Hip impingement can occur from deformities of the femur (cam impingement), acetabulum (pincer impingement), or as a result of a combination of the two abnormalities. 

Cam impingement is caused by a squeezing or jamming of an abnormally shaped femoral head and head-neck junction into the acetabulum (socket) during certain types of motion, such as tying one's shoe, or riding a bike.

Pincer impingement is caused by direct contact between the femoral head-neck junction and a section of the acetabular rim.

Impingement of the hip can also be caused by conditions such as Legg-Calve-Perthes disease, slipped capital femoral epiphysis, misshapen femoral head, abnormally tilted head, a bump on the femoral neck, or post traumatic deformities, such as Coxa Vara.

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