Tendons act as bridging and attachment structures for the muscles to bone; some tendons are long and therefore prone to injury, especially because they are often loaded to the extreme and are only minimally capable of elastic elongation. A prime example is the superficial flexor tendon of horses, which is frequently injured by partial tearing that leads to tendinitis. Another acquired injury of tendons involves traumatic disruptions by internal forces or by external trauma. Healing of tendons and ligaments is prolonged, and the resultant repair tissue is usually of inferior mechanical strength compared to the original, healthy tendon. Newer treatment modalities (eg, stem cell injection, platelet-rich plasma, extracorporeal shock wave therapy) combined with specific rehabilitation programs have improved the prognosis for recovery from tendon and ligament disorders and return of animals to soundness for their intended use.