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Value of continuous passive motion in total knee arthroplasty
S A Wasilewski1, L C Woods, W R Torgerson
1Department of Orthopedic Surgery, Lahey Clinic Medical Center, Burlington, Mass. 01805.
Orthopedics
|March 1, 1990
Summary
Continuous passive motion (CPM) aids rehabilitation after total knee arthroplasty, reducing complications and hospital stays. While initial range of motion improves, long-term outcomes and knee scores are significantly better with CPM therapy.
Area of Science:
- Orthopedics
- Rehabilitation Medicine
- Biomedical Engineering
Background:
- Total knee arthroplasty (TKA) is a common procedure for end-stage knee osteoarthritis.
- Postoperative rehabilitation is crucial for optimizing functional recovery and patient outcomes.
- Conventional physiotherapy is the standard approach, but newer technologies are being explored.
Purpose of the Study:
- To compare the effectiveness of continuous passive motion (CPM) with conventional physiotherapy after TKA.
- To evaluate differences in complication rates, functional recovery, and patient-reported outcomes.
Main Methods:
- A comparative study involving 74 patients (91 TKAs) divided into two groups.
- One group received conventional physiotherapy (immobilization + active assisted range-of-motion exercises).
- The other group utilized a continuous passive motion machine immediately post-operation.
Main Results:
- The CPM group showed fewer complications, including wound healing issues and thromboembolic disease.
- Analgesic use was reduced, and straight leg raising was achieved slightly earlier in the CPM group.
- While immediate range of motion was greater with CPM, ultimate follow-up ranges were similar; however, knee-rating scores were significantly higher (9 points) in the CPM group, with a shorter hospital stay (2.1 days).
Conclusions:
- Continuous passive motion is an effective adjunct to conventional physiotherapy in the postoperative care of total knee arthroplasty patients.
- CPM therapy can lead to improved patient-reported outcomes and reduced healthcare resource utilization.
- Further research may explore optimal CPM protocols and long-term functional benefits.