title: Talolisthesis in end stage ankle arthrosis.
abstract: BACKGROUND
  Sagittal displacement in patients with end stage ankle arthritis has been described as the tibiotalar ratio (TTR). Yet the incidence, distribution and predictive factors of talolisthesis are unknown.
  
  
  METHODS
  The radiographs of 470 cases of ankle arthritis were compared with a control group of 49 normal ankles. The TTR was measured for both groups. Additional co-variables included the anterior and lateral distal tibial angles, and talar tilt.
  
  
  RESULTS
  The mean TTR in the arthritis cohort was 34.8+9.12 compared to the normal group of 34.1+2.62. Twenty-eight percent of the ankles had anterior displacement and twenty-eight percent had posterior talolisthesis, while forty-four percent had normal tibiotalar alignment. Multivariate linear regression revealed significant predictors of anterior distal tibial angle (p<0.0001) and talar tilt (p=0.0007) for abnormal TTR.
  
  
  CONCLUSIONS
  Sagittal displacement is common in end stage ankle arthritis and is affected by ligamentous laxity and joint morphology.
authors: Attending Surgeon, Department of Orthopedics Swedish Medical Center, Seattle, WA. 3131 Nassau Street, Suite 101, Everett WA 98201. Electronic address: jccdpm@gmail.com.
authors: Jeffrey C
authors: JC
authors: Christensen
authors: Chief of Foot & Ankle Service, Kaiser Permanente, San Francisco, CA. Department of Orthopedic Surgery, 450 6(th) Avenue, San Francisco, CA 94118. Electronic address: jmfoot@aol.com.
authors: John M
authors: JM
authors: Schuberth
authors: Attending Staff, Minor and James Medical Clinic 515 Minor Avenue, Suite 24 Seattle, WA 98122. Electronic address: eric.egp@gmail.com.
authors: Eric G
authors: EG
authors: Powell
mesh_terms: D000328:Adult; D000843:Ankle Joint / Q000000981:diagnostic imaging* / Q000503:physiopathology / Q000601:surgery; D016022:Case-Control Studies; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007593:Joint Instability / Q000000981:diagnostic imaging* / Q000209:etiology / Q000503:physiopathology; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D019637:Orthopedic Procedures / Q000379:methods; D010003:Osteoarthritis / Q000150:complications / Q000000981:diagnostic imaging* / Q000503:physiopathology; D011859:Radiography / Q000379:methods; D012016:Reference Values; D012189:Retrospective Studies; D018570:Risk Assessment; D012720:Severity of Illness Index; D013628:Talus / Q000000981:diagnostic imaging* / Q000473:pathology
keywords: Ankle arthritis; Ankle arthrosis; Sagittal displacement; Talolisthesis