Analyze Diet
Equine veterinary journal2025; doi: 10.1111/evj.14462

Equine temporomandibular joint diseases: A systematic review.

Abstract: The temporomandibular joint (TMJ) is a unique joint that enables mandibular movement. Temporomandibular diseases (TMDs) impair joint function, leading to more or less specific clinical signs. Objective: To compile and disseminate clinical data and research findings from existing publications on equine TMD. Methods: Systematic review. Methods: Following PRISMA 2020 guidelines, literature searches were conducted in PUBMED, Scopus, and Web of Knowledge. The inclusion criteria covered case reports and research articles on equine TMDs. The selected records were grouped considering septic TMJ arthritis, primary TMJ osteoarthritis (OA), and non-arthritic TMDs. A risk of bias assessment was performed for the research articles. Results: Equine TMD has been described in 51 publications to date, with septic TMJ arthritis accounting for 41.2% of TMD cases, fractures/luxations for 29.4%, and primary TMJ OA for 21.6%. Trauma was confirmed or suspected in 54.9% of TMD cases. The severity of clinical signs was mild to moderate in primary TMJ OA and mild to severe in septic TMJ arthritis and non-arthritic TMDs. Clinical signs were related to the underlying cause, particularly in terms of TMJ swelling, pain, and masticatory problems. Among diagnostic imaging modalities, CT was utilised in 92.2% of horses, radiography in 84.4%, and ultrasonography in 21.6%. Conclusions: The lack of clinical data in some reports. A risk of bias due to missing data. Conclusions: TMDs are infrequently described, with trauma being the most common TMD cause. TMDs are associated with TMJ dysfunction; however, the diagnostic protocol is varied. Regardless of the TMD type, a detailed diagnostic protocol should include a thorough history, detailed TMJ examination, and radiography as the first imaging choice in field practice, with CT as the 'gold standard' in clinical settings. For septic TMJ arthritis, a bacterial culture is recommended, while for primary TMJ OA, functional tests and local analgesia.
Publication Date: 2025-01-24 PubMed ID: 39861936DOI: 10.1111/evj.14462Google Scholar: Lookup
The Equine Research Bank provides access to a large database of publicly available scientific literature. Inclusion in the Research Bank does not imply endorsement of study methods or findings by Mad Barn.
  • Journal Article
  • Review

Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

The research article provides a systematic review of existing publications on equine temporomandibular joint diseases (TMDs), evaluating the prevalence of different types of TMDs, their causes, clinical signs, and diagnostic techniques.

Methods and Inclusion Criteria

  • The study was conducted following the PRISMA 2020 guidelines, which are a set of standards to ensure systematic reviews adhere to methodological rigor.
  • Literature searches were conducted in databases such as PUBMED, Scopus, and Web of Knowledge. The researchers included both case reports and research articles centered on equine TMDs.
  • The included studies were categorized based on the types of TMDs: septic TMJ arthritis, primary TMJ osteoarthritis, and non-arthritic TMDs.
  • To ensure the validity of the retrieved results, a risk of bias assessment was performed for the research articles.

Results and Findings

  • Among 51 publications, septic TMJ arthritis was identified as the leading TMD, accounting for 41.2% of TMD cases. Fractures/luxations accounted for 29.4% and primary TMJ osteoarthritis for 21.6%.
  • 54.9% of TMD cases had confirmed or suspected trauma as the underlying cause.
  • Among the diagnostic imaging modalities, Computed Tomography (CT) scans were the most frequently used (92.2% of cases), followed by radiography (84.4%) and ultrasonography (21.6%).
  • Clinical signs varied depending on the TMD type, but generally included swelling, pain, and masticatory problems. The severity of these signs was typically mild to moderate for primary TMJ OA, and ranged from mild to severe for septic TMJ arthritis and non-arthritic TMDs.

Conclusions

  • The researchers identified a lack of clinical data in some reports, warning of a potential risk of bias due to missing data. This could potentially limit the validity of the findings.
  • The study concluded that TMDs are not commonly described, but when they do occur, trauma is the most frequent cause. A careful diagnostic protocol should include a thorough history, detailed TMJ examination, and a stepwise approach to imaging – starting with radiography in the field and moving to CT in a clinical setting.
  • The researchers recommend bacterial culture for septic TMJ arthritis cases and functional tests and local analgesia for primary TMJ OA, signifying a need for a targeted approach based on the specific TMD type.

