A nonspecific term for an acquired change in musculo skeletal mechanics resulting in faulty movement patterns.
When we have a Biomechanical disfunction, it means that a particular structure or set of structures in our body is not working correctly due to injury or some other intrinsic / extrinsic event.
A swimmer whose scapula does not tilt backward fully is at risk of a pinching or impingement injury to the shoulder joint when they are at full arm stretch.
* If a person works out doing lateral raise at the gym but without anchoring the scapula with the correct muscle groups, the scapula is forced into downward rotation instead of upward rotation, again risking an impingement injury.