TMJ Pain: Causes, Diagnosis, and When Surgery Is Needed

What Is the TMJ?

The temporomandibular joint (TMJ) is the hinge joint connecting the lower jaw (mandible) to the skull, located just in front of each ear. It is one of the most complex joints in the body — it allows opening and closing, side-to-side movement, and forward-backward movement. Between the mandibular condyle and the temporal bone sits an articular disc (meniscus) that cushions the joint.

Temporomandibular disorders (TMDs) is the collective term for a group of conditions affecting the TMJ and the muscles of mastication. They are common — estimated to affect 5–12% of the population — and occur more frequently in women aged 20–40.

Symptoms of TMJ Disorder

• Pain or tenderness over the joint (in front of the ear), particularly on chewing
• Clicking, popping, or grating sounds when opening or closing the jaw
• Limited mouth opening (less than 35–40 mm is considered restricted)
• Locking of the jaw — open or closed (unable to fully open or fully close)
• Facial pain, temple headache, or ear pain
• Bite change — feeling that the teeth do not meet correctly
• Jaw fatigue on chewing

What Causes TMJ Disorders?

TMJ disorders rarely have a single cause. Contributing factors include:

• Disc displacement — the articular disc slips out of its normal position, causing clicking (with reduction) or limited opening (without reduction)
• Bruxism (teeth grinding/clenching) — overloads the joint and muscles of mastication, causing pain and wearing of joint surfaces
• Trauma — a blow to the jaw, condylar fracture, or whiplash can damage the joint or disc
• Arthritis — osteoarthritis and rheumatoid arthritis can affect the TMJ, leading to joint surface degeneration
• TMJ ankylosis — fibrosis or bone formation in the joint, often following a childhood condylar fracture, causing severe restriction or complete inability to open the mouth
• Stress and muscle hyperactivity — psychological stress leads to increased jaw clenching and muscle tension

Diagnosis

Dr. Chatterjee will evaluate TMJ complaints with a combination of clinical examination and imaging. Clinical assessment includes measuring mouth opening, joint palpation, assessment of clicking or crepitus, and evaluation of bite. Imaging — OPG for bone architecture, MRI for disc position and soft tissue, CT scan for bony changes or ankylosis — is selected based on the clinical findings.

Conservative Treatment (First Line)

The majority of TMJ disorders respond well to non-surgical management:

When Is Surgery Needed?

Surgery is considered when conservative management has failed after an adequate trial (typically 3–6 months), or when there is a specific structural problem that cannot be addressed non-surgically:

• TMJ ankylosis — surgical release is necessary to restore mouth opening. Complete bony ankylosis requires gap arthroplasty or total joint replacement.
• Severe condylar resorption or degenerative joint disease — when joint surfaces are destroyed and conservative measures no longer provide adequate function.
• Disc displacement with chronic closed lock — unresolved locked jaw that has not responded to manipulation and conservative care may be treated with arthroscopy or open joint surgery.
• Condylar hyperplasia — abnormal overgrowth of the condyle causing progressive facial asymmetry and bite change.

Total TMJ Joint Replacement

For end-stage TMJ disease — particularly bilateral ankylosis, severe degenerative disease, or failed previous joint surgery — total alloplastic TMJ joint replacement provides a complete solution. The damaged condyle and glenoid fossa are replaced with prosthetic components (titanium fossa component and cobalt-chrome condyle), restoring anatomy and movement. Dr. Chatterjee performs total TMJ replacement at Asha Nursing Home, Rampurhat — a procedure previously accessible only in major city hospitals.