Hip impingement is usually without symptoms for many years. After a long time, it causes stiffness and pain in the groin or front of the thigh. FAI can also prevent individuals from flexing their hip beyond 90 degrees. Pain usually increases after prolong sitting, running or jumping. The condition, left untreated, can lead to osteoarthritis in the hip.
Causes and Risk Factors
FAI is caused by deformities in the femur, hip socket or a combination of both. The condition may begin at birth (congenital) or may develop as a child grows (acquired). The condition appears to be caused by a combination of genetic and environmental factors. Some researchers believe that the risk of FAI is increased by significant athletic activity before a child's bones are mature and that contact sports may make hip impingement worse.