The present study examined the short-term results of cementless total hip arthroplasty (THA) using SUMMIT stems. We treated 30 patients during the period between May 2009 and May 2010. The average age of the patients at the time of surgery was 68 years, and the average postoperative follow-up period was 16 months. There was no early stem subsidence after surgery. The average Japanese Orthopaedic Association hip scores increased from a preoperative mean of 42 to a mean of 93 at one year after surgery. No complications occurred. Of the 30 hips, 20 (66%) showed roentgenographic signs of stem osseointegration at one year. Stress shielding occurred in 17 hips (59%), but was not progressive. These short-term data indicate that the SUMMIT stem is capable of delivering good results.
