Femoroacetabular impingement - cam-type

Case contributed by Samir Benoudina
Diagnosis certain


Painful hip movements bilaterally.

Patient Data

Age: 30 years
Gender: Male

Osseous bump at the femoral head-neck junctions, and short femoral neck bilaterally; giving the pistol grip deformity appearance. 

Features consistent with bilateral femoroacetabular impingement, cam type.

Annotated image

Pistol-grip deformity (Arrows) with epiphyseal scar (Yellow dotted line)  which extends lateral to a best fit circle of the femoral head also known as “horizontal growth plate sign" seen in cam femoroacetabular impingement.

Case Discussion

Femoroacetabular impingement is characterized by abnormal contact between the proximal femur and rim of the acetabulum. It affects typically healthy, active adults, between 25 and 50 years. Cam lesions are more common in young males.

Cam impingement is a result of a non-spherical head causing abnormal contact stresses.

In most cases, the proximal femoral malformation is idiopathic. It also can be a sequela of childhood disease, including SCFE or any hip in which the femoral neck is too large.

How to use cases

You can use Radiopaedia cases in a variety of ways to help you learn and teach.

Creating your own cases is easy.

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.