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Clinical Application of Temporomandibular Joint Structure

Original Editor - Micaela Weinberg

Top Contributors - Ewa Jaraczewska, Jess Bell and Tarina van der Stockt  

Introduction

The temporomandibular joint (TMJ) has several essential functions, including chewing, speaking and biting.[1] The TMJ's complex functions influence the variety and nature of pathologies that can develop. The two temporomandibular joints work as a pair. They have fibrocartilaginous articulating surfaces, and each contains an articular disc.

Understanding the anatomical and biomechanical relationships within the TMJ allows clinicians to interpret clinical presentations and develop targeted treatment approaches. This page covers TMJ assessment, identification of painful areas, analysis of mechanical dysfunction and compensatory patterns, and treatment options.

Bilateral Considerations

When a patient presents with unilateral symptoms, the contralateral TMJ is generally involved in the pathology to varying degrees. Because the TMJs move as a pair, the contralateral side can play either a causative or compensatory role and needs to be incorporated into the assessment and treatment.[2] The joint that appears asymptomatic may actually be the primary cause of dysfunction, with the symptomatic side becoming painful as a compensatory consequence. This relationship means that unilateral treatment approaches may be incomplete and ineffective.

For example, assessment may reveal that a patient with right-sided jaw pain has a compressed and overloaded right TMJ. However, this compression often develops due to altered mechanics on the contralateral side (in this case, the left side), such as excessive mobility. This left-sided hypermobility may cause the patient to develop a habitual rightward jaw deviation during function. The right side compensates by working harder, becoming tighter, and eventually becoming symptomatic. Treating the right side alone may provide only temporary relief as the altered mechanics have not been addressed.[3]

Capsular Dysfunction

Inflammation of the TMJ commonly results from mechanical overload, trauma, parafunctional habits, or degenerative processes.[4]

For example, excessive clenching and grinding drive the mandibular condyle superiorly into the mandibular fossa, creating compression forces beyond what the joint can typically sustain. This compression leads to capsulitis, where the joint capsule becomes inflamed, thickened, and adherent. Because the capsule is highly innervated, it becomes a significant source of pain.[3]

Capsulitis causes localised joint pain, restricted mouth opening, and often a sensation of joint stiffness or tightness.[5] Patients may describe that their jaw feels "stiff" or that opening their mouth fully requires excessive effort. Palpation reveals tenderness directly over the joint space, and there may be limitations in range of motion. Patients often compensate for restricted range with increased upper cervical extension/flexion. Patients may report increased tenderness when distracting the joint for the first time, followed by relief as compression releases.[3]

Joint Space Pathology

Asymmetrical joint space tightness between the mandibular condyle and temporal bone creates additional clinical problems.[6] [7] When one joint space becomes more restricted than the other, the jaw begins to deviate toward the tighter side during movement.[8] This deviation becomes habitual, with patients unconsciously talking, chewing, and maintaining their resting jaw position with this lateral shift. Over time, this pattern is reinforced through muscular adaptation and further capsular tightening, creating a cycle that progressively worsens if left untreated.

Disc Displacement

The position and movement of the articular disc may contribute to TMJ pathology. The disc should move with the mandibular condyle during jaw movements, with the intermediate zone maintaining contact between the condyle and fossa/articular tubercle. However, when the superior lateral pterygoid muscle becomes overactive or develops increased tone, it pulls the disc anteriorly out of its normal resting position.[9] This anterior disc displacement creates the characteristic clicking or popping sounds that many patients experience.[10] Clicking occurs as the mandibular condyle moves under the posteriorly displaced disc during mouth opening.[11] This happens when the condyle makes contact with the articular disc. During mouth closure, the disc moves anteriorly to the condyle, sometimes producing a reciprocal click. While many patients with clicking jaws function without pain, the presence of clicking indicates abnormal disc mechanics that can progress to more significant pathology.

Retrodiscal Tissue

The pain associated with disc displacement does not typically originate from the disc itself, as it is poorly innervated and centrally avascular. Pain originates from the highly innervated retrodiscal tissue that becomes trapped and compressed when the disc is anteriorly displaced.[12] The retrodiscal tissue, composed of nerves, blood vessels, fatty tissue, and connective tissue, becomes impinged between the mandibular condyle and temporal bone when the disc is displaced. This impingement causes sharp, localised pain in the joint region that may be constant or occur with specific jaw movements.

As disc displacement progresses, the condition can evolve into a "locked jaw" or an anterior disc displacement without reduction, where the disc remains anteriorly displaced, and the mandibular condyle can no longer translate forward over the disc during mouth opening.[13] The patient experiences a sudden or gradual limitation of mouth opening, often opening only 25 to 30 millimetres instead of the normal 40 to 50 millimetres.[14] This presentation requires immediate intervention to prevent permanent disc deformation and chronic limitation.[15]

Pathology of the TMJ Ligaments

The lateral ligament prevents posterior dislocation, which is particularly relevant in trauma cases or for patients with hypermobility.[16] When this ligament becomes strained or lax, the joint loses its posterior stability, potentially allowing the mandibular condyle to translate too far posteriorly. This posterior movement can compress the retrodiscal tissue and create pain similar to disc displacement, but because the mechanical cause differs, it requires different treatment approaches.

