Abstract
The causes of patellofemoral instability (PFI) are complex. In accordance with the current literature aclassification was developed which clearly weights all entities and derives diagnostic and therapeutic consequences. It considers patellar instability and patellar maltracking or the complete loss of patellar tracking and differentiates into 5types. Type1: patellar dislocation without maltracking or instability with alow risk of redislocation. Type2: high risk of redislocation, no maltracking. Type3: instability and maltracking; reasons for maltracking are a)soft tissue contracture, b)patella alta, c)pathological tibial tuberosity trochlear groove (TTTG) distance, c)valgus deformities and e)torsional deformities. Type4: massively unstable floating patella, which is based on ahigh-grade trochlear dysplasia. Type5: maltracking without instability.
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