Cite This Article

APA
Jasiński T, Turek B, Kaczorowski M, Brehm W, Skierbiszewska K, Domino M. (2025). Equine temporomandibular joint diseases: A systematic review. Equine Vet J. https://doi.org/10.1111/evj.14462

Publication

ISSN: 2042-3306
NlmUniqueID: 0173320
Country: United States
Language: English

Researcher Affiliations

Jasiński, Tomasz
  • Department of Large Animal Diseases and Clinic, Institute of Veterinary Medicine, Warsaw University of Life Sciences (WULS - SGGW), Warsaw, Poland.
Turek, Bernard
  • Department of Large Animal Diseases and Clinic, Institute of Veterinary Medicine, Warsaw University of Life Sciences (WULS - SGGW), Warsaw, Poland.
Kaczorowski, Michał
  • Private Equine Practice, Grodzisk Mazowiecki, Poland.
Brehm, Walter
  • Department for Horses, Veterinary Teaching Hospital, University of Leipzig, Leipzig, Germany.
Skierbiszewska, Katarzyna
  • Department of Large Animal Diseases and Clinic, Institute of Veterinary Medicine, Warsaw University of Life Sciences (WULS - SGGW), Warsaw, Poland.
Domino, Małgorzata
  • Department of Large Animal Diseases and Clinic, Institute of Veterinary Medicine, Warsaw University of Life Sciences (WULS - SGGW), Warsaw, Poland.

