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Beware of spontaneous reduction masking the true injury!
Knee dislocations are rare due to supporting ligaments (MVCs, falls, sports)
but can be seen after minor trauma in obese patients.
Named by the direction of the displacement of the tibia relative to the femur
- Anterior and posterior are most common
Dislocations involve disruption of at least 2 of the major knee ligaments (ACL/PCL most common)
Usually associated with large hemarthrosis however capsular tearing may allow dissipation of the blood into adjacent soft tissue.
Consider a spontaneously reduced knee dislocation in those with a significant mechanism of injury in the setting of multidirectional instability,