TY - JOUR AU - Kinkel, S; Wollmerstedt, N; Kleinhans, J A; Hendrich, C; Heisel, C TI - Patient activity after total hip arthroplasty declines with advancing age JO - Clin Orthop Relat Res IS - 8 VL - 467 PY - 2009 DO - 10.1007/s11999-009-0756-3 SP - 2053 EP - 2058 ER -