Execution
- 1Position the patient supine.
- 2Flex the hips and knees and let the knees fall outward into a frog-leg posture.
- 3Compare tibial rotation, joint line position, and posterior-lateral knee contour bilaterally.
- 4Apply gentle stress only within comfort.
- 5Record posterior-lateral pain, instability, or asymmetry.
Positive outcome
Posterolateral pain, abnormal tibial external rotation, or asymmetrical instability in the frog-leg posture is abnormal. The test is intended as a posterolateral corner or rotatory instability screen. It is not a high-evidence stand-alone diagnostic test.
CommentThe frog-leg test is less commonly cited than the dial or reverse pivot-shift test. I kept it as a conservative Magee-style posterolateral assessment because modern diagnostic literature is limited. Use stronger PLC tests first.
Low Clinical Value