Grant Funding

  • Science Development Fund of the Warsaw University of Life Sciences

References

This article includes 75 references
  1. Barber SM, Doige CE, Humphreys SG. Mandibular condylectomy technique and results in normal horses. Vet Surg 1985;14:79–86.
  2. Rodríguez MJ, Agut A, Gil F, Latorre R. Anatomy of the equine temporomandibular joint: study by gross dissection, vascular injection and section. Equine Vet J 2006;38:143–147.
  3. May KA, Moll HD, Howard RD, Pleasant RS, Gregg JM. Arthroscopic anatomy of the equine temporomandibular joint. Vet Surg 2001;30:564–571.
    doi: 10.1053/jvet.2001.28438google scholar: lookup
  4. Carmalt JL, Tucker ML. Arthroscopic approach and intra‐articular anatomy of the equine discomandibular joint compartment of the temporomandibular joint. Vet Surg 2020;49:1326–1333.
    doi: 10.1111/vsu.13487google scholar: lookup
  5. Balducci J, Ruby J, Hall C, Williams J. Arthrotomy, curettage and medical management of septic arthritis and osteomyelitis of the temporomandibular joint in a horse. Equine Vet Educ 2021;33:e5–e11.
    doi: 10.1111/eve.13156google scholar: lookup
  6. White SA, Carmalt JL, Schumacher J, Amitrano FN, Ortved K, Henry TJ. Long‐term outcome of horses undergoing unilateral mandibular condylectomy and meniscectomy for temporomandibular joint disease. Front Vet Sci 2022;9:898096.
  7. Pimentel KL, Carmalt JL. The frequency of communication between the synovial compartments of the equine temporomandibular joint: a contrast‐enhanced computed tomographic assessment. Front Vet Sci 2021;8:753983.
    doi: 10.3389/fvets.2021.753983google scholar: lookup
  8. Rosenstein DS, Bullock MF, Ocello PJ, Clayton HM. Arthrocentesis of the temporomandibular joint in adult horses. Am J Vet Res 2001;62:723–729.
    doi: 10.2460/ajvr.2001.62.729google scholar: lookup
  9. Nagy AD, Simhofer H. Mandibular condylectomy and meniscectomy for the treatment of septic temporomandibular joint arthritis in a horse. Vet Surg 2006;35:663–668.
  10. Frietman SK, van Proosdij ER, Veraa S, de Heer N, Ter Braake F. A minimally invasive partial condylectomy and temporal bone resection for the treatment of a suspected chronic synovial sepsis of the temporomandibular joint in a 3.5‐year‐old paint horse gelding. Vet Q 2018;38:118–124.
  11. Norvall A, Guerrero Cota J, Pusterla N, Cissell D. Ultrasound‐guided arthrocentesis of the temporomandibular joint in healthy adult horses is equivalent to blind arthrocentesis. Vet Radiol Ultrasound 2020;61:346–352.
    doi: 10.1111/vru.12836google scholar: lookup
  12. Kim CS, Reisbig NA, Carmalt JL. Contrast arthrography of the equine temporomandibular joint. Front Vet Sci 2024;11:1368131.
  13. Carmalt JL, Wilson DG. Arthroscopic treatment of temporomandibular joint sepsis in a horse. Vet Surg 2005;34:55–58.
  14. Lean NE, Young A, Ahern BJ. Fusobacterium necrophorum septic arthritis of the temporomandibular joint in an Australian Stockhorse mare. Equine Vet Educ 2021;33:e429–e432.
    doi: 10.1111/eve.13362google scholar: lookup
  15. Jørgensen E, Christophersen MT, Kristoffersen M, Puchalski S, Verwilghen D. Does temporomandibular joint pathology affect performance in an equine athlete?. Equine Vet Educ 2015;27:126–130.
    doi: 10.1111/eve.12268google scholar: lookup
  16. Smyth T, Allen AL, Carmalt JL. Clinically significant, nontraumatic, degenerative joint disease of the temporomandibular joints in a horse. Equine Vet Educ 2017;29:72–77.
    doi: 10.1111/eve.12382google scholar: lookup
  17. Carmalt JL, Reisbig NA. Arthroscopic treatment of bilateral mandibular condylar cysts and associated osteoarthritis of the temporomandibular joints in a horse. Equine Vet Educ 2022;34:e352–e358.
    doi: 10.1111/eve.13602google scholar: lookup
  18. Carmalt JL. Equine poor performance: the logical, progressive, diagnostic approach to determining the role of the temporomandibular joint. J Am Vet Med Assoc 2024;262:397–404.
    doi: 10.2460/javma.23.09.0513google scholar: lookup
