Keyhole Surgery for the TMJ: The Endoscopic Breakthrough

International Journal of Dental Science and Innovative Research (IJDSIR) IJDSIR : Dental Publication Service Available Online at:www.ijdsir.com Volume – 8, Issue – 5, September – 2025, Page No. : 10 - 14 Corresponding Author: Dr. Pooja Gopal Choudhary, ijdsir, Volume – 8 Issue - 5, Page No. : 10 - 14 Page10 ISSN: 2581-5989 PubMed - National Library of Medicine - ID: 101738774 Keyhole Surgery for the TMJ: The Endoscopic Breakthrough 1Dr. Pooja Gopal Choudhary, Fellowship in Oral Oncology and Reconstruction Surgery, HCG Aastha Cancer Hospital, Ahmedabad 2Prof. Dr. Natashekara Mallesh, PhD (Oral and Maxillofacial Surgery) Research Scholar, Nirwan University, Jaipur 3Dr. Vaibhav Anand, Assistant Professor, Department of Oral and Maxillofacial Surgery, Uttar Pradesh University of Medical Sciences, Saifai, Etawah 4Dr. Soumalya Das, Junior Resident, Department of Oral and Maxillofacial Surgery, Mithila Minority Dental College and Hospital, Ekmighat, Laheriasaeai, Darbhanga-846001, Bihar, India 5Dr. Mansi Sehrawat, Dentist, Daswani Dental College, Rajasthan University of Health Sciences 6Dr. Krutika Malakar, BDS, Dentist, Sri Aurobindo College of Dentistry Corresponding Author: Dr. Pooja Gopal Choudhary, Fellowship in Oral Oncology and Reconstruction Surgery, HCG Aastha Cancer Hospital, Ahmedabad Citation of this Article: Dr. Pooja Gopal Choudhary, Prof. Dr. Natashekara Mallesh, Dr. Vaibhav Anand, Dr. Soumalya Das, Dr. Mansi Sehrawat, Dr. Krutika Malakar, “Keyhole Surgery for the TMJ: The Endoscopic Breakthrough”, IJDSIRSeptember – 2025, Volume – 8, Issue – 5, P. No. 10 – 14. Copyright: © 2025, Dr. Pooja Gopal Choudhary, et al. This is an open access journal and article distributed under the terms of the creative common’s attribution non-commercial License. Which allows others to remix, tweak, and build upon the work non-commercially, as long as appropriate credit is given, and the new creations are licensed under the identical terms. Type of Publication: Original Research Article Conflicts of Interest: Nil Abstract Background: Temporomandibular joint (TMJ) disorders are a major cause of chronic orofacial pain and functional limitation. Conventional open surgeries for TMJ internal derangements, ankylosis, and degenerative pathologies— though effective—carry significant morbidity, cosmetic concerns, and longer rehabilitation. The advent of minimally invasive endoscopic “keyhole” techniques has introduced a paradigm shift by enabling direct intraarticular visualization and intervention through small portals. Objective: To provide a comprehensive overview of keyhole (endoscopic) TMJ surgery, highlighting its evolution, indications, techniques, advantages over traditional methods, clinical outcomes, and future prospects. Methods: This article reviews literature, clinical case series, and technological innovations in TMJ arthroscopy and endoscopy, analyzing both diagnostic and therapeutic roles. Comparative evaluation with open TMJ surgery is included to assess outcome differentials. Results: Endoscopic TMJ surgery reduces operative trauma, enhances precision, improves cosmetic Dr. Pooja Gopal Choudhary, et al. International Journal of Dental Science and Innovative Research (IJDSIR) ©2025 IJDSIR, All Rights Reserved Page11 Page11 Page11 Page11 Page11 Page11 Page11 Page11 Page11 Page11 Page11 Page11 Page11 Page11 Page11 Page11 Page11 Page11 Page11 outcomes, and shortens recovery time. It is effective in managing early-to-moderate internal derangements, synovitis, adhesions, and degenerative changes. Limitations include cost, steep learning curve, and reduced efficacy in advanced ankylosis. Conclusion: Endoscopic TMJ surgery is a breakthrough technique that is transforming TMJ management. As instrumentation, imaging, and biologic adjuncts advance, keyhole approaches are expected to become the standard of care worldwide. Keywords: Temporomandibular Joint, TMJ Disorders, Endoscopy, Arthroscopy, Keyhole Surgery, Minimally Invasive Maxillofacial Surgery Introduction The temporomandibular joint (TMJ) is one of the most complex joints in the human body, facilitating mandibular movements essential for mastication, phonation, and expression. TMJ disorders (TMDs) affect nearly 10–15% of the global population, with women being disproportionately affected. Symptoms include pain, joint noises, limited mouth opening, and functional impairment, significantly impacting quality of life. 1 Conservative therapies—such as physiotherapy, occlusal splints, pharmacotherapy, and intra-articular injections— are successful in many cases. However, 10–20% of patients