Abstract
Objective To evaluate a self-designed novel progressive stretching device (PSD) for stiff knee in an animal experiment. Methods An animal model of left stiff knee was created in 3 adult goats. The PSD was used to put the left stiff knee in gradual traction for 3 weeks (4 times per day and 2 to 4mm per time) before it was removed. The maximum flexion degrees of the left knee were recorded before traction, the day of removal of the PSD and one week after removal of the PSD. Results The maximum flexion degrees of the]eft knee before traction, the day of removal and one week after removal of the PSD were 9. 0°± 3. 6°, 112. 2°± 17.7° and 110. 1 °± 15.5 °, respectively. No significant loss of the maximum flexion was observed one week after removal of the PSD. After 3 weeks of treatment with PSD, the maximum flexion degree of the left knee was significantly improved, with a mean correction of 103.2°. Conclusion The self-designed PSD may be used for treatment of stiff knee in clinical practice. Key words: External fixator; Knee joint; Animal experimentation; Progressive stretch device
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