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Patellar Subluxation/Dislocation |
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Definition
– A partial dislocation of the patella. The kneecap will usually glide laterally over the femoral condyles and partially dislocate. This will often produce a “giving out” sensation during weight bearing. A “true” dislocation will result in the patella shifting laterally and lock out of place. This results in an obvious gross deformity and spasm of the quadriceps muscle. Severe pain and inability to move the knee will occur with a dislocation.
Method Of Injury
– The knee is most vulnerable for a subluxation at an angle of 20-30 degrees of flexion.
- Muscular imbalance of the medial quadriceps
- Tight lateral structures (ITB, lateral restraints)
- Anatomical abnormality (flattened articular surface)
- Blow to inside of knee
Treatment
– Initial treatment follows the PIER principle (Pressure, Ice, Elevation, Rest)
- X-ray should be taken to rule out any fracture or chip in the patella
- Stretch/strengthen muscle imbalances
- Brace for return to activity
Recommended Products
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Reference WebMD. The contents of this site is for informational purposes only. Always consult a physician or healthcare provider on any medical condition.
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