We experienced of children with cerebral palsy at our hospital and reviewed the next items.
1) Incidence
2) Relationship between patella alta and range of the knee motion.
3) Relationship between patella alta and age.
4) Relationship between patella alta and genu recurvatum of the knee.
Patella alta observed in 24 cases (56%) of spastic children and 6 cases (30%) of athetoid children.
In spastic children, patella alta increased with age. The range of active knee motion decreased first, then those of passive motion decreased later with age. The number of patients with genu-recurvatum who did not have patella alta was observed more frequently in athetoid than in spastic children.