Outcome measures
All patients were examined by X-ray and CT within 14 days before surgery. One day before the operation, the planning for the cTHA group was based on X-ray measurements of the size and position of the prosthesis and the length of the lower extremities. The length was determined by drawing a horizontal reference line through bilateral tears and measuring the distance from the vertex of the surgical and contralateral lesser trochanter to the horizontal reference line (Fig. Presenting the process of calculating the length of both lower limbs. A. Bilateral tear drop line; B. Distance from the left lesser trochanter to the tear drop line; C. Distance from the right lesser trochanter to the tear drop line