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Table 4 Joint flexibility tests and references from typically developing controls attained in other studies

From: Exercise intervention protocol in children and young adults with cerebral palsy: the effects of strength, flexibility and gait training on physical performance, neuromuscular mechanisms and cardiometabolic risk factors (EXECP)

Reference Values and Diagnostic
Modified Thomas test
 Hip measurement 1: Hip angle > 0° = short and/or stiff one-joint hip flexors (i.e. iliopsoas, hip adductors).
 Hip measurement 2 (examiner applies hip extension torque): Hip angle > 0° = short one-joint hip flexors.
 Hip measurement 3: Reference value = 0° (i.e. ASIS and patella aligned on the sagittal plane). Positive values = short and/or stiff hip abductors.
 Knee measurement 1: Knee angle < 67° = short and/or stiff two-joint hip flexors (i.e. rectus femoris, tensor fascia latae, sartorius).
 Knee measurement 2 (supported hip): Knee angle < 67° = short and/or stiff two-joint hip flexors.
 Note: Tightness of the anterior capsule and ligaments may also influence the test.
 References: [72, 97,98,99]
Passive knee extension test
 Knee angle > 40° (with the hip at 90°) = short hamstring muscles.
 References: [100, 101]
Passive ankle dorsiflexion test
 Ankle angle < 18° with knee at 0° and 90° = short Soleus muscle.
 Ankle angle < 18° with knee at 0° and ankle angle > 18° with knee at 90° = short Gastrocnemius muscle.
 Ankle angle > 18° in with knee in 0° and 90° = good triceps surae flexibility.
 References: [102, 103].
  1. ASIS anterior superior iliac spine. Hip measurements 1–2: 0° = anatomical position, positive values = hip flexion. Knee measurements: 0° = knee in full extension. Ankle measurements: 0° = sole of the foot at right angles to the tibial axis, positive values = dorsiflexion
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