MASH Study Group

MASH Study GroupThe MASH Study Group is looking to find answers to difficult questions related to the surgical treatment of patients with adolescent and young adult hip injuries. As a medically-focused collective of leading hip specialists, the MASH Study Group has 22 publications in peer-reviewed journals – journals that are read by leading surgeons in the United States and around the world.

All hip surgical patients are invited to participate. Patients are asked to complete four questionnaires regarding their pain and how it affects their daily activities. These questionnaires are completed pre-surgery, and at 1, 2 and 5 years post-surgery.

A variety of studies will be conducted with the data obtained from the MASH project. Each project which uses the data collected will go through the appropriate Institutional Review Board (IRB).

The 2024 Annual Meeting of the MASH Study Group held in Atlanta, Georgia.

The 2024 Annual Meeting of the MASH Study Group held in Atlanta, Georgia. (Dr. Carreira is seated in the front row, at left.)

The ability to bring data together from multiple centers empowers our study group to make conclusions that a single surgeon experience could not produce.

Because labral injuries are the most common diagnosis for which hip arthroscopy is performed, we are looking to define these injuries further and to investigate the outcomes related to the different forms of labral injury. We are also looking at the “environment” in which these labral injuries occur, including the effect of synovitis and articular cartilage injury.

A number of other more unusual diagnoses and their treatments, for which we historically have had limited outcome data, also are being addressed. These areas of study include, but are not limited to, synovial diseases (synovial chondromatosis and pigmented villonoudlar synovitis), the size of articular chondral injuries, and the internal and external snapping hip joint.

MASH Study Group Participant Portal

If you are a MASH participant, you can access the patient portal here:

Further Details

For further information regarding the MASH Study Group, including participating surgeons, funding and more, please visit our website,