37 cementless CO-10 total hip replacements were clinically and radiographically evaluated, with a minimum follow-up of 60 months. 23 cups were found to be fixed and 14 presented signs of loosening. Nine patients (26%) with an obviously fixed cup presented some degree of pain, a symptom also referred by ten patients (36%) with signs of cup loosening, but in this latter group pain varied from mild (5/10) to moderate (3/10) and severe (2/10). Interestingly, four patients with a loose cup had no pain at all. The authors concluded that pain is not a symptom present in the majority of the patients with a loose threaded CO-10 cup and that a significant number of patients with fixed cups can present pain.
Arthroplasty; Replacement; Hip; Prosthesis Failure; Pain
