Kahlenberg CA, et al. - From 1982 to 2007, data for 108 hips in 82 cases were assessed to study the causes of revision in young subjects vs older population undergoing total hip arthroplasty (THA). They observed avascular necrosis, juvenile idiopathic arthritis, developmental dysplasia of the hip, and post-traumatic arthritis, most frequent preoperative diagnoses. They also recorded the most common causes for revision including acetabular loosening (30.1%), femoral loosening (23.7%), and polyethylene wear (24.7%). They noticed 8.3% of subjects experiencing primary THA with highly cross-linked polyethylene and the rest of the patients underwent THA when conventional polyethylene was used. They reported no statistically significant relationship between the component(s) revised and initial fixation ie, cemented or uncemented prosthesis.