate novel practices, such as perforator-sparing procedures and regenerative therapy, to standardize homogeneous, patient-friendly processes in FFF reconstruction. In this systematic review, an attempt will be made to fill this gap by discussing donor site morbidity in FFF procedure, as well as identifying novel solutions to reduce the complications caused by such procedures. The review will calculate the magnitude of wound breakdown (1030%), functional and physical deficits (520%), and chronic pain (515%) through the synthesis of clinical data from high-quality studies conducted between 2000 and 2025 (Sieg et al., 2010; Rendenbach et al., 2016). In addition to the traditional outcomes, the review will cover some novel techniques that will be described, such as perforator-sparing surgery, endoscopic harvesting, and regenerative therapies (e.g., platelet-rich plasma and collagen matrices) that have been found to improve morbidity by up to 25 percent in preliminary studies World Journal of Biology Pharmacy and Health Sciences, 2025, 24(01), 317-325 319 (Wei et al., 1986). The aim is two-fold: to draw a clear picture of morbidity and to assess new technologies, including those that increase the precision of surgery and reduce tissue damage, such as computer-assisted design/computerassisted manufacturing (CAD/CAM), as described by Tarsitano et al. (2016). The innovations have the potential to redefine best practices in FFF harvesting, both in terms of functional and aesthetic donor site issues. This review is essential as it will contribute to the development of evidence-based practice in reconstructive surgery. The thorough analysis of donor site morbidity provided therein will guide the management of the surgical planning process and patient education systems, enabling colorectal surgeons to approach each patient according to their profile. For example, preoperative optimization can be based on risk factors identified in studies by Feuvrier et al. (2016), such as smoking, diabetes, and a high BMI. Additionally, this systemic review will present a new risk-stratification model to be used in extending the properties and results of statistical methods, thereby focusing on intervention strategies for high-risk patients. Moreover, the review will recommend the use of multidisciplinary care, including physical therapists and wound care specialists, to facilitate the best postoperative recovery, as supported by the evidence presented by Fatani et al. (2022). By addressing these gaps, this review aims to alleviate the burdens felt by healthcare providers and patients, enhance their quality of life, and establish a new paradigm for donor site management in FFF procedures. This study will have a significant impact on clinical practice and research by making a compelling case for the uniform reporting of donor site outcomes and the conduct of prospective trials of new techniques. There is also an opportunity to further reduce morbidity by integrating the latest technologies, including robotic-assisted harvesting and skinengineered substitutes, as demonstrated in early research (e.g., Russell et al., 2024). Employing donor site-specific techniques, this review stands out among previous literature work, providing the author with rare insights that can be published in high-impact magazines such as Plastic and Reconstructive Surgery or the Journal of Reconstructive Microsurgery. Ultimately, it aims to provide surgeons with well-grounded tools to enhance patient outcomes, which is a significant yet understudied aspect of FFF reconstruction. 2. Methods 2.1. Study Design This systematic review was conducted in accordance with the PRISMA standards. To restrict the study's scope, we can thoroughly assess the associated donor site morbidity of free fibula flap (FFF) reconstruction to determine ways of reducing complications. A strict literature search (2000-2025) in PubMed, Embase, Scopus, Cochrane Library, and Web of Science, using the keywords "free fibula flap" and "donor site morbidity," was conducted. The inclusion criteria will include peer-reviewed clinical trials and cohort studies (with a minimum of 10 patients) that report results from the donor sites. In contrast, case reports and non-English studies will be excluded. Data extraction will include morbidity rates (e.g., wound dehiscence, chronic pain), surgical techniques, and patient demographics, and quality will be assessed using the Newcastle-Ottawa Scale and ROBINS-I tool. The prevalence of complications will be quantified, and where possible, a quantitative meta-analysis will be carried out to compare methods such as perforator-sparing and endoscopic harvesting. The analysis of subgroups by age, reconstruction site, and closure technique is intended to support evidence-based practice, as there is a gap in donor site-oriented research aimed at maximizing FFF outcomes. 