Table 1.

Summary table for polyethylene liner dissociation after reverse shoulder arthroplasty (RSA) dislocation.

Etiology	Dissociation of polyethylene component after reverse shoulder arthroplasty dislocation
Incidence	Dislocation incidence as high as 4.7%, rate of polyethylene dissociation for this case series is 15.4% of all dislocations, or 0.7% of all RSA
Gender ratio	No determinant
Age predilection	Unknown
Risk factors	Intraoperative soft-tissue tensioning, age, history of prior instability events, asymmetric liner wear, mechanical liner failure, axillary nerve injury causing deltoid weakness, impingement due to heterotopic ossification, traumatic events
Treatment	Open reduction and revision of components as needed, without attempt at closed reduction
Prognosis	Resolution after revision surgery
Findings on imaging	Appearance of a subluxation of prosthesis rather than a complete dislocation with near 100% to greater than 100% displacement