EFFECT OF FEMORAL OFFSET ON RANGE OF MOTION AND ABDUCTOR MUSCLE STRENGTH AFTER TOTAL HIP-ARTHROPLASTY

At a minimum of one year after operation, we studied 64 patients with 86 total hip arthroplasties (THA) by standard anteroposterior hip and pelvic radiographs and measurement of range of motion and of isometric abduction strength. The femoral offset correlated positively with the range of abduction (p=0.046). Abduction strength correlated positivel y with both femoral offset (p=0.0001) and the length of the abductor l ever arm (p=0.005). Using multiple regression, abduction strength corr elated,vith height (p=0.017), gender (p=0.0005), range of flexion (p=0 .047) and the abductor lever arm (p=0.060). Our findings suggest that greater femoral offset after THA allows both an increased range of abd uction and greater abductor strength.