The radiographic study and clinical significance of femoral offset

Objective To investage the range of femoral offset and explore its clinical significance.Methods 100 cases of normal anteroposterior hip joints radiographic image were measured.Parameters included femoral offset,abductor lever arm,body weight lever arm,femoral head diameter,neck-shaft angle,the width of bone medullary cavity at the plane of lesser trochanter,20 mm above and below the lesser trochanter,diameter of the narrow cavity and canal flare index(CFI).The correlation between femoral offset and other anatomical parameters in femur were explored by simple correlation analysis.The proximal femoral parameters between Chinese and the Western were compared.Results The range of femoral offset was(36.64±5.31)mm.Femoral offset and abductor lever arm was positively correlated(r=0.73,P0.01).Femoral offset was negatively correlated neck-shaft angle(r=-0.46,P0.01).There were no significance correlation between femoral offset and other anatomical parameters in femur.There was a significant difference in the diameter of the femoral head,neck-shaft angle,femoral offset,abductor lever arm between men and women(P 0.05).There was a significant difference in neck-shaft angle,femoral offset between Chinese and the Western(P0.01).Conclusions The range of femoral offset was(36.64±5.31) mm.Restoration of femoral offset can recover the length of abductor lever arm and restore the biomechanics of the hip.