Patients will be tested at two visits separated by 1-21 days. At each visit, the patients would undergo bilateral lower extremity strength assessment by two physical therapists, independently and in the same order. Testing would include: hip flexion, knee extension, knee flexion, ankle dorsiflexion Testing performed with 1) HHD (three trials recording maximum voluntary force) and 2) manual muscle testing (MMT), British Medical Research Council grade 0-5)
