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patient force target measurement system weight target load pedar insole weight-bearing drift study feedback difference device pedar system loading group hospital condition pwb training pressure period ground reaction force hurkman training amount peak load arm muscle strength rehabil method therapist platform sensor measure accuracy result ground subject technique percentage table trochanteric osteotomy postoperative reaction error value scale transducer analysis observation anxiety increase validity kistler feedback group experiment reliability orthop biomechanic correction h.l.p control group rehabilitation frequency plate fracture hip arthroplasty 3 conditions muscle session strength bussmann jb characteristic performance ground reaction forces number control insole pressure system osteotomy