After surgery or injury to the lower leg, it is vital that comprehensive physiotherapy is undertaken so that the patient regains full mobility. This is especially the case with patients who have undergone hip or knee replacement surgery. There are a great deal of leg exercises capable of working all the major muscle groups and strengthening the legs, but many of these need to be performed with the aid of a trained physiotherapist and can cause additional injury if not performed correctly. Such exercises can also help to prevent Deep Vein Thromboses (DVTs) and other related problems.