The stylomandibular and sphenomandibular ligaments provide medial stability and limit excessive anterior translation. These ligaments create fascial connections between the cranium and mandible, extending the influence of TMJ dysfunction beyond the local joint. The sphenomandibular ligament inserts into the lingula. This provides a potential pathway through which temporomandibular dysfunction can affect the sphenoid bone and related structures, possibly contributing to headache patterns and sinus symptoms. The stylomandibular ligament originates at the styloid process, demonstrating the connection between the cranium, upper cervical spine, and TMJ, and inserts onto the angle of the mandible.

The oto-mandibular ligaments are the discomalleolar ligament (DML) and the anterior malleolar ligament (AML). Research suggests that temporomandibular disorders may stretch the DML and AML, thereby disrupting the middle ear's equilibrium.[17] Patients with temporomandibular dysfunction frequently report tinnitus, ear fullness, or otalgia without identifiable ear pathology. While the exact mechanism remains debated, the proximity of the external auditory meatus to the TMJ and the presence of these ligamentous connections suggest a possible mechanical relationship, which is supported by clinical experience.[18]

Assessment and Treatment of the TMJ

Tightness in the joint space can cause signs and symptoms like headaches, TMJ pain and reduced range of mouth opening. The ultimate goal is to achieve symmetry and equal joint space on both sides.[3]

Protraction with Specific Soft Tissue Mobilisations

Protraction with specific soft-tissue mobilisations is an assessment and treatment technique that targets the joint capsule, ligaments, and retrodiscal tissue. It is effective for pain, limited range of motion, or inflammation.

Key steps and considerations:[3]

  1. Patient position: The patient brings their lower jaw forward (protraction). It is crucial to move the mandibular condyle out of the way to allow access to the joint space.
  2. Assessment and treatment: This technique serves both as an assessment and a treatment.
  3. Caution: This is a sensitive area and an invasive technique. Caution is required, and the therapist needs to provide a clear explanation of the technique to the patient.
  4. Hand placement: The clinician's thumbs rest on the superior surface of the patient's back teeth, and the index finger is positioned with the pad (not the nail) facing toward the clinician.
  5. Execution: The clinician applies a slight pressure inwards and moves their index finger slowly and rhythmically, in a controlled manner, up and down within the joint space, targeting the lower and upper compartments.
  6. Comparison: Both sides must be compared to assess for symmetry, differences in joint space (e.g., increased on one side, restricted on the other), and potential jaw shifting.
  7. Clinical reasoning: The depth and force of the pressure applied depend on the patient's condition (e.g., inflammation, acute stage). Assess the patient's reaction and their SIN (Severity, Irritability, Nature) to determine how much pressure to apply.
  8. Patient breaks: Breaks are necessary during assessment and treatment, especially to allow the patient to swallow and to ensure they are tolerating the technique.
  9. Feeling: With practice, clinicians learn to distinguish between normal joint space, inflammation, fibrosis, and adhesions.

This optional video demonstrates self-mobilisation protraction techniques for the TMJ:

[19]

Temporomandibular Joint Mobilisation and Distraction

Temporomandibular joint mobilisation and distraction aim to increase joint space, reduce inflammation, and address stiffness or adhesions.

Key techniques and principles:[3]

  1. Distractions (in sitting):
    • Involves pulling the mandibular condyle down away from the fossa, counteracting clenching.
    • The clinician places their thumbs on the superior surface of the patient's back teeth and their index fingers on the joint spaces.
    • The clinician uses a squat (or lunge) position for leverage and instructs the patient to keep their head still and not to allow their head to move backwards.
    • Amplitude variations: larger amplitude movements are applied for acute pain or grade IV oscillation for stiffness. Caution is advised for hypermobility.
    • This technique is helpful for patients with "locked jaw" to increase their range of motion.
  2. Distraction with lateral glides (in sitting):
    • The clinician places their fingers on the superior surface of the patient's back teeth and their index fingers on the joints to apply slight distraction, and asks the patient to actively move their lower jaw side to side.
    • This technique helps improve mobility, reduce pain, and enhance proprioception. Slower movement is encouraged to demand muscle control.
    • Note that tremors during movement can indicate weakness on one side.
  3. Protraction (in supine):
    • Performed with the patient lying supine with their head supported.
    • The clinician places their thumbs below the patient's front teeth (on the gum) and pulls the jaw up toward the sky to create space in the TMJs.
    • The supine position tends to be better tolerated by patients than sitting techniques, as it is less invasive. However, the sitting position may be preferred for its functional relevance.
  4. TMJ mobilisations (in side-lying):
    • The patient lies on the opposite side to the joint being mobilised (e.g., on the left side to mobilise the right TMJ).
    • The clinician places their pisiform on the patient's TMJ and the ulnar side of their hand along the mandible.
    • The clinician directs the pressure in an angular motion towards the bed, not in a purely inferior direction.
    • This technique is helpful for tightness, range-of-motion issues, or if the jaw is rotated to one side.

