90-90 Straight Leg Raise Test | Active Knee Extension Test | Hamstring Length

The 90-90 Straight Leg Raise Test also known under the name of Active Knee Extension Test (AKET) is a test to assess hamstring length and the presence of possible hamstring contracture.

Neto et al. (2015) have evaluated this tests intra-rater reliability and found a good intra-rater ICC of 0.91. They concluded that the Active Knee Extension Test has an excellent intra-rater reliability and a small detectable difference of 7-8°.

1) Patient is in supine position with the hips and knees flexed to 90° and the lumbar spine in neutral position

2) The patient is then asked to stabilize this position by grabbing onto the back of thethighs

3) The patient actively extends the knee on the side to be tested, while his lumbar spine remains in neutral position

21 OF THE MOST USEFUL ORTHOPAEDIC TESTS IN CLINICAL PRACTICE

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Other common tests to assess hamstring length are:

• Backsaver-Sit-and-Reach-Test
• Tripod Sign

Neto T, Jacobsohn L, Carita AI, Oliveira R. Reliability of the active-knee-extension and straight-leg-raise tests in subjects with flexibility deficits. Journal of sport rehabilitation. 2015 Nov 1;24(4).