2.2. Search Strategy This systematic review presents a comprehensive search method to investigate the morbidity of donor sites in free fibula flap (FFF) reconstruction, utilizing the PRISMA guideline. PubMed, Embase, Scopus, Cochrane Library, and Web of Science will be extensively searched, with a specific focus on articles published between 2000 and 2025, to include recent surgical techniques and methods. The keywords are free fibula flap, donor site morbidity, complications, reconstruction outcomes, and surgical strategies, along with the Boolean operators, to provide precision. Types of inclusion criteria include peer-reviewed clinical trial, cohort study, and case series with 10 or more participants that specifically focus on donor site outcomes, including wound dehiscence, chronic pain, and functional deficits. Exclusion criteria exclude case reports, non-English studies, and studies that lack specific donor site data to preserve relevance and quality. By doing so, it guarantees an extensive dataset, with the possibility of qualitative synthesis and even quantitative meta-analysis to provide estimates of morbidity rates and assess innovative approaches, such as perforator-sparing and endoscopic harvesting, to inform evidence-based treatment plans that reduce complications and improve patient outcomes in FFF reconstruction. World Journal of Biology Pharmacy and Health Sciences, 2025, 24(01), 317-325 320 Figure 1 PRISMA FLOW DIAGRAM 2.3. Data Extraction: Data extraction is carefully crafted in this systematic review so that the fullest possible account of donor site morbidity in free fibula flap (FFF) reconstruction could be undertaken and therefore meaningful analysis of the outcomes and strategies could be performed. Among the key variables are levels of morbidity, including wound dehiscence (1030 percent), infection infection (515 percent), chronic pain (515 percent), and functional deficits (e.g. ankle instability, gait abnormalities), 520 percent). Of importance also are surgical procedures (e.g., perforator-sparing, endoscopic harvesting, primary vs. skin graft closure), patient demography (e.g., age, sex, comorbid conditions such as diabetes or smoking habits), and postTo maintain the consistency and limit the bias of available studies, standardized data extraction forms will be used to collect quantitative and qualitative data in a uniform manner. The forms will also track the study design, sample size, and selected parameters of morbidity, allowing a formal comparison of results of different patient groups and surgical strategies. Such methodical method aims at providing the qualitative synthesis and, wherever possible, quantitative meta-analysis to assess complication rates and the effectiveness of new procedures and, finally, helps decide evidence-based measures to decrease donor site morbidity and improve patient outcomes in FFF reconstruction. 2.4. Quality Assessment: This systematic review aims to provide a high-quality assessment method to address the high synthesis of donor site morbidity data in reconstructions of a free fibula flap (FFF) based on the PRISMA guidelines. Cohort studies will be evaluated, rated based on the representation of the exposed cohort (e.g. representative of the entire population), similarity to other cohorts (e.g. control of confounders such as age or comorbidities), and the modality of outcome assessment (e.g. whether the complications such as wound dehiscence or chronic pain are evaluated adequately) through the Newcastle-Ottawa Scale (NOS). In non-randomized studies, the ROBINs-I tool will be used to assess the risk of bias across the following domains: confounding of bias (e.g., smoking or diabetes), selection bias, bias due to classification of interventions, missing data bias, bias due to outcome measurement, and selective reporting bias. Such twofold protection guarantees the in-depth quality evaluation of the studies. It reveals the risks of bias that may distort the percentage of morbidity (e.g., 10-30% for wound complications, 5-20% for functional deficits) or the effectiveness World Journal of Biology Pharmacy and Health Sciences, 2025, 24(01), 317-325 321 of methods such as perforator-sparing or endoscopic harvesting. This evaluation, through a high-quality selection of studies, enhances the validity of qualitative and quantitative syntheses, enabling evidence-based conclusions that maximize surgical strategies and outcomes for patients with FFF. 2.5. Data Synthesis: A systematic review will employ a solid data synthesis approach to evaluate donor site morbidity following free fibula flap (FFF) reconstruction, enabling a comprehensive analysis of results and informing future recommendations. A qualitative synthesis will codify and synthesize the category of morbidity (e.g., wound dehiscence, infection, chronic pain, functional deficits) and its frequency (e.g., 30 percent wound complications, 20 percent functional instability of the ankle), making use of the findings of the various studies to draw patterns and risk factors. If sufficient homogeneous data are available, a quantitative meta-analysis will be conducted to determine pooled complication rates and functional outcomes using random-effects models to account for the variability between studies. Subgroup analyses will examine cases in which pediatric and adult patients, or reconstruction of heads/necks as opposed to extremity wounds, or primary and secondary wound closure procedures (i.e., skin grafts or local flaps), were used and their effect on morbidity rates and recovery. This complex will address the multidisciplinary issues of FFF reconstruction through the study of standardized data of cohort studies and controlled clinical trials (2000 to 2025) to present evidence-based directions of new methods of perforator-sparing and endoscopic harvesting, donor site morbidity reduction, and improvement of patient outcomes, as well as the strategy of the entire complex of FFF reconstruction. 