This optional video shows a TMJ distraction technique in supine:

[20]

Resources

References

  1. ↑ Bordoni B, Brizuela M. Anatomy, Head and Neck, Temporomandibular Joint. [Updated 2025 Sep 8]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan-. Available from https://www.ncbi.nlm.nih.gov/books/NBK538486/
  2. ↑ Lövgren A, Visscher CM, Alstergren P, Lobbezoo F, Häggman-Henrikson B, Wänman A. The outcome of a temporomandibular joint compression test for the diagnosis of arthralgia is confounded by concurrent myalgia. Clinical Oral Investigations. 2020 Jan;24(1):97-102.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Weinberg M. Clinical Application of TMJ Anatomy and Biomechanics. Plus course 2025
  4. ↑ Luca IM, Earar K, Chiuariu TM, Dobri VS, Trifautanu P, Ilie M, Stefanescu A, Roberto-Adrian D, Vladimir B, Ludmila V, Dimofte AR. Non-Steroidal Anti-Inflammatory Agents in Temporomandibular Joint Disorders: Current Evidence and Therapeutic Perspectives. Romanian Journal of Medical and Dental Education. 2025 May;14(3).
  5. ↑ Or S, Yücetas S. Posterior capsulitis of the temporomandibular joint. Int J Oral Maxillofac Surg. 1986 Jun;15(3):307-12.
  6. ↑ Meyer RA. The Temporomandibular Joint Examination. In: Walker HK, Hall WD, Hurst JW, editors. Clinical Methods: The History, Physical, and Laboratory Examinations. 3rd edition. Boston: Butterworths; 1990. Chapter 163.
  7. ↑ Bae SJ, Yong HS, Lee H, Kim HS, Huh JK, Kim JY. Changes of temporomandibular joint space volume during 1 year after transoral vertical ramus osteotomy in patients with mandibular asymmetry. Scientific Reports. 2025 Jan 24;15(1):3102.
  8. ↑ López, D. F., Giraldo, N. G., Borrás, V. R., Muñoz, J. M. & Flores-Mir, C. Volumetric differences in temporomandibular joint components in patients with facial asymmetry: a 3D tomographic segmentation study. In Seminars in Orthodontics, vol. 30, 346–354 (Elsevier, 2024).
  9. ↑ Cai XY, Jin JM, Yang C. Changes in disc position, disc length, and condylar height in the temporomandibular joint with anterior disc displacement: a longitudinal retrospective magnetic resonance imaging study. Journal of Oral and Maxillofacial Surgery. 2011 Nov 1;69(11):e340-6.
  10. ↑ Larheim TA, Hol C, Løseth G, Arvidsson LZ. Temporomandibular joint pathologies: pictorial review. Br J Radiol. 2024 Jan 23;97(1153):53-67.
  11. ↑ Mehndiratta A, Kumar J, Manchanda A, Singh I, Mohanty S, Seth N, Gautam R. Painful clicking jaw: a pictorial review of internal derangement of the temporomandibular joint. Polish journal of radiology. 2019 Dec 23;84:598-615.
  12. ↑ Teng H, Sun T, Shu J, Shao B, Liu Z. Effect of Various Degrees of Anterior Disc Displacement on the Biomechanical Response of the Masticatory System. Journal of Biomechanical Engineering. 2025 Apr 1;147(4):041006.
  13. ↑ Ying J, Gao J, Gao L, Guo J. Anterior Disc Displacement of Temporomandibular Joint: Imaging Diagnosis and Multidisciplinary Treatment. International Journal of General Medicine. 2025 Dec 31:5557-68.
  14. ↑ Shivananda S, Doddawad VG, Anand A, Gopi A, Anupama C, Bhuyan L. Evaluation of normal range of mouth opening using three-finger index and its impact on age, gender, and body mass index of an individual. Journal of Head & Neck Physicians and Surgeons. 2024 Jan 1;12(1):38-43.
  15. ↑ Yoshida K. Long-standing temporomandibular joint dislocation: a comprehensive review and proposal of a treatment algorithm. Medicina. 2025 Aug 22;61(9):1505.
  16. ↑ Shorey CW, Campbell JH. Dislocation of the temporomandibular joint. Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology. 2000 Jun 1;89(6):662-8.
  17. ↑ Ramírez, LM; Ballesteros, ALE; Sandoval, OGP. A direct anatomical study of the morphology and functionality of disco-malleolar and anterior malleolar ligaments. Int. J. Morphol., 27(2):367-379, 2009.
  18. ↑ Hasan B. Temporomandibular Joint Disorders in Otology: The Anatomical Ear-TMJ Connection [Internet]. Temporomandibular Joint Disorders - New Perspectives in Diagnosis and Treatment [Working Title]. IntechOpen; 2025. Available from http://dx.doi.org/10.5772/intechopen.1011695
  19. ↑ Vital Performance Physical Therapy. TMJ Protraction Mobilization. Available from: https://www.youtube.com/watch?i8XMGUCpNF4 [last accessed 19/11/2025]
  20. ↑ Allied Physical Therapy. TMJ Distraction. Available from: https://www.youtube.com/watch?N4Go8bVOf7A [last accessed 19/11/2025]
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