Spontaneous dissociation in total hip revision arthroplasty at the femoral head–neck interface

Modular designs of hip prosthesis have become increasingly popular in recent years. In several studies, modular head components have been reported to have many advantages, but few complications related to modularity of the femoral component were published. Dissociation of modular THA at the femoral head-neck interface is a rare condition and has been reported most often during attempts of closed reduction of dislocated total hip arthroplasties. We report the case of late detachment of a modular femoral component after revision arthroplasty of the hip and several closed reductions due to recurrent dislocation.