Survival rate of the femoral stem in patients with total hip arthroplasty is closely related with the femoral canal type classified with canal flare index.OBJECTIVE:
To study the canal flare index distribution in the patients with different ages and in the patients with total hip arthroplasty treated for femoral neck fracture, femoral head necrosis or osteoarthritis.METHODS:
The retrospective evaluation of the X-ray film of the proximal femur was performed on 100 patients with total hip arthroplasty. The canal flare index was measured and compared among the age groups and common three diseases.RESULTS AND CONCLUSION:
The canal flare index was 3.82±1.20 in the group aged < 50 years, 3.46±0.99 in the group aged between 50 and 59 years, 3.28±0.75 in the group aged between 60 and 69 years, 2.95±0.69 in the group aged between 70 and 79 years, and 2.94±0.59 in the group aged ≥ 80 years. The canal flare index was 2.74±0.53 in femoral neck fracture group, 3.45±1.04 in the group of femoral head necrosis and 3.50±0.69 in the osteoarthritis group. The canal flare index is helpful to the preoperative selection of the prosthesis in total hip arthroplasty.