title: Lower recurrence rate in chondroblastoma using extended curettage and cryosurgery.
abstract: OBJECTIVE
  Various methods for the treatment of chondroblastoma of bone have been used including simple curettage, or combined with bone grafting, in addition to the use of adjuvant therapy. However, local recurrence still represents a challenge in the management of this aggressive tumour. This study focuses on evaluating the role of intraregional extended curettage together with the use of adjuvant cryotherapy and autogenous bone grafting in the treatment of benign chondroblastoma of bone aiming to decrease the recurrence rate.
  
  
  METHODS
  All patients with chondroblastoma included in this study underwent intralesional extended curettage, adjuvant cryotherapy using liquid nitrogen, and autogenous iliac crest bone grafting. Follow up for healing of chondroblastoma lesions and detection of any local recurrence was assessed on clinical and radiological bases. The functional outcome was assessed by the Musculoskeletal Tumour Society scoring system.
  
  
  RESULTS
  The mean follow-up period was 49 months. The average time for bone healing was 7.4 months. Our rate of local recurrence is 7.1 %. Two patients (14.3 %) developed physeal growth arrest. One patient had superficial skin sloughing (7.1 %). None of the cases had pathological fracture. The mean Musculoskeletal Tumour Society functional score was 92.7 %.
  
  
  CONCLUSIONS
  Chondroblastoma is an aggressive benign bone tumour with a high rate of recurrence. The use of high-speed burr combined with adjuvant intralesional cryotherapy and iliac crest autogenous bone grafting is a reliable method of treatment with a low rate of recurrence.
authors.affiliation: Department of Orthopaedic Surgery, Orthopaedic Oncology Unit, Faculty of Medicine, Ain Shams University, Abbasseia Square, Cairo, Egypt, mohamed.mashhour@gmail.com.
authors.forename: Mohamed Ahmed
authors.initials: MA
authors.lastname: Mashhour
authors.forename: Mohamed
authors.initials: M
authors.lastname: Abdel Rahman
mesh_terms: D000293:Adolescent; D000328:Adult; D001859:Bone Neoplasms / Q000601:surgery*; D002648:Child; D002804:Chondroblastoma / Q000601:surgery*; D003452:Cryosurgery; D003475:Curettage / Q000379:methods; D005260:Female; D006801:Humans; D008297:Male; D009364:Neoplasm Recurrence, Local / Q000453:epidemiology* / Q000517:prevention & control*; D055815:Young Adult