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A physical therapist assess a patient's left hamstrings length by administering the 90-90 straight leg raising test. The therapist begins the testing procedure by positioning the patient in supine with the hips and knees flexed to 90 degrees. What is the next step when performing this test?1.Instruct the patient to actively extend the left knee2.Instruct the patient to actively extend the left knee while flexing the left hip3.Passively extend the left knee until slight resistance is felt4.Passively extend the left knee while flexing the left hip until slight resistance is felt
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