  19. Adams K, Schulz‐Kornas E, Arzi B, Failing K, Vogelsberg J, Staszyk C. Functional anatomy of the equine temporomandibular joint: histological characteristics of the articular surfaces and underlying tissues. Vet J 2018;239:35–41.
  20. Bertone AL, Bramlage LR, McIlwraith CW, Malemud CL. Comparison of proteoglycan and collagen in articular cartilage of horses with naturally developing osteochondrosis and healing osteochondral fragments of experimentally induced fractures. Am J Vet Res 2005;66:1881–1890.
    doi: 10.2460/ajvr.2005.66.1881google scholar: lookup
  21. Adams K, Schulz‐Kornas E, Arzi B, Failing K, Vogelsberg J, Staszyk C. Functional anatomy of the equine temporomandibular joint: collagen fiber texture of the articular surfaces. Vet J 2016;217:58–64.
  22. Bonin SJ, Clayton HM, Lanovaz JL, Johnson TJ. Kinematics of the equine temporomandibular joint. Am J Vet Res 2006;67:423–428.
    doi: 10.2460/ajvr.67.3.423google scholar: lookup
  23. Pereira TP, Staut FT, Machado TS, Brossi PM, Baccarin RY, Michelotto PV. Effects of the oral examination on the equine temporomandibular joint. J Equine Vet Sci 2016;43:48–54.
  24. Bonin SJ, Clayton HM, Lanovaz JL, Johnston T. Comparison of mandibular motion in horses chewing hay and pellets. Equine Vet J 2007;39:258–262.
    doi: 10.2746/042516407x157792google scholar: lookup
  25. Smyth TT, Carmalt JL, Treen TT, Lanovaz JL. The effect of acute unilateral inflammation of the equine temporomandibular joint on the kinematics of mastication. Equine Vet J 2016;48:523–527.
    doi: 10.1111/evj.12452google scholar: lookup
  26. Weller R, Maierl J, Bowen IM, May SA, Liebich HG. The arthroscopic approach and intra‐articular anatomy of the equine temporomandibular joint. 2002;34:4–42.
  27. Reisbig NA, Pifko J, Lanovaz JL, Weishaupt MA, Carmalt JL. The effect of acute equine temporomandibular joint inflammation on response to rein‐tension and kinematics. Front Vet Sci 2023;10:1213423.
  28. Elzer EJ, Wulster KB, Richardson DW, Ortved KF. Standing arthroscopic treatment of temporomandibular joint sepsis in a horse. J Vet Dent 2020;37:94–99.
    doi: 10.1177/0898756420948269google scholar: lookup
  29. Sanders RE, Schumacher J, Brama PAJ, Zarelli M, Kearney CM. Mandibular condylectomy in a standing horse for treatment for osteoarthritis of the temporomandibular joint. Equine Vet Educ 2014;26:624–628.
    doi: 10.1111/eve.12235google scholar: lookup
  30. Luedke LK, Nixon AJ, Whitty JA, Irby NL, Ducharme NG. Bilateral rostral temporomandibular luxation with bilateral coronoid fracture in a Welsh pony. Vet Rec Case Rep 2020;8:e000785.
  31. Souza APA, Torres RVS, Oliveira CJ, Silva FWS, Franco FA, Florence CO. Reduction of temporomandibular joint (TMJ) luxation in a horse‐case report. Arq Bras Med Vet Zootec 2023;75:947–951.
    doi: 10.1590/1678-4162-12985google scholar: lookup
  32. Warmerdam EPL, Klein WR, Van Herpen BPJM. Infectious temporomandibular joint disease in the horse: computed tomographic diagnosis and treatment of two cases. Vet Rec 1997;141:172–174.
    doi: 10.1136/vr.141.7.172google scholar: lookup
  33. Weller R, Cauvin ER, Bowen IM, May SA. Comparison of radiography, scintigraphy and ultrasonography in the diagnosis of a case of temporomandibular joint arthropathy in a horse. Vet Rec 1999;144:377–379.
    doi: 10.1136/vr.144.14.377google scholar: lookup
  34. Devine DV, Moll HD, Bahr RJ. Fracture, luxation, and chronic septic arthritis of the temporomandibular joint in a juvenile horse. J Vet Dent 2005;22:96–99.
  35. Barnett TP, Powell SE, Head MJ, Marr CM, Steven WN, Payne RJ. Partial mandibular condylectomy and temporal bone resection for chronic, destructive, septic arthritis of the temporomandibular joint in a horse. Equine Vet Educ 2014;26:59–63.
    doi: 10.1111/eve.12053google scholar: lookup
  36. Manso‐Díaz G, García‐López JM, Maranda L, Taeymans O. The role of head computed tomography in equine practice. Equine Vet Educ 2015;27:136–145.
    doi: 10.1111/eve.12275google scholar: lookup
