Dejour et al reported risk factors for patellar instability. This condition is typically multifactorial. The authors are from Centre Hospitalier Lyon-Sud in France.
Patient selection: symptomatic patellar instability
Risk factors for patellar instability:
(1) trochlear dysplasia
(2) quadriceps dysplasia
(3) patella alta
(4) pathologic tibial tuberosity-trochlear groove
Condition
Diagnostic Feature
trochlear dysplasia
crossing sign, trochlear bump >= 3mm, and trochlear depth <= 4 mm
quadriceps dysplasia
patellar tilt in knee extension > 20%
patella alta
Caton-Deschamps index >= 1.2
pathologic tibial tuberosity-trochlear groove
groove >= 20 mm
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Specialty: Surgery, orthopedic
