What are some complications of carpal tunnel surgery?

Hopefully nothing: This is fairly routine, superficial surgery and complications are rare. It is theoretically possible to cause damage to surrounding nerves or blood vessels in addition to usual risks (infection, poor wound healing, etc), but these are rare.

Many but not common: Infection, bleeding, scarring, pain, numbness, tendon injury, muscle atrophy, nerve injury, wound separation, incomplete release and more.

Not common: The success rate for carpal tunnel release to treat cts is very high. However, complications can occur. The most common complications are wound healing issues, infection, delayed bleeding , and nerve injury.