Perthes disease occurs when the upper portion of the thighbone (femoral head) begins to deteriorate due to a lack of blood supply. The femoral head can become brittle and collapse, leading to a bone deformity and often arthritis. What causes this disease is unknown, but it does occur more often in boys than girls.
- Pain in the knee or thigh
- Pain that develops slowly over time
- Loss of range of motion
- Difficulty walking
- Exercise and physical therapy