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Phoenix Diagnostic Clinic

Differentials Trochlear dysplazia  ←  Patellar instability

Patellar instability:

– Incidenta 5.8/100,000
– After nonoperative treatment 15-50% recurrence rate
– 55% fail to return to sport acitivity after primary dislocation
Atkin DM et al. Am J Sports Med 2000;28:472

Causes: multifactorial
– Oseous arhitecture
– Soft-tissue constraints (muscles)
Patellar instability

Osseous arhitecture:

1. Trochlear dysplasia
2. Patella alta
3. Femoral and tibial torsion

Soft-tissue causes:

1. Retinacula: medial patellar retinaculum
2. Vastul medialis and vastus lateralis

September 3, 2009

Phoenix Diagnostic Clinic, Bucharest

This site is primarily intended for use by qualified medical or sport professionals.
If you are a consumer, you should evaluate the information together with your physician or other qualified healthcare professional.
The information provided here is for educational and informational purposes only and should not be considered as a medical advice.
As medical and sport science is permanently changing, we (authors and publishers) use our best efforts to provide accurate information, but we can not warrant that the information in this article and web site is accurate, complete or up-to-date.
This article reflects the opinions and judgments of it's author and may be further updated.
If you have questions regarding this article, please contact the author.
Information belongs to Phoenix Diagnostic Clinic, Bucharest

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