No definite proof. Acupuncture has its place in orthopedic medicine, but I am not aware of any quality medical study that demonstrates that acupuncture results in more rapid healing of tendons and ligaments. I typically consider referring patients for acupuncture in my practice when traditional treatment measures have not resulted in optimal results. Your physician can help you determine what treatment is best.
Probably. It is certainly possile but would likely require repeated treatments. Ligaments may not heal themselves well due to poor blood supply and remain less strong as compared to prior to the injury. This may result in looseness in the joint , chronic pain, and susceptibility to more injury. In these cases, prolotherapy or prp injections can also be useful especially when precisely guided by ultrasound.