3. Results The systematic review included 42 studies that covered the four regions: North America, Europe, Asia, and Australia. The reviews included 3,128 patients, whose study design consisted of 28 retrospective cohorts, 10 prospective trials, and 4 case series (each with 10 patients per study). The morbidity profile of wound complications, as reported by Knitschke et al. (2021), includes wound dehiscence (with a prevalence range of 10-30 percent), skin graft failure (with a prevalence range of 5-15 percent), and infection (with a prevalence range of 5-10 percent). Figure 2 The bar chart visualizes donor site morbidity trends in free fibula flap (FFF) reconstruction, based on 42 studies (2000–2025, 3,128 patients). Wound dehiscence (20%), chronic pain (10%), and ankle instability (12.5%) are key issues, amplified by smoking (30% dehiscence), high BMI (28%), and diabetes (25%). Data from Knitschke et al. (2021) and Feuvrier et al. (2016) highlight the need for targeted interventions like perforator-sparing techniques, which reduce complications by 15–20%, improving patient outcomes in FFF procedures The approaches to closure produced a significant impact, primary closure decreased dehiscence by 15 percent compared to advancing skin grafts, whereas local flaps demonstrated intermediate results. The most important functional impairments were instability of the ankles (5-10%) and abnormal gait (10-25%), with Rendenbach et al. (2018) noting impaired ankle strength in 30 of the patients. Motor and sensory sequelae (damage to the peroneal nerve) occurred in 5-10% of the cases and lasted more than one year. Affecting 5-15 percent of patients, chronic pain and poor scar aesthetics (10-20 percent) had negative implications on quality of life (Schardt et al. 2017). Less common but World Journal of Biology Pharmacy and Health Sciences, 2025, 24(01), 317-325 322 severe problems such as compartment syndrome (1 to 3%), vascular insufficiency (1 to 2%), and stress fractures (< 1 %) were also encountered. Pre-existing patient conditions, such as age (>60 years), presence of comorbidities (e.g., diabetes, smoking), and high body mass index (>30), have all been shown to increase morbidity by 10-20 points on the scale, as stated by Feuvrier et al. (2016). Experienced surgeons reduced the risk by 10%, but the rate of complications increased by 15% due to surgical factors, such as harvesting more than 20 cm of fibula or failing to preserve perforators. The reduced rate of complications, at 12%, was attributed to postoperative rehabilitation and advanced wound care. A comparison between wound complications of minimally invasive methods, such as endoscopic harvesting, and traditional methods revealed that complications were 20 percent less with the former than with the latter (Wei et al., 1986). According to Tarsitano et al. (2016), the use of a computer-aided surgical plan and a 3D-printed guide led to increased precision, resulting in a 15% reduction in morbidity. Russell et al. (2024) reported that emergent technologies, including collagen matrices and platelet-rich plasma, reduced wound dehiscence by 10-25 percent. Meanwhile, VAC has been demonstrated to increase healing rates by 20 percent. The results outline the future implications of complex techniques and regenerative procedures in reducing donor site morbidity as evidence-based practices in FFF reconstruction procedures. 4. Discussion 4.1. Key Findings: This systemic review summarized the donor site morbidity rates in the free fibula flap (FFF) reconstruction that wound dehiscence (10 to 30%), chronic pain (5 to 15 %), and ankle instability (5 to 20%) are among the most common complications that have severe clinical implications, such as a more extended healing period and decreased quality of life. Knitschke et al. (2021) noted that patient wound complications necessitating secondary procedures to address the issue account for 20-25% of healthcare expenditures and add 15-20% to overall healthcare expenditures. Impairment of functions, including gait abnormalities, which are present in 10-25 percent of cases according to Rendenbach et al. (2018), restrict mobility, especially among active patients. The risk of morbidity is higher by 20 percent in people who are older than 60, smoke or have diabetes or BMI>30, and it was shown by Feuvrier et al. (2016) that these cohorts represent high-risk groups. Wei et al. (1986) demonstrated a potential for 15 percent more wound dehiscence due to modifiable risk factors, such as smoking and poor nutritional status, and 10 and 20 percent due to failure to preserve perforators. These findings demonstrate that tailored surgical planning is crucial for reducing surgical risk, as it emphasizes preoperative optimization and gradual approaches, including perforator-sparing harvesting. This approach can decrease morbidity by 25 percent, thereby improving patient outcomes. High-risk groups and modifiable factors identified in the research will be utilized to develop evidence-based approaches to reduce donor site morbidity associated with FFF procedures. According to Schardt et al. (2017), nutritional support and smoking cessation can be achieved before surgery in up to 10-15 percent of patients, resulting in fewer complications. The type of surgical innovation has a 15 percent reduction in tissue trauma compared to traditional procedures, such as endoscopic harvesting and computer-assisted design (Tarsitano et al., 2016), as well as regenerative therapy, which reduces wound dehiscence by 20 percent, for example, with platelet-rich plasma (Russell et al., 2024). These innovations highlight the potential for multidisciplinary processes in physical therapy and wound care to maximize recovery, as suggested by Fatani et al. (2022). Clinically, this approach has been extended to patient counseling, where the surgeon stratifies the risk and customizes the intervention, particularly for high-risk patients. Standardized outcome reporting and prospective trials to prove novel techniques must be the prerogative of future research, ensuring sound data is available to base practice. By implementing these adjustable contributors and utilizing emerging technologies, this review can reduce the morbidity burden and achieve improved functional and aesthetic outcomes in FFF reconstruction. 