One hundred knees that underwent primary total knee arthroplasties were divided into 2 groups: the first 50 consecutive knees were assigned retrospectively to Group I (control), and the following 50 knees were assigned prospectively to Group II (early flexion). All procedures were cementless meniscal-bearing total knee arthroplasties and were performed by the same surgeon. Maximum early flexion (Group II) resulted in decreased length of stay, decreased hospital costs, and increased range of motion at 1 year. In light of current government interest in hospital cost reduction, this method should be considered as an attractive alternative to continuous passive motion.
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