Effect of Opposite Leg Position on Hamstring Flexibility in Patients With Mechanical Low Back Pain

"The active knee extension test has been proposed as the gold standard for assessment of hamstring flexibility, as it utilizes readily available equipment and offers a quick, reliable, and low-cost alternative for measurement of hamstring flexibility (Connor et al; 2015).~* The subject will be instructed to maintain 90° hip flexion in the supine position.~* Then asked to actively extend the knee joint.~* The degree of achieving active knee extension will be measured using a universal goniometer.~* The average of three active knee extension measurements will be used as the hamstring muscle length for the data analysis (Dong-Kyu Lee, et al; 2018).~ * the procedures will be done with opposite-leg flexed, then repeated with opposite-leg extended."