Ultra-Short Anatomic and Conventional Cementless Stems Cementless Stems in Patients Younger Than Fifty-Five Years Old

"1. Simultaneous bilateral sequential total hip arthroplasties under the same anesthetic.~2. Randomization to treatment with an ultra-short or a convnetional cementless stem was accomplished with use of study numbers in sealed envelope, which were opened in the operating room before the skin incision was made.~3. The pore size was 250㎛. A 28-mm-diameter Biolox forte ceramic femoral head (CeramTec AG, Polchingen, Germany) ) was used in all hips. A cementless cup and a 28mm internal-diameter Biolox forte ceramic liner was used in all hips in both groups."