Instability after total hip arthroplasty

Figure 1 Anteroposterior pelvis radiograph of a 72-year-old female who sustained an anterior-superior dislocation of her left total hip arthroplasty approximately 1 mo after the index procedure (A) and the hip was reduced closed and found to be stable (B). Note the excessive anteversion of the acetabular component which is the likely etiology of the anterior dislocation.