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No effect of continuous passive motion after arthroplasty of the knee
Nielsen PT, Rechnagel K, Nielsen S-E
Acta Orthopaedica Scandinavica 1988;59(5):580-581
clinical trial
5/10 [Eligibility criteria: No; Random allocation: Yes; Concealed allocation: No; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: Yes; Adequate follow-up: Yes; Intention-to-treat analysis: No; Between-group comparisons: No; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

We randomly allocated 54 patients to active physical therapy only or this combined with 2 hours of passive knee motion twice daily from 2 to 12 days after total knee arthroplasty. The range of knee motion was measured on the 14th postoperative day. We found no difference between the groups. We concluded that 4 hours' passive motion daily in addition to early, active physical therapy does not improve the range of knee motion or promote mobilization after arthroplasty.

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