Avascular Necrosis of Bone in Patients with Uveitis Treated with Systemic Corticosteroids.

PURPOSE

To identify the prevalence, risk factors and outcomes of avascular necrosis (AVN) in patients with chronic uveitis.

METHODS

A retrospective study of patients with corticosteroid-induced AVN treated at Manchester Uveitis Clinic between 1991 and 2019.

RESULTS

From a cohort of 4478 patients, 1698 had been treated with systemic corticosteroids. Five patients with AVN were identified (prevalence 0.29%). The mean age at diagnosis of AVN was 49 years. All 5 patients were using systemic immunosuppression. Four patients developed femoral head AVN in 7 joints, one had bilateral knee osteonecrosis. The mean duration of corticosteroid before AVN was 38 months; the mean dose at onset was 17mg/day and the mean cumulative dose was 18,860mg. Three patients required total hip replacements but management was conservative for others. There was no permanent disability.

CONCLUSIONS

AVN is a rare but severe complication of corticosteroid therapy. Clinicians should be vigilant for symptoms of bone pain as early detection and cessation of corticosteroids can reverse incipient AVN and avoid surgery.