An ischial apophysis avulsion is an injury to the sitting bone where the hamstring muscle meets the bony protrusion of the sitting bone or ischial tuberosity. An avulsion is an injury in which movement or injury results in a violent and sudden contraction of the hamstring which pulls a piece of the sitting bone with it. This injury typically affects young athletes, aged 13 to 25 years. Symptoms include ischial tuberosity pain, swelling and pain in the thigh area, muscle spasms, and muscle weakness in the legs. To heal the injury, extended rest and massage are typically in order as well as stretching exercises and gait work.
• Spinal stenosis. Literally meaning "spinal narrowing," spinal stenosis can occur when changes in arthritis lead to bony overgrowth of the vertebrae and thickening of the ligaments. This can occur with osteoarthritis or ankylosing spondylitis. If a significant overgrowth occurs, it can cause the spinal column to narrow and press on the nerves housed within. Because the affected nerves have many functions, the condition may cause diverse problems in the lower body, including back pain, pain or numbness in the legs, constipation or urinary incontinence.
Grade II (moderate): A larger tear in your muscle that makes it difficult to move and causes a moderate amount of pain, especially when you move the affected muscle, swelling, and tenderness. You may have 5 percent to 50 percent loss of function and you may be limping. You can't go back to sporting activities until the tear is completely healed. These injuries can take anywhere from a couple weeks to a few months to heal, depending on how bad they are.