Prospective mid-term results of a consecutive series of a short stem.

A large number of short stem prostheses for hip -arthroplasty have been introduced in the past years. Although there is a large increase of publications about short stems, there is still little data available about survival and revision rates. We report prospectively on the outcome of 84 consecutive NANOS® short stem prostheses in 81 patients. We have included 37 female patients and 44 male patients with an average age of 61.6 ± 9.2 years. The main diagnoses were osteoarthritis in 67 patients, dysplastic osteoarthritis in 8 patients and avascular necrosis of the femoral head in 6 patients. Along with demographic data and co-morbidities, the Harris Hip Score was recorded preoperatively and at follow-up. The Harris Hip Score increased from 36.6 ± 14.5 preoperatively to 94.5 ± 8.8 at the final follow-up. During the main follow-up time (27.7 months ± 5.7) none of the 84 stems were revised, intraoperatively three fissure fractures occurred.