title: Flexible intramedullary nailing for unicameral cysts in children's long bones : Level of evidence: lV, case series.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the outcome of flexible intramedullary nailing for unicameral bone cysts in terms of function and osseous consolidation.
  
  
  METHODS
  Twenty-two unicameral bone cysts in children's long bones were treated by flexible intramedullary nailing. In 13 cases the bone cyst was diagnosed in a traumatic event leading to a pathologic fracture. Fifteen patients were referred to our clinic after failed conservative treatment. In 16 patients the cyst was located in the humerus, and in 6 patients in the femur. Mean duration of follow-up after surgery was 24 months.
  
  
  RESULTS
  According to Capanna's criteria healing was obtained in 20 cases with a mean time of 16 months. Sixteen cysts healed completely. Four lesions were classified as grade 2, meaning that residual radiolucencies were radiographically visible at the latest follow-up. Two recurrences of humeral cysts were seen at 16 and 18 months postoperatively. The complication rate was minimal.
  
  
  CONCLUSIONS
  Due to the immediate stabilization of the lesion aftercare becomes facile. This method allows prompt mobilization and early weight bearing without the necessity of a plaster cast. Further it prevents effectively the most common complication, a re-fracture or a pathologic fracture. Therefore we propose this surgical procedure as the treatment of choice for unicameral bone cysts in children's long bones.
authors.affiliation: Department of Pediatric Orthopedics and Trauma Surgery, Hospital Clinico Felix-Bulnes, Santiago, Chile, mglanzmann@freesurf.ch.
authors.forename: Michael C
authors.initials: MC
authors.lastname: Glanzmann
authors.forename: Lautaro
authors.initials: L
authors.lastname: Campos