Brandon Moss. Baseball Player Mechanics Analysis - Oakland A’s


The analysis of some aspects of the technique can help to explain the athlete’s performance, injuries and his/her future possibilities. With the information that we present in this blog I’m not intended to replace a scientifically organized evaluation process, but just to play with the available information.

Mr. Moss has history of a left ankle and knee osteochondral defect in 2008.
During running his landing occur in front of the body with the heels. Observing him running from behind we can see the landing with the external aspect of the heel, rolling forward through the external aspect of the foot and ending in a rolling movement of the foot inwards. This rolling creates an external ankle compression and internal knee compression.


Landing in front of the body with heel
Complete extension ankle and incomplete extension of knee during push-off
Landing in front of the body with heel
Complete extension ankle and incomplete extension of knee during push-off
Landing with external aspect of heel
External compression of ankle and internal compression of knee
External rotation of foot creating internal compression of knee



While batting, the left foot remains in the same position during the complete cycle creating a torque at the left knee level. At the end of the rotation the left knee is hyper extended what increases its internal compression.

Initial position
Hip rotates and foot remains in the same initial position
Hip continues rotating while foot remains in the same initial position
Hip continues rotating while foot remains in the same initial position
Movement ends with hyper extension of the knee and internal compression of the ankle
Movement ends with hyper extension of the knee and internal compression of the ankle


Conclusions: moderate risk of injury in the right and left knee and ankle.

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