According to your description, the wound has just healed. At present, it can't be said that there must be something wrong with the nerve or tendon, and there is a great possibility of scar contracture, so surgery is not needed for the time being. At present, strengthening functional exercise is expected to resume. The specific method is to pull at any time every day, like pulling ligaments, step by step. 3-6 months before considering whether to operate. Physical therapy can be supplemented during traction. Even if it is an operation, if it is not too long, it is estimated that satisfactory results can be achieved.