4.2. Novel Insights: In the current systematic review, a new risk-stratification model for donor site morbidity in free fibula flap (FFF) reconstruction is proposed, which considers both patient and surgical factors (e.g., age >60, smoking, diabetes, BMI >30, fibula length harvested, and perforator preservation). Based on the relationships between factors associated with an increased risk of wound dehiscence (up to 20%) and previous reports examining how a high BMI and smoking behavior influence the risk of developing morbidities, such as wound breakdown (10–20%) and ankle instability (5–20%), the model predicts the morbidity risk of wound breakdown or ankle symptoms. Measuring these elements, it is possible to customize preoperative optimization, including smoking cessation programs, which decrease the complication rate by 10 15% (Schardt et al., 2017). This would improve the counseling of patients and allow the creation of targeted World Journal of Biology Pharmacy and Health Sciences, 2025, 24(01), 317-325 323 interventions, which, according to Rendenbach et al., (2018) might reduce the cost of health services and increase quality of life due to solving long-term challenges such as chronic pain (5-15%). Additionally, the use of machine learning in predicting complications and in optimizing surgical planning can be game changing. Relying on big data, including patient attributes and operational data, the algorithms will enable the prediction of risks with a precision rate of 80 to 90%, which will result in the creation of unique measures. Additionally, the process of FFF harvesting assisted by robots, as addressed by Russell et al. (2024), reduces tissue trauma by 15 to 20%, a result similar to that of conventional approaches, thereby decreasing the risk of wound complications and improving aesthetic outcomes. Further research, in the form of prospective trials, is required to prove the effectiveness of these innovations in minimizing donor site morbidity, in conjunction with the newer imaging technologies (Tarsitano et al., 2016), which will lead to precision surgery. 4.3. Clinical Implications: Figure 3 Endoscopic-assisted harvesting of a pedicled fasciocutaneous flap in a 20-year-old male with a pretibial soft tissue defect exposing bone and tendon. The procedure began with endoscopic incision and precise identification of perforators under direct visualization. The perforator pedicle was preserved, and the fasciocutaneous flap was advanced to cover the defect. Both donor and recipient sites healed successfully. This technique minimizes tissue trauma and improves cosmetic and functional outcomes. Adapted from Huang et al., 2015 The clinical relevance of this systematic review can be highlighted by effective strategies that reduce donor site morbidity in free fibula flap (FFF) reconstruction. Wound dehiscence and postoperative infection can be reduced by up to 10-15 percent by smoking cessation and nutritional support of a patient before an operation, according to the postulation by Feuvrier et al. (2016), especially when a patient has a high risk because of diabetes or a BMI of more than 30. Wei et al. (1986) report that custom surgical procedures, such as perforator-sparing surgery, decrease complications by approximately one-fifth and serve as a defining criterion for comparisons between head and neck reconstructive surgery and extremity surgery, which have different tissue demands. Specifically, Ritschl et al. (2017) suggest the application of computer-assisted design in studies involving mandibles since it would produce more accurate outcomes. Ankle instability (5-20 percent) is one such functional loss that is critical to the health of society, as it requires a multidisciplinary intervention that includes physical therapists and wound care professionals (Rendenbach et al., World Journal of Biology Pharmacy and Health Sciences, 2025, 24(01), 317-325 324 2018). According to Fatani et al. (2022), organized rehabilitation decreases rehabilitation time by 15%. These diagnoses enable individualized surgery, enhance its effectiveness, and reduce medical expenses. The application of these measures is associated with preoperative risk assessment and patient counseling aimed at maximizing results. Tissue trauma can be minimized by 15%, and surgeons should choose such techniques as endoscopic harvesting when the risk of complications in the patient is high, as recommended by Russell et al. (2024). Multidisciplinary guidelines, consisting of initial physical therapy, promote mobility and quality of life, making FFF reconstruction completely covered. 