• Michael Amini, MD’s research on the development of shoulder arthritis presented at three national meetings

    Michael Amini MD’s research study was recently presented at three national meetings in Orthopaedic Surgery. These included The Western Orthopaedic Association, The Mid America Orthopaedic Association, and The San Diego Shoulder Institute, the largest private shoulder meeting in the United States.

    The study is titled, “Premorbid version affects pathologic morphology in patients undergoing total shoulder arthroplasty”. The research looked at many factors that could potentially influence the severity of arthritis. In addition to age, gender, right or left hand dominance, and other factors, the research used 3D planning with a special tool that allowed the researchers to see the bony shape and anatomy of each patient before they developed arthritis.

    In the picture below, the red represents the size and shape of the surface before the arthritis developed. So the red part that is outside the bone surface represents the amount of bone that has been eroded away by arthritis.

    The research had several key findings:

    ~ The overall shape of the shoulder, defined by something called the Critical Shoulder Angle, influences whether or not someone develops shoulder arthritis

    ~ The exact angles of the bony surface before someone develops arthritis influences how severe the arthritis becomes, and how much bony erosion will develop

    This information is helpful when talking to patients about their shoulder arthritis. We now know which individuals are more likely than others to develop severe bony erosions if the arthritis is left alone, while some people are less likely to have this happen.

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