remain refractory and require surgical intervention. Historically, open joint surgeries such as discectomy, arthroplasty, and joint replacement were performed. While these procedures address pathology, they are associated with: 2,3  Large extraoral incisions leading to visible scarring  Risk of facial nerve injury  Significant postoperative swelling and pain  Prolonged hospital stays  Risk of reduced mandibular mobility due to fibrosis In the late 1970s, TMJ arthroscopy was introduced, marking the transition toward minimally invasive interventions. Over time, improvements in optics, instrumentation, and technique have culminated in modern endoscopic keyhole surgery, which combines diagnostic visualization with therapeutic precision through portals as small as 1–2 mm.4 This article elaborates how endoscopic TMJ surgery has become a breakthrough, redefining the surgical landscape and shifting the treatment philosophy from “open access and excision” to “minimally invasive preservation and repair.” Discussion 1. Evolution of Endoscopic TMJ Surgery 5-7  1970s: Introduction of arthroscopic lavage and lysis of adhesions.  1980s–1990s: Refinement with fiber-optic endoscopes and miniaturized instruments.  2000s: Development of biportal techniques, allowing simultaneous visualization and instrumentation.  Recent advances: High-definition endoscopes, angled optics (30°/70°), and powered shavers enabling procedures previously possible only with open surgery. 2. Indications 8,9 Endoscopic TMJ surgery is indicated for:  Internal derangements (disc displacement with or without reduction)  Intra-articular adhesions  Synovitis, rheumatoid or psoriatic arthritis involvement  Early degenerative joint disease (osteoarthrosis)  Chronic inflammatory conditions unresponsive to conservative therapy Dr. Pooja Gopal Choudhary, et al. International Journal of Dental Science and Innovative Research (IJDSIR) ©2025 IJDSIR, All Rights Reserved Page12 Page12 Page12 Page12 Page12 Page12 Page12 Page12 Page12 Page12 Page12 Page12 Page12 Page12 Page12 Page12 Page12 Page12 Page12  Persistent closed lock and restricted mandibular movements  Diagnostic evaluation of inconclusive MRI/CT findings Contraindications include severe joint ankylosis, endstage osteoarthritis with gross deformity, and cases requiring joint replacement. 3. Keyhole Techniques and Procedures 10 Diagnostic Arthroscopy: Allows direct visualization of the upper joint compartment, disc position, synovial health, and adhesions. Arthrocentesis under Endoscopic Guidance: Improves lavage accuracy, flushing inflammatory mediators and restoring joint mobility. Lysis and Lavage: Adhesions are mechanically disrupted and irrigated, reducing pain and improving mouth opening. Disc Repositioning/Repair: Endoscopic suturing and anchoring techniques correct displaced discs with higher precision than blind maneuvers. Synovectomy: Inflammatory synovium is ablated using electrocautery or laser-assisted endoscopy. Reshaping of Condyle/Articular Surfaces: Shavers and burrs can contour irregularities in early degenerative cases. 4. Advantages Over Open TMJ Surgery 11  Minimal Invasiveness: Portals of 1–2 mm vs large preauricular incisions.  Reduced Morbidity: Less swelling, scarring, and nerve damage.  Enhanced Visualization: High magnification enables early detection of synovitis or microadhesions missed in open surgery.  Faster Rehabilitation: Patients resume normal diet and activity earlier.  Cosmetic Superiority: Invisible scars compared to conspicuous preauricular/retromandibular scars.  Dual Diagnostic & Therapeutic Role: Unlike MRI, endoscopy allows real-time intervention. 5. Comparative Outcomes 12 Parameter Open TMJ Surgery Endoscopic/Keyhole Surgery Incision size 4–6 cm 1–2 mm portals Recovery time 2–4 weeks 3–7 days Facial nerve injury risk 3–10% <1% Scarring Visible, permanent Minimal/invisible Pain relief & function High but variable High, with faster onset Revision requirement Moderate Low (when performed early) Clinical studies report success rates of 70–90% for pain reduction and functional improvement with endoscopic TMJ surgery, comparable or superior to open techniques but with reduced complications. Limitations and Challenges 13,14  Learning Curve: Requires advanced training in arthroscopy and microsurgical techniques.  Equipment Costs: High-definition endoscopes and precision instruments are expensive. Dr. Pooja Gopal Choudhary, et al. International Journal of Dental Science and Innovative Research (IJDSIR) ©2025 IJDSIR, All Rights Reserved Page13 Page13 Page13 Page13 Page13 Page13 Page13 Page13 Page13 Page13 Page13 Page13 Page13 Page13 Page13 Page13 Page13 Page13 Page13  Restricted Efficacy: In advanced ankylosis or severely deformed joints, open or replacement surgery is still required.  