Causes of Upper Limb Pain II

Ulnar Nerve Entrapment at the Wrist (Guyon’s canal)

The ulnar nerve provides sensation to the ring finger, little finger, and the part of the palm of your hand connected to those fingers. It also controls most of the muscles in the hand.
The nerve passes through Guyon’s canal, which is located on the side of your palm near its border with the wrist.
When the ulnar nerve is entrapped or compressed within this canal, you will have the same type of numbness, tingling and pain in your hand and fingers as in carpal tunnel syndrome, except that the location would be in the ring and little fingers. Later on there may also be weakness in the hand muscles.
The pressure on the nerve is also caused by swelling and entrapment of the ulnar nerve within Guyon’s canal.
Again, this is a repetitive strain injury that occurs because the tissues in Guyon’s canal swell up. This type of injury can also make it very difficult for you to push your wheelchair or move from one surface to another.

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