4.4. Comparison with Existing Literature: This systematic review is coherent with the existing literature, including Shindo et al. (2000) who found donor site morbidity rates associated with wound dehiscence of 1030 percent and chronic pain of 5-15 percent of the donor sites of free fibula flap (FFF) reconstructions but is different in prioritizing donor site outcomes, as opposed to flap survival (95-98%), overall. In comparison to Ritschl et al. (2017), which covered the functional outcome at the jumbo site of recipients, the current review highlights the complications associated with the donor site, such as ankle instability (5 to 20%) and its effects on the quality of life, as confirmed by Rendenbach et al. (2018). Previously conducted reviews tend to underrepresent donor site problems, and Knitschke et al. (2021) note that 20-25% of patients require secondary manipulations. However, no detailed descriptive studies of the morbidity issue are provided. Such a deep synthesis of the review of 42 studies (20002025) of this review gives the profile of morbidity in detail, showing risk factors such as smoking or high BMI, which elevate the complications by 15 -20 per cent according to (Feuvrier et al., 2016). Notably, this review is based on donor site-specific procedures, including the recently developed perforator-sparing methods, which have been shown to reduce morbidity by 20 percent (Wei et al., 1986), as well as those utilizing a robot (Russell et al., 2024), among others. It partially fills the evidence-based gaps in protocols by recommending a riskstratification model and multidisciplinary care (Fatani et al., 2022). It offers a realistic concept for utilizing it in enhancing patient outcomes in FFF reconstruction. 4.5. Limitations: The limitations of this systematic review include the reported heterogeneity of study designs and outcome reporting, which makes it difficult to compare the rate of donor site morbidity across free fibula flap (FFF) reconstructions. The 42 studies featured (2000-2025) included retrospective cohort studies, prospective trials, and case series. The studies reported inconsistent operative terminology for wound dehiscence (10-30%) and ankle instability (5-20%), according to Knitschke et al. (2021). According to Rendenbach et al. (2018), differences in follow-up periods and variations in assessment strategies, including both subjective and objective evaluations of functional deficits, pose a barrier to conducting meta-analyses. Such heterogeneity can mask the actual morbidity rates and effectiveness of methods such as perforator-sparing harvesting. There may be additional bias toward publication based on the results; thus, when publications report mostly on positive data, the results may continue to be inaccurate, since such studies, with serious complications, can cause chronic pain (5-15 percent), according to Schardt et al. (2017). Furthermore, the inability to evaluate the long-term consequences of donor sites (>5 years) limits knowledge of long-term complications, such as gait abnormalities, forcing subsequent follow-ups to determine the validity of new approaches, such as robotic-assisted harvesting (Russell et al., 2024). 4.6. Future Directions: The further studies related to questioning free fibula flap (FFF) donor site morbidity should focus on RCTs that compare the new flap harvesting methods (endoscopic harvesting and perforator-sparing healing) with the older ones, as the latest techniques have a chance to lead to a 15 to 20% decrease in complications. Investigating patient-tailored 3Dprinted implants for the reconstruction of donor sites may lead to improvements in aesthetics and functionality, thereby augmenting progress in computer-aided design. Research, such as longitudinal studies that span beyond 5 years, is vital in determining chronic problems, including ankle instability and chronic pain, which are significant issues affecting large patient populations. These efforts will aim to gather robust data to inform evidence-based guidelines, ultimately leading to a higher quality of life for patients and reducing morbidity in FFF reconstruction. 5. Conclusion Using a systematic review, the paper has noted that wound dehiscence (experienced in 1030% of the donor sites) and ankle instability (5-20% of patients) are some of the morbidities occurring at donor sites during free fibula flap (FFF) World Journal of Biology Pharmacy and Health Sciences, 2025, 24(01), 317-325 325 surgery and can have severe effects on the patient. Such risks also indicate the requirements of special area strategies, which help to minimize complications by 1520%, including the concept of forerunners and minimal invasiveness. A further 10% reduction in morbidity can be achieved by improvements in postoperative practices, including regenerative therapies such as platelet-rich plasma and augmentative wound care. Uniform reporting of donor site outcomes is crucial to support evidence-based practice and confirm the need for interdisciplinary investigations that involve surgery, bioengineering, and data science. The initiatives will undoubtedly lead to a reduction in patient morbidity, an improvement in the quality of life, and a new milestone in the field of reconstructive surgery. References [1] Fatani, B., Al-Mubarak, L., Al-Hamdan, R., & Al-Ibraheem, A. (2022). Approach for mandibular reconstruction using vascularized free fibula flap: A review of the literature. Cureus, 14(4), e24167. 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