1. Incidence, mechanism of injury, and treatment of fractures of the patella in children;Ray;J Trauma.,1992
2. Sleeve fractures of the patella in children: a report of three cases;Houghton;Bone Joint J.,1979
3. Subacute superior patellar pole sleeve fracture;Kimball;Am J Orthop.,2014
4. Avulsion fractures of the patella;Grogan;J Pediatr Orthop.,1990
5. Sleeve fracture of upper pole of patella;Bishay;Bone Joint J.,1991