title: Simultaneous anterior and posterior synovectomies for treating diffuse pigmented villonodular synovitis.
abstract: BACKGROUND
  The current treatment methods for diffuse intraarticular or extraarticular type pigmented villonodular synovitis (PVNS) include arthroscopic synovectomy or staged anterior and posterior open synovectomies. However, it is unclear whether simultaneous anterior and posterior synovectomies achieve local control and recovery of function.
  
  
  OBJECTIVE
  We therefore determined the recurrence rate and function in patients with diffuse PVNS treated with anterior and posterior synovectomies and adjuvant radiotherapy.
  
  
  METHODS
  We retrospectively reviewed all 19 patients with diffuse PVNS involving the knee treated with anterior and posterior synovectomies and adjuvant radiotherapy between January 2001 and November 2007. From the records, we determined local recurrence and Tegner-Lysholm scores. The minimum followup was 42 months (median, 98 months; range, 42-143 months).
  
  
  RESULTS
  Postoperative MRI revealed residual tumor in five of the 19 patients, although three had no disease progression during followup and had knee scores of 86 to 90. Two patients had recurrences at 6 and 9 months with knee scores of 88 at 42 months and 90 at 68 months. The mean Tegner-Lysholm knee score improved from 59 to 93 points. Mean maximum extension and flexion angles improved from 11° to 2° and from 76° to 127°, respectively.
  
  
  CONCLUSIONS
  Compared with the literature, simultaneous anterior and posterior synovectomies associated with postoperative radiotherapy provided rates of residual or recurrent tumor and knee function recovery comparable to that with staged synovectomies reported in the literature.
  
  
  METHODS
  Level IV, therapeutic study. See Guidelines for Authors for a complete description of levels of evidence.
authors.affiliation: Orthopaedic Department School of Medicine, National Yang-Ming University & Taipei Veterans General Hospital, Beitou District, Taipei City, 11217, Taiwan, ROC. wmchen2499@gmail.com
authors.forename: Wei-Ming
authors.initials: WM
authors.lastname: Chen
authors.forename: Po-Kuei
authors.initials: PK
authors.lastname: Wu
authors.forename: Chien-Lin
authors.initials: CL
authors.lastname: Liu
mesh_terms: D000328:Adult; D001182:Arthroscopy; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000601:surgery*; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D018714:Radiotherapy, Adjuvant; D016059:Range of Motion, Articular; D012008:Recurrence; D000074402:Synovectomy; D013586:Synovitis, Pigmented Villonodular / Q000175:diagnosis / Q000601:surgery*