Intra- and postoperative assessment of femoral component rotation in total knee arthroplasty: an EKA knee expert group clinical review - Skowronek, P; Arnold, M; Starke, C; Bartyzel, A; Moser, L B; Hirschmann, M T; European Knee Associates (EKA) (Knee Surg Sports Traumatol Arthrosc, 2021)