A polyethylene liner dissociation case report in depuy pinnacle cup. An impingement problem?

The modular components facilitate joint replacement surgery but are associated with potential complications not present in the previous components. We present a case of polyethylene dissociation due to rupture of the anti-rotational blocks in a total hip prosthesis two years after surgery. We think about the possible causes and risk factors. Despite its low incidence, the dissociation between polyethylene and the acetabular cup is a catastrophic complication. The femoroacetabular impingement seems to play a key role.