Fig. 2
From: Ten-year survival rate after rotational acetabular osteotomy in adulthood hip dysplasia
Kaplan-Meier survival analysis of rotational acetabular osteotomy for total hip arthroplasty (THA) requirement and osteoarthritis (OA) progression in the patients older than 41 years (older age group) and younger than 41 years (younger age group). The younger age group had significantly better THA-free survival rate (a) and OA progression rate (b) than the older age group during the 10-year follow-up (numbers at risk = 65 hips in the younger and older age groups) (Log-rank test, p < 0.01 and 0.03, respectively)