Eminoplasty and Condylotomy for Refractory Temporomandibular Internal Derangement

Most patients with clicking, locking and jaw pain improve with reassurance, soft diet, splint therapy and physical measures. A minority do not, and their imaging shows a displaced disc with degenerative change, a shortened condyle or a persistent closed lock. For that group, two operations compet...

Most patients with clicking, locking and jaw pain improve with reassurance, soft diet, splint therapy and physical measures. A minority do not, and their imaging shows a displaced disc with degenerative change, a shortened condyle or a persistent closed lock. For that group, two operations compete: eminoplasty, which reshapes the articular eminence to remove the obstruction to translation, and condylotomy, which shortens the condylar neck to unload the joint. The choice depends on staging, on the state of the disc and on what the surgeon intends to change.

Internal Derangement and Wilkes Staging

Internal derangement describes an abnormal relationship between the disc and the condyle, ranging from anterior displacement that reduces on opening to displacement without reduction and perforation. Wilkes staging classifies the progression: early stages show slight displacement with reducing click and no bony change; intermediate stages show persistent displacement, pain and early remodeling; late stages show perforation, adhesions, osteophyte formation and crepitus. The stage, not the duration of symptoms, determines which operation is reasonable.

When Conservative Care Fails

Failure is defined by persistent pain or limitation after an adequate trial of reversible therapy, typically three to six months. Imaging with magnetic resonance defines disc position, and computed tomography defines the bony contour of the eminence and the condyle. Patients with significant psychosocial distress, sleep disturbance or widespread pain often do poorly after any operation, and identifying them before surgery prevents disappointment.

Imaging should be interpreted alongside the clinical range of movement, because a displaced disc on magnetic resonance is a common incidental finding in asymptomatic volunteers. The decision to operate rests on concordance between symptoms, examination and imaging, not on the image alone.

Arthrocentesis as the Bridge

Arthrocentesis with lavage and injection of hyaluronic acid or a corticosteroid is minimally invasive and effective in a substantial proportion of patients with closed lock or inflammatory pain. It is the appropriate next step when splint therapy fails, and many patients never require an open procedure. A positive response to lavage predicts a favorable response to more definitive surgery, whereas repeated failure suggests that the mechanical problem lies in the disc or the eminence.

Wilkes stage also guides the extent of surgery. Early intermediate disease with a reducing disc may respond to arthroscopic lysis and lavage, while late disease with perforation and crepitus rarely benefits from disc-preserving procedures. Staging therefore prevents an operation that cannot deliver the intended result.

Eminoplasty

Technique

Eminoplasty reduces the height and the posterior slope of the articular eminence, usually through an intraoral approach or an endoscopically assisted route. Removing the obstruction allows the condyle to translate further and reduces the compressive load on the retrodiscal tissue. It is often combined with disc repositioning, synovectomy or arthroscopic lysis of adhesions.

Selection and outcomes

The best candidates have a mechanical limitation to opening, an intact disc and no generalized degenerative disease. Eminoplasty reliably improves maximal opening and reduces the frequency of locking, but it does not restore a perforated disc or reverse osteoarthritic change. Complications include temporary restriction from scarring, damage to the auriculotemporal nerve and, rarely, excessive resection that destabilizes the joint.

Condylotomy

Mechanism

Condylotomy divides the condylar neck and allows the condyle to settle into a new position, which enlarges the joint space and reduces loading on the disc and the retrodiscal tissues. Because the fragments are not rigidly fixed, the condyle finds its own position during healing. The procedure can be performed extraorally or through an intraoral approach with a reciprocating saw under imaging control.

Indications and risks

It is favored for patients with a displaced disc without reduction, degenerative change and a desire to avoid open joint surgery. Reported outcomes include reduced pain and improved opening in the majority of selected patients. Risks include malocclusion from excessive condylar sag, infection, damage to the facial nerve with the extraoral route, and nonunion. Careful preoperative occlusal assessment and controlled ostectomy reduce the danger of an anterior open bite.

Occlusal stability deserves particular attention before condylotomy. Patients with a full complement of posterior teeth and a stable occlusion tolerate condylar repositioning better than those with missing support, in whom even a small sag can produce an anterior open bite that is difficult to correct.

Choosing Between Them

Eminoplasty addresses an obstruction and is therefore a mechanical solution for a mechanical problem; condylotomy addresses loading and is better suited to a joint that is painful and degenerating. Age, dentition, the state of the disc, previous surgery and the patient's tolerance for a possible occlusal change all enter the decision. Some surgeons combine the procedures, though the added morbidity requires justification.

Both procedures are followed by a period of guarded function, and imaging confirms the position of the segments after condylotomy. Persistent pain beyond three months should prompt reassessment rather than a further operation, because central and psychosocial factors often dominate at that stage.

Postoperative Rehabilitation

Early mobilization protects the range achieved, and a soft diet with gradual return to normal function is preferred to prolonged immobilization. Physical therapy, jaw exercises and occlusal review at each visit consolidate the result. Imaging after condylotomy confirms the position of the fragments once healing is underway.

Oral Hygiene After Surgery

Any operation that limits opening for weeks creates stagnation in the posterior segments, and plaque accumulating there threatens both the teeth and the surgical site. Chlorhexidine rinses are useful in the first days, but mechanical cleaning remains essential. A pressure-sensing electric toothbrush such as the BrushO helps patients clean the molar regions with soft bristles and controlled force while opening is still limited, and its timer supports a complete routine when access is awkward.

Conclusion

Eminoplasty and condylotomy answer different questions about the same joint. Eminoplasty removes a mechanical obstruction and improves translation; condylotomy unloads a painful, degenerating joint and relies on adaptive healing. Wilkes staging, disc status on magnetic resonance imaging and a genuine trial of conservative care determine which is appropriate, and honest counselling about occlusal risk is as important as the technique itself.