Congenital malformation of knee

**Inclusion terms:** - Congenital absence of patella - Congenital dislocation of patella - Congenital genu valgum - Congenital genu varum - Rudimentary patella

**Excludes1:** - congenital dislocation of knee (Q68.2) - congenital genu recurvatum (Q68.2) - nail patella syndrome (Q87.2)