Phenotype details |
onset infancy/childhood; MRC muscle strength neck neck flexors 3-, neck extensors 4; MRC muscle strength upper limbs generalised weakness upper extremities 4–4+; MRC muscle strength lower limbs hip flexion 4 on right, 3 on left, hip adductors 4-, hip abduction 5, knee flexion/extension 5, ankle dorsiflexion 3+ on right, 0 on left, plantar flexion 5; no facial weakness; calf pseudohypertrophy; no scoliosis; no contractures, joint laxity; forced vital capacity normal; no sleep apnoea; no cognitive impairment; no cardiac involvement; EMG myopathic; normal CK level |