My son has just had a cast removed after 7 weeks after fracturing his scaphoid his thumb is total numb and in pain?

SCAPHOID FRACTURE. Tenderness with palpation of the anatomical snuffbox. Avascular necrosis is a common complication and can cause degenerative arthritis of the affected wrist.
Digital nerves. Could well be secondary to injury to digital nerves, and less likely a more proximal median nerve problem. Typically in a child, recovery of nerve fnctn is rapid, perhaps within 4-6 weeks. Let your doctor know of the problem, but these issues are usually short-term with good outcomes.

Related Questions

My son has just had a cast removed after 7 weeks after fracturing his scaphoid his thumb is total numb and in pain. How can I fix this?

Therapy. Therapy is probably all that is needed for just thumb numbness. If any other fingers are numb he should be checked for carpal tunnel syndrome. Read more...
Depends. Numbness after cast removal is not uncommon, but should improve within several days now that the compression from the cast is removed. Pain may be from either stiffness associated with the immobilization, or perhaps from the fracture site itself. If that doesn't improve within the week then he needs to be reevaluated to differentiate between these two options. Read more...