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The effect of knee position on blood loss and range of motion following total knee arthroplasty . PURPOSE This study prospectively assessed the effects of knee position on blood loss and range of motion after primary total knee arthroplasty ( TKA ) . METHODS One hundred and ten consecutive TKA patients were randomized into flexion group and extension group . Both groups had the leg elevated 30° at the hip over an inactive CPM for 72 h postoperatively . The flexion group had the knee flexed to 30° during this period . The extension group had the knee extended fully . Perioperative blood loss , hidden blood loss , knee swelling , ecchymosis , analgesia requirements , range of motion ( ROM ) , fixed flexion deformity ( FFD ) , straight-leg raising action , and postoperative complications within 6 weeks of surgery were measured for evaluation and comparison . RESULTS The postoperative hidden blood loss , knee swelling , and scope of ecchymosis were significantly lower in the flexion group than in the extension group , and ROM and straight-leg raising action were significantly higher during the early period after operation . No significant difference was observed in perioperative blood loss , the amount of morphine used , or FFD in the early postoperative period or in ROM and FFD at 6 weeks postoperatively . CONCLUSIONS The findings of this study indicate that flexion of the knee to 30° with the leg elevated 30° at the hip after total knee arthroplasty may mitigate knee swelling and provide other beneficial results during the early rehabilitation following TKA . LEVEL OF EVIDENCE Prospective comparative study , Level I .
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Intervention_Physical
knee position
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Intervention_Physical
knee position
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Outcome_Physical
blood loss
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Outcome_Physical
range of motion
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Outcome_Physical
blood loss
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Outcome_Physical
range of motion