Execution
- 1Seat the patient on the edge of the table with both knees flexed to 90 degrees.
- 2Passively extend one knee while the patient remains seated.
- 3Watch the trunk, pelvis, and opposite limb during knee extension.
- 4Return the leg to the start position and repeat the test on the other side.
- 5Compare knee extension range and trunk compensation side to side.
Positive outcome
The test is positive when the patient extends the trunk or leans backward to relieve hamstring tension as the knee is extended. The finding indicates hamstring tightness. Posterior leg pain or paresthesia should raise consideration of neural involvement rather than simple muscle length limitation.
CommentMagee describes the tripod sign as a seated hamstring contracture test. It is quick and functional, but trunk compensation can occur for reasons other than hamstring shortening. Use it as a screening sign and confirm with controlled length testing if needed.
Low Clinical Value