  37. Perrier M, Manso‐Díaz G, Dunkel B. Computed tomography findings in horses presented with signs of head‐shaking. Equine Vet J 2023;55:649–655.
    doi: 10.1111/evj.13889google scholar: lookup
  38. Pimentel KL, Allen AL, Carmalt JL. Developmental orthopaedic disease and early osteoarthritis of the temporomandibular joint in a 15‐month‐old Quarter Horse filly. Equine Vet Educ 2022;34:e203–e210.
    doi: 10.1111/eve.13578google scholar: lookup
  39. Stefanetti V, Beccati F, Passamonti F, Sgariglia E, Coletti M, Vuerich M. Detection and DNA quantification of Enterococcus casseliflavus in a foal with septic meningitis. J Am Vet Med Assoc 2016;249:96–100.
    doi: 10.2460/javma.249.1.96google scholar: lookup
  40. Crijns CP, Weller R, Vlaminck L, Verschooten F, Schauvliege S, Powell SE. Comparison between radiography and computed tomography for diagnosis of equine skull fractures. Equine Vet Educ 2019;31:543–550.
    doi: 10.1111/eve.12863google scholar: lookup
  41. Magri C, Schramme M, Nottrott K, Schweizer‐Gorgas D, Segard E, Kelly G. Coronoidectomy as a treatment for mandibular immobility caused by fracture of the coronoid process in three horses. Equine Vet Educ 2021;33:e331–e337.
    doi: 10.1111/eve.13396google scholar: lookup
  42. Perrier M, Schwarz T, Gonzalez O, Brounts S. Squamous cell carcinoma invading the right temporomandibular joint in a Belgian mare. Can Vet J 2010;51:885.
  43. Greim E, de Preux M, Koch C, Petruccione I, Klopfenstein Bregger MD, Van der Vekens E. Computer‐assisted removal of an ectopic tooth from the mandibular fossa through a mandibular condylectomy approach in a Comptois gelding. Equine Vet Educ 2023;35:e364–e361.
    doi: 10.1111/eve.13742google scholar: lookup
  44. Howell A, Panizzi L, Simpson E. Surgical treatment of a five‐structure dentigerous cyst in a Warmblood filly. Equine Vet Educ 2023;35:e372–e377.
    doi: 10.1111/eve.13746google scholar: lookup
  45. Carmalt JL. Equine temporomandibular joint (TMJ) disease: professional polarity and caregiver bias. Equine Vet Educ 2015;27:131–132.
    doi: 10.1111/eve.12286google scholar: lookup
  46. Witte TH. TMJ pathology: is it real?. Equine Vet Educ 2016;28:173–174.
    doi: 10.1111/eve.12340google scholar: lookup
  47. Moher D, Liberati A, Tetzlaff J, Altman DG PRISMA Group. Preferred reporting items for systematic reviews and meta‐analyses: the PRISMA statement. Ann Intern Med 2009;151:264–269.
  48. Ryan R, Synnot A, Prictor M, Hill S. Data extraction template for included studies. 2016 p. 1–25.
  49. . Evidence‐Based Medicine Ratings of the American Journal of Neuroradiology (AJNR). [cited 2024 Feb 19].
  50. . The Oxford levels of evidence 2. [cited 2024 Feb 19].
  51. Sterne JAC, Hernán MA, Reeves BC, Savovic J, Berkman ND, Viswanathan M. ROBINS‐I: a tool for assessing risk of bias in non‐randomized studies of interventions. BMJ 2016;355:355.
    doi: 10.1136/bmj.i4919google scholar: lookup
  52. Guerrero Cota JMG, Leale DM, Arzi B, Cissell DD. Regional and disease‐related differences in properties of the equine temporomandibular joint disc. J Biomech 2019;82:54–61.
  53. Carmalt JL, Kneissl S, Rawlinson JE, Zwick T, Zekas L, Ohlerth S. Computed tomographic appearance of the temporomandibular joint in 1018 asymptomatic horses: a multi‐institution study. Vet Radiol Ultrasound 2016;57:237–245.
    doi: 10.1111/vru.12334google scholar: lookup
  54. Smyth TT, Allen AL, Carmalt JL. Histologic assessment of age‐related changes in the temporomandibular joints of horses. Am J Vet Res 2019;80:1107–1113.
    doi: 10.2460/ajvr.80.12.1107google scholar: lookup
  55. Carmalt JL, Simhofer H, Bienert‐Zeit A, Rawlinson JE, Waldner CL. The association between oral examination findings and computed tomographic appearance of the equine temporomandibular joint. Equine Vet J 2017;49:780–783.
    doi: 10.1111/evj.12693google scholar: lookup
  56. Carmalt JL, Bell CD, Tatarniuk DM, Suri SS, Singh B, Waldner C. Comparison of the response to experimentally induced short‐term inflammation in the temporomandibular and metacarpophalangeal joints of horses. Am J Vet Res 2011;72:1586–1591.
