Dual mobility (tripolar) cup versus Constrained acetabular cup in management of dislocated total hip arthroplasty

Abstract

Dislocation after total hip arthroplasty is the second most common problematic complication after cup loosening. There are many factors that affect prosthesis instability including patient related factors as: gender (increases with females), age (increases with elderly), body characteristics (height), it increase with hip fractures, previous hip surgery and neuromuscular disorders. Related to surgical technique as component orientation, soft tissue tension and trochanteric non union. Related to implant design as head size, neck design, head size ratio, femoral offset and acetabular liner design. Options for hip dislocation includes closed reduction and