Patelofemoral instability in Down syndrome´s patients appears in hiperlaxity and open physis context. Our aim is to make a retrospective clinical-functional assessment of the soft tissue procedure treatment of patellofemoral instability in patients with Down Syndrome skeletally immature (open physeal), following them until the physeal closure. We have included six patients (9 knees) with a mean age of 12.4 years old. Patellar instability (Dugdale´s classification) distribution was 1 (11.1%) cases degree ll; 2 (22.2%) cases degree lll and 6 (66.6%) cases degree IV. Patellar function assessed by Insall score at follow up was excellent in 6 of the cases, good in 2 cases and bad in one case (recurrent dislocation). In summary, a proximal soft tissues procedure in Down syndrome patients could be enough for patellar instability treatment.

Patelofemoral instability in Down syndrome´s patients appears in hiperlaxity and open physis context. Our aim is to make a retrospective clinical-functional assessment of the soft tissue procedure treatment of patellofemoral instability in patients with Down Syndrome skeletally immature (open physeal), following them until the physeal closure. We have included six patients (9 knees) with a mean age of 12.4 years old. Patellar instability (Dugdale´s classification) distribution was 1 (11.1%) cases degree ll; 2 (22.2%) cases degree lll and 6 (66.6%) cases degree IV. Patellar function assessed by Insall score at follow up was excellent in 6 of the cases, good in 2 cases and bad in one case (recurrent dislocation). In summary, a proximal soft tissues procedure in Down syndrome patients could be enough for patellar instability treatment.