The key idea is using an outcome measure designed specifically to capture hand function in cervical spinal cord injury, including how the hand works in terms of strength, sensation, and prehension. GRASSP is built for this purpose in cervical SCI and covers all three areas in a coordinated way. GRASSP has three components that align with the patient’s needs: Sensibility, which assesses hand-related sensory function relevant to using the hand; Strength, which evaluates the key intrinsic and extrinsic hand muscles involved in grasp and dexterity; and Prehension, which looks at functional grasp patterns and the ability to perform different types of grip (lateral pinch, palmar pinch, tip pinch, etc.). The scoring is structured to track meaningful changes over time and it has established reliability and validity for people with cervical SCI, making it well-suited to evaluate comprehensive hand function in this population. The other measures don’t fit as specifically. The CUE Functioning Instrument targets upper-extremity function in a broader sense but isn’t designed specifically for the cervical SCI hand function triad of strength, sensation, and prehension. Handheld dynamometry measures force in individual muscles or grips but omits sensory assessment and functional prehension tasks. The Wheelchair User's Shoulder Pain Index focuses on shoulder pain and its impact on wheelchair use, not on hand function per se. So, GRASSP is the best choice for a cervical SCI patient needing a comprehensive evaluation of hand function across strength, sensation, and prehension.

The iliofemoral ligament, the Y-shaped band at the front of the hip, provides passive stability when the hip is extended. As the hip fully extends while standing with KAFOs, this anterior hip capsule ligament becomes taut and acts like a checkrein, limiting hyperextension and helping maintain an upright posture with little muscular effort. The other structures aren’t the primary source of hip stability in this position: the posterior cruciate ligament is in the knee, not the hip; the anterior longitudinal ligament runs along the spine and doesn’t stabilize the hip; and the iliotibial band is a lateral thigh structure that doesn’t serve as the main passive stabilizer for hip extension in standing.

The key idea is linking muscle actions to spinal nerve root levels (myotomes). Extensor hallucis longus does big toe extension, a function primarily supplied by the L5 nerve root. In clinical testing, big toe extension points to the L5 myotome, while ankle dorsiflexion (tibialis anterior) is mainly L4 and ankle plantarflexion (gastrocnemius) is mainly S1. So, for the action of extending the big toe, the correct myotome level is L5.

Increasing body weight support reduces the load that the legs must bear and move. With less vertical load and smaller joint moments to generate, the brain sends fewer commands to the lower-extremity muscles, so muscle activation measured during walking decreases. In body weight–supported treadmill training, more unloading typically leads to lower EMG activity in the major leg muscles as you practice stepping with less resistance. This trend holds across many individuals, though the exact amount of reduction can vary from person to person.