Tendonitis is amongst the most common overuse injury. Tendons are made of collagen. They attach muscles to bone and are subject to great deal of force. The vasculature of tendons varies with blood supply originating at both the musculo-tendinous and bone tendon junctions. Often times, the blood supply is insufficient for healing, and tears to the collagen lead to chronic pain in many athletes. Chronic tendinopathy can occur most commonly in the rotator cuff, extensor carpi radialis brevis, patellar and achilles tendons. Other tendons can include the adductor longus, biceps, tibialis posterior, and flexor hallucis longus tendons.



Bursitis - The body contains many bursae (fluid filled sacs) situated between the bony surfaces of overlying tendons. Their role is to facilitate movement of the tendon over the bony surface. Overuse injuries in bursae are quite common, particularly at the subacromial bursae, the greater trochanter, ischial bursae, and the bursae deep to the illiotibial band at the knee and the retrocalcaneal bursae. Bursitis is associated with local tenderness and swelling and pain with specific movements. Treatment involves NSAIDS, but this may be ineffective due to the poor blood supply of most bursae. Chronic bursitis will need to be injected with corticosteroids to reduce the inflammation.