Hello Faisal, treatment depends on several factors including the severity of the injury, the type of injury, the length of time since the injury, and other existing conditions. And since you have mentioned it's been 10 years, so the reason is nerve tissue grows slowly, so it can take several years to know the full benefit of surgery.

Further, there are various surgeries we have mentioned below:

Nerve graft: In this procedure, the damaged part of the brachial plexus is removed and replaced with sections of nerves harvested from other parts of your body. This helps restore your arm's function.

Nerve transfer: When the nerve root has been torn from the spinal cord, surgeons often take a less important nerve that's still working and connect it to a nerve that's more important but not working.

Muscle transfer: Muscle transfer is a procedure in which your surgeon removes a less important muscle or tendon from another part of your body, typically the thigh, transfers it to your arm, and reconnects the nerves and blood vessels supplying the muscle. 

For your convenience, we have prepared a list - Best Orthopedists in India.

Hope this answer helps you.