This seems to be a case of arthrogryposis
, a picture may give better clue. Botox
seems to be unrewarding if bony deformities coexist. Splints with oral muscle relaxants for a month may help improv therapy.
If the nerve
conduction is defective then all is useless.
Ps: often orthopedic surgeons are reluctant for tendon transfers if muscle is degenerate.