90 90 straight leg raise test purpose is to assess:

90 90 straight leg raise test purpose is to assess:

• A. To measure knee extensor strength.
• B. To assess hamstring muscle length.
• C. To evaluate hip joint range of motion.
• D. To test ankle dorsiflexion.

Answer: (B)

The test is used to assess hamstring muscle length. By keeping the hip flexed at 90 degrees and the knee at 90, then extending the knee, the hamstrings are placed on stretch. How far the knee can straighten reflects how long the hamstrings are: full, near-full extension means adequate hamstring length, while limited extension indicates tight hamstrings. This isn’t a measure of knee extensor strength (that would involve resisting a force on the quadriceps), nor is it a direct measure of hip joint range of motion or ankle dorsiflexion.

The test is used to assess hamstring muscle length. By keeping the hip flexed at 90 degrees and the knee at 90, then extending the knee, the hamstrings are placed on stretch. How far the knee can straighten reflects how long the hamstrings are: full, near-full extension means adequate hamstring length, while limited extension indicates tight hamstrings. This isn’t a measure of knee extensor strength (that would involve resisting a force on the quadriceps), nor is it a direct measure of hip joint range of motion or ankle dorsiflexion.