Mark J McElroy, Aaron J Johnson, Michael G Zywiel and Michael A Mont
Expert Rev. Med. Devices 8(1), 57–65 (2011)
Persistent pain and dysfunction following total knee arthroplasty require treatment beyond standard rehabilitation. This article discusses devices used to prevent and treat decreased range of motion. If deficits remain after initial standard therapy, multiple devices exist that can be used for nonoperative treatment. Load-control devices apply a constant force, producing variable soft-tissue displacement as tissues stretch. Static progressive stretch devices use the principle of stress relaxation by applying progressively increasing constant displacements. Both types of devices are reported to be effective in treating persistent knee stiffness. The authors feel that future developments will occur in improving treatment protocols for these devices.
..."Using CPM led to shorter hospital stays by a difference of approximately 1 day (95% CI: 0.03–1.35 days, based on 382 patients), improved active knee flexion at 2-week follow-up by a mean of 4.3° (95% CI: 2.0–6.6°, based on 286 patients) and lowered the incidence of postoperative manipulation by a relative risk of 0.12 (95% CI: 0.03–0.53, based on three trials). "...
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