Superiority of sonographic evaluation of contracted versus relaxed muscle thickness in motor neuron diseases

To compare the correlations of relaxed and contracted limb muscle thickness with clinical scales in patients with amyotrophic lateral sclerosis (ALS) and spinal muscular atrophy (SMA). Patients with ALS and SMA were prospectively recruited from December 2018 to November 2019. All patients underwent clinical assessment and sonographic muscle thickness measurement of eight relaxed muscles (biceps brachii, abductor pollicis brevis (APB), first...