Whilst the femoral head is soft it is vulnerable to becoming misshapen. The acetabulum (socket) is unaffected by the condition and will act as a ‘mould’ to contain the femoral head. If a good range of movement can be maintained the head should remain spherical. Physiotherapy is very important in overcoming muscle spasm and encouraging movement. This is the mainstay of treatment for most patients. At times, particularly in the first 6-12 months the hip can be quite painful. This might mean that periods of a week or two of rest are required. In rare instances bed rest with traction on the leg are indicated. Most children should not play sport during the earlier stages of the disease although swimming should be encouraged.