Which flexibility test tests the hamstrings with the knee at 90 degrees?

Which flexibility test tests the hamstrings with the knee at 90 degrees?

• A. 90/90 HS Test
• B. Thomas Test
• C. Ely Test
• D. Posterior Sag

Answer: (A)

The main idea is testing hamstring length with the knee positioned at 90 degrees. In the 90/90 hamstring test, you have the patient supine with the hip at 90 degrees of flexion and the knee at 90 degrees. The knee is then straightened toward full extension while keeping the hip from moving. How far the knee can extend reflects the hamstrings’ length across the knee joint. If you can reach near full extension, the hamstrings are sufficiently flexible; if extension is limited or the pelvis moves to compensate, it indicates hamstring tightness or contracture. The other tests target different structures: the Thomas test assesses hip flexor length; the Ely test checks rectus femoris flexibility; the posterior sag test evaluates PCL stability rather than hamstring length.

The main idea is testing hamstring length with the knee positioned at 90 degrees. In the 90/90 hamstring test, you have the patient supine with the hip at 90 degrees of flexion and the knee at 90 degrees. The knee is then straightened toward full extension while keeping the hip from moving. How far the knee can extend reflects the hamstrings’ length across the knee joint. If you can reach near full extension, the hamstrings are sufficiently flexible; if extension is limited or the pelvis moves to compensate, it indicates hamstring tightness or contracture. The other tests target different structures: the Thomas test assesses hip flexor length; the Ely test checks rectus femoris flexibility; the posterior sag test evaluates PCL stability rather than hamstring length.