What hip flexion angle is used in the 90-90 straight leg raise test?

What hip flexion angle is used in the 90-90 straight leg raise test?

• A. 60 degrees
• B. 45 degrees
• C. 90 degrees
• D. 120 degrees

Answer: (C)

This test evaluates hamstring flexibility by positioning the hip at a right angle. With the thigh at a right angle to the trunk, extending the knee is limited mainly by the length of the hamstrings, not by the hip flexors or other structures. Keeping the hip in this 90-degree position isolates the hamstrings so you can gauge their length accurately. If the hip were placed at a different angle, other muscles could limit knee extension and confound the result. That’s why the setup uses a hip flexion to a right angle.

This test evaluates hamstring flexibility by positioning the hip at a right angle. With the thigh at a right angle to the trunk, extending the knee is limited mainly by the length of the hamstrings, not by the hip flexors or other structures. Keeping the hip in this 90-degree position isolates the hamstrings so you can gauge their length accurately. If the hip were placed at a different angle, other muscles could limit knee extension and confound the result. That’s why the setup uses a hip flexion to a right angle.