Mismatched F-Wave Data with Clinical Findings in a Patient with Cerebrovascular Disease

We introduce a 67-year-old male patient with right hemiparesis and cerebral hemorrhage undergoing physical therapy. He did not move the affected fingers, especially the thumb. According to the clinical findings, MAS (modified Ashworth Scale) of the thenar muscles was 2 and the arm tendon reflex was normal. To investigate the excitability of spinal neural function, we tested the F-wave of the right thenar muscles after stimulating the right median nerve in the wrist at rest. This patient has hyper tonus but normal tendon reflexes with a normal F/M amplitude ratio. These results suggest that the cause may be the secondary dysfunction because of the shortening of the thenar muscles and not a neurologic factor.