The results of Charnley arthroplasty of hip performed for protrusio acetabuli.

The results of total hip replacement in protrusio acetabuli using the Charnley technique have been very satisfactory. The immediate and late complications have been in no way different from those in ordinary cases of osteoarthritis and rheumatoid arthritis as performed in this hospital. There was no difference in the successful results whether a bone graft or cement alone had been used, and nothing to suggest that wire mesh need be used even in the severe cases. The diagnosis of idiopathic protrusio is 4 times more frequent than that of secondary protrusio. There was an incidence of 10 females for every male suffering from protrusio acetabuli. About half of the patients required bilateral low friction arthroplasties.