Tag Archives: sports medicine

Measurement of Tibial Tubercle to Trochlear Groove (TT-TG) Distance by MRI for Patellofemoral Instability

Patellar instability, with repeated lateral dislocation, commonly seen in younger, active adults, is associated with a number of anatomical pathologies and usually requires surgical intervention. Among these, increased tibial tubercle to trochlear groove (TT-TG) distance is a prominent risk factor. TT-TG distance describes the degree of lateralization of the tibial tubercle. “TT-TG distance is routinely measured in most patients who present with a partial or complete knee-cap dislocation. This makes it an accessible piece of information that could potentially be used to identify patients at-risk for repeated dislocations,” explains Paul Sherbondy, M.D., Bone and Joint Institute.

MRI Analysis

Analysis of MRIs reveals increased TT-TG distance of 21.36 mm in a patient with repeated patellar dislocation (left), compared to TT-TG distance of 10.49 mm in a patient without patellar dislocation (right).

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Unique Challenges of Managing Injuries on the Sports Field

Scott Lynch, M.D.


Orthopaedists are on-site to manage injuries sustained during play and competition at many collegiate sporting events. With 17 years as a team physician, including the past two years for the Penn State Nittany Lions’ football team, Scott Lynch, M.D., Penn State Hershey Bone and Joint Institute, relays his unique perspective, “Dealing with injured athletes on the playing field is very different from being in the emergency room or clinic; imagine 107,000 people evaluating your performance.”

Privacy for athletes must be a priority, especially when there is media coverage of the event. “Many games are covered by the media, so I ask team support staff to form a circle around me and the injured player. It’s important to establish calm, especially because we need the patient to cooperate,” says Lynch.

Planning ahead is key, including knowing where athletes should be taken for different levels of injuries and the easiest path to the training room. He also recommends talking to the emergency medical services crew before the game, to know how to call them to the field and where to exit the stadium or building. Continue reading

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