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📌 Chronic Patellofemoral Instability
✅ Manifestations of Chronic Patellofemoral Instability
- Fibrosed/thickened/attenuated retinaculum
- Bony productive changes at retinacular attachments
- Ossification of retinacular layers
- Asymmetric retinacular thickening/attenuation
✅ Long-term Changes
- Signs of early osteoarthritis on MRI
- Ligamentous ossifications of the medial patella
- Synovial diverticulum or ganglion cyst formation
✅ Specific Findings
- Concave impaction deformity of the inferomedial patella (sign of prior lateral patellar dislocation)
- Medial retinaculum less likely to tear in recurrent dislocation with patellofemoral dysplasia
✅ Predisposing Factors
- Trochlear dysplasia (abnormally shallow lateral femoral trochlea)
- Patella alta (high-riding patella)
- Abnormal tibial tubercle–trochlear groove (TT-TG) distance
- Femoral anteversion
- Ligamentous laxity
References:
Skeletal Radiol (2012) 41:137–148
Radiographics. 2010 Jul-Aug;30(4):961-81
Radiology. 2002 Dec;225(3):736-43
Radiol Clin N Am 51 (2013) 393–411
#ChronicPatellofemorialInstability, #OsteoarthritisChanges, #LigamentousOssifications, #SynovialDiverticulum, #ConcaveImpactionDeformity, #TrochlearDysplasia, #PatellaAlta, #AbnormalTT-TGDistance, #FemoralAnteversion, #LigamentousLaxity
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