Access Inequality: Limited adoption in low-resource regions.  Procedure Standardization: Lack of universal protocols leads to variability in outcomes. Conclusion Endoscopic keyhole surgery has revolutionized TMJ management by enabling precise intra-articular interventions through minimal access. It preserves joint structures, reduces patient morbidity, and offers superior cosmetic outcomes compared to traditional open surgery. For patients with internal derangements, adhesions, or early degenerative disease, it is now considered the procedure of choice, while open approaches are reserved for advanced or refractory cases. By merging diagnostic and therapeutic capabilities into a single minimally invasive procedure, TMJ endoscopy has transformed treatment philosophy, emphasizing restoration and preservation over excision. Future Directions 1. Robotics in TMJ Endoscopy: Robotic assistance could stabilize delicate movements, making surgery safer and more precise. 2. AI-Enhanced Navigation: Artificial intelligence integrated with endoscopic imaging could help identify subtle pathology and predict surgical outcomes. 3. Biologic Therapies under Endoscopic Guidance: Direct intra-articular delivery of platelet-rich plasma, stem cells, or gene therapies could be combined with mechanical interventions. 4. 3D Imaging Integration: Coupling cone-beam CT with real-time endoscopy for augmented reality guidance. 5. Nanoinstruments & Flexible Endoscopes: Future devices may allow access to deeper compartments with minimal trauma. 6. Standardization & Training: Global protocols, simulation-based training modules, and widespread access to equipment will ensure equitable outcomes. References 1. Pedroletti F, Johnson BS, McCain JP. Endoscopic techniques in oral and maxillofacial surgery. Oral Maxillofac Surg Clin North Am. 2010;22:169–82. doi: 10.1016/j.coms.2009.11.002. [DOI] [PubMed] [Google Scholar] 2. Frey M, editor. Endoscopy and Microsurgery. New York: Springer-Verlag Wien; 2001. [Google Scholar] 3. Semm K. Atlas of Gynecologic Laparoscopy and Hysteroscopy. Philadelphia: WB Saunders; 1977. [Google Scholar] 4. Paterson-Brown S, Garden J, editors. Principles and Practice of Surgical Laparoscopy. 1st ed. London: WB Saunders; 1994. [Google Scholar] 5. Tagaki K. Practical experience using Tagaki's a throscope. Jpn J Orthop Assoc. 1933;8:132. [Google Scholar] 6. Tagaki K. The arthroscope. Jpn J Orthop Assoc. 1939;14:359. [Google Scholar] 7. Ogle OE, Dym H. Surgery of the nose and paranasal sinuses: Principles and concepts. Oral Maxillofac Surg Clin North Am. 2012;24:xiii–xiv. doi: 10.1016/ j.coms.2012.02.001. [DOI] [PubMed] [Google Scholar] 8. Kobayashi S, Sakai Y, Yamada A, Ohmori K. Approaching the zygoma with an endoscope. J Craniofac Surg. 1995;6:519–24. doi: 10.1097/ 00001665-199511000-00022. [DOI] [PubMed] [Google Scholar] Dr. Pooja Gopal Choudhary, et al. International Journal of Dental Science and Innovative Research (IJDSIR) ©2025 IJDSIR, All Rights Reserved Page14 Page14 Page14 Page14 Page14 Page14 Page14 Page14 Page14 Page14 Page14 Page14 Page14 Page14 Page14 Page14 Page14 Page14 Page14 9. Gokcan MK, Kucuk B, Yazicioglu D, Tuzuner Oncul A. Four hands technique in transoral endoscopeassisted fixation of condyle fractures. J Otolaryngol Head Neck Surg. 2010;39:442–7. [PubMed] [Google Scholar] 10. Beltrán V, Cantín M, Borie E, Fuentes R, Engelke W. Endoscopic removal of a supernumerary premolar in the mandible during a dental implant placement. Case Rep Dent 2014. 2014 doi: 10.1155/2014/975470. 975470. [DOI] [PMC free article] [PubMed] [Google Scholar] 11. Satwalekar P, Reddy BA, Chander KS, Reddy GR, Agarwal T, Chowdary SG. Endoscopic retrieval of dental implant from maxillary sinus. J Contemp Dent Pract. 2013;14:759–61. doi: 10.5005/jp-journals10024-1398. [DOI] [PubMed] [Google Scholar] 12. Suarez-Cunqueiro MM, Schoen R, Schramm A, Gelrich NC, Schmelzeisen R. Endoscopic approach to removal of an ectopic mandibullar third molar. Br J Oral Maxillofac Surg. 2003;41:340–2. doi: 10.1016/s0266-4356(03)00111-6. [DOI] [PubMed] [Google Scholar] 13. Stavropoulos SN, Modayil R, Friedel D. Achalasia. Gastrointest Endosc Clin N Am. 2013;23:53–75. doi: 10.1016/j.giec.2012.10.008. [DOI] [PubMed] [Google Scholar] 14. Adam MA, Speicher P, Pura J, Dinan MA, Reed SD, Roman SA, et al. Robotic thyroidectomy for cancer in the US: Patterns of use and short-term outcomes. Ann Surg Oncol. 2014;21:3859–64. doi: 10.1245/ s10434-014-3838-8. [DOI] [PMC free article] [PubMed] [Google Scholar]