title: Tibial tuberosity-trochlear groove distance in Chinese patients with or without recurrent patellar dislocation.
abstract: OBJECTIVE
  To compare the tibial tuberosity-trochlear groove (TTTG) distance in Chinese patients with or without recurrent patellar dislocation.
  
  
  METHODS
  The TTTG distance of 14 knees in 5 men and 9 women aged 16 to 38 years with recurrent patellar dislocation were compared with that of 73 control knees using magnetic resonance imaging.
  
  
  RESULTS
  The mean TTTG distance was significantly greater in patients with recurrent patellar dislocation than in controls (16.4 mm vs. 10.1 mm, p<0.001). Six (43%) knees with recurrent patellar dislocation had the TTTG distance greater than the cut-off threshold of 16.4 mm, compared to none in controls.
  
  
  CONCLUSIONS
  The TTTG distance is related to height and is shorter in Chinese than Caucasian patients; the threshold for tibial tuberosity transfer should be lower in Chinese patients.
authors: Department of Orthopaedics and Traumatology, Kwong Wah Hospital, Hong Kong.
authors: Michael Siu Hei
authors: MS
authors: Tse
authors: Department of Orthopaedics and Traumatology, Kwong Wah Hospital, Hong Kong.
authors: Chester Wai Hung
authors: CW
authors: Lie
authors: Department of Radiology, Kwong Wah Hospital, Hong Kong.
authors: Nin Yuan
authors: NY
authors: Pan
authors: Department of Radiology, Kwong Wah Hospital, Hong Kong.
authors: Chi Hin
authors: CH
authors: Chan
authors: Department of Radiology, Kwong Wah Hospital, Hong Kong.
authors: Hung Lit
authors: HL
authors: Chow
authors: Department of Orthopaedics and Traumatology, Kwong Wah Hospital, Hong Kong.
authors: Wai Lam
authors: WL
authors: Chan
mesh_terms: D000293:Adolescent; D000328:Adult; D002681:China / Q000453:epidemiology; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000473:pathology*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D031222:Patellar Dislocation / Q000175:diagnosis* / Q000453:epidemiology; D015995:Prevalence; D013977:Tibia / Q000473:pathology*; D055815:Young Adult
keywords: magnetic resonance imaging; patellar dislocation