    doi: 10.2460/ajvr.72.12.1586google scholar: lookup
  57. Steel C. Equine synovial fluid analysis. Vet Clin North Am Eq Pract 2008;24:437–454.
  58. Dumoulin M, Pille F, Van den Abeele A‐M, Haesebrouck F, Oosterlinck M, Gasthuys F. Evaluation of an automated blood culture system for the isolation of bacteria from equine synovial fluid. Vet J 2010;184:83–87.
  59. Omiunu A, Talmor G, Nguyen B, Vakil M, Barinsky GL, Paskhover B. Septic arthritis of the temporomandibular joint: a systematic review. JOMS 2021;79:1214–1229.
  60. Carmalt JL, Gordon JR, Allen AL. Temporomandibular joint cytokine profiles in the horse. J Vet Dent 2006;23:83–88.
    doi: 10.1177/08987564060230020google scholar: lookup
  61. Jasiński T, Turek B, Kaczorowski M, Brehm W, Skierbiszewska K, Bonecka J. Equine models of temporomandibular joint osteoarthritis: a review of feasibility, biomarkers, and molecular signaling. Biomedicines 2024a;12:542.
  62. Freemont AJ, Hoyland J. Lineage plasticity and cell biology of fibrocartilage and hyaline cartilage: its significance in cartilage repair and replacement. Eur. J. Radiol. 2006;57:32–36.
  63. Rodriguez MJ, Soler M, Latorre R, Gil F, Agut A. Ultrasonographic anatomy of the temporomandibular joint in healthy pure‐bred Spanish horses. Vet Radiol Ultrasound 2007;48:149–154.
  64. Rodríguez MJ, Latorre R, Lopez‐Albors O, Soler M, Aguirre C, Vázquez J. Computed tomographic anatomy of the temporomandibular joint in the young horse. Equine Vet J 2008;40:566–571.
    doi: 10.2746/042516408x322166google scholar: lookup
  65. Rodríguez MJ, Agut A, Soler M, Lopez‐Albors O, Arredondo J, Querol M. Magnetic resonance imaging of the equine temporomandibular joint anatomy. Equine Vet J 2010;42:200–207.
  66. Drees R, Perrier M, Vetter JR, Brounts S, Schwarz T. Magnification radiography in the horse to blur out superimposed structures. Wien Tierärztl Mschr 2011;98:160–165.
  67. Ramzan PHL, Marr CM, Meehan J, Thompson A. Novel oblique radiographic projection of the temporomandibular articulation of horses. Vet Rec 2008;162:714–716.
    doi: 10.1136/vr.162.22.714google scholar: lookup
  68. Ebling AJ, McKnight AL, Seiler G, Kircher PR. A complementary radiographic projection of the equine temporomandibular joint. Vet Radiol Ultrasound 2009;50:385–391.
  69. Townsend NB, Cotton JC, Barakzai SZ. A tangential radiographic projection for investigation of the equine temporomandibular joint. Vet Surg 2009;38:601–606.
  70. Baratt RM. Dental radiography and radiographic signs of equine dental disease. Vet Clin Equine Pract 2020;36:445–476.
  71. Manso‐Díaz G, Taeymans O, García‐López JM, Weller R. Application and indications of magnetic resonance imaging and computed tomography of the equine head. Equine Vet Educ 2021;33:31–46.
    doi: 10.1111/eve.13075google scholar: lookup
  72. Brounts SH, Henry T, Lund JR, Whitton RC, Ergun DL, Muir P. Use of a novel helical fan beam imaging system for computed tomography of the head and neck in sedated standing horses: 120 cases (2019–2020). JAVMA 2022;260:1361–1368.
    doi: 10.2460/javma.21.10.0471google scholar: lookup
  73. Stieger‐Vanegas SM, Hanna AL. The role of computed tomography in imaging non‐neurologic disorders of the head in equine patients. Front Vet Sci 2022;9:798216.
    doi: 10.3389/fvets.2022.798216google scholar: lookup
  74. Jasiński T, Zdrojkowski Ł, Turek B, Kaczorowski M, Pawliński B, Brehm W. Accuracy of computed tomography in diagnosing temporomandibular joint osteoarthritis relative to histopathological findings – an ex–vivo study of 41 horses. bioRxiv 2024b.
    doi: 10.1101/2024.11.01.621628google scholar: lookup
  75. Sterne JAC, Savovic J, Page MJ, Elbers RG, Blencowe NS, Boutron I. RoB 2: a revised tool for assessing risk of bias in randomised trials. BMJ 2019;366:l4898.
    doi: 10.1136/bmj.l4898google scholar: lookup

Citations

This article has been cited 0 times.