Already had radial nerve decompression in arms. still when i grip or grip for long, my hands go into spasms snd fingers contort.why still?

Neuromuscular: Dystonia is an abnormal movement disorder described a slow movement, tonic, like a spasm that may result in abnormal posturing of a limb, neck or torso. Paramyotonia is an abnormal inability to relax a muscle after forceful contraction is applied. Muscle cramps can occur as sign of prior injury to a nerve leading to that muscle. Consult with your physician to help you sort this out.