title: Prevalence and clinical significance of chondromalacia isolated to the anterior margin of the lateral femoral condyle as a component of patellofemoral disease: observations at MR imaging.
abstract: OBJECTIVE
  To determine the prevalence of chondromalacia isolated to the anterior margin of the lateral femoral condyle as a component of patellofemoral disease in patients with anterior knee pain and to correlate it with patient demographics, patellar shape, and patellofemoral alignment.
  
  
  METHODS
  Retrospective study over a 1-year period reviewing the MR knee examinations of all patients who were referred for assessment of anterior knee pain. Only patients with isolated lateral patellofemoral disease were included. Age, gender, distribution of lateral patellofemoral chondromalacia, and grade of cartilaginous defects were documented for each patient. Correlation between the distribution of lateral patellofemoral chondromalacia and patient demographics, patellar shape, and indices of patellar alignment (femoral sulcus angle and modified Q angle) was then ascertained.
  
  
  RESULTS
  There were 50 patients (22 males, 28 females) with anterior knee pain and isolated patellofemoral disease. The majority of the patients (78 %) had co-existent disease with grade 1 chondromalacia. No significant correlation was found between patients with chondromalacia isolated to the anterior margin of the lateral femoral condyle and age, gender, patellar shape, or modified Q angle (p > 0.05). However, patients with chondromalacia isolated to the anterior margin of the lateral femoral condyle had a shallower femoral sulcus angle (mean 141.8°) compared to the patients with lateral patellar facet disease (mean 133.8°) (p = 0.002).
  
  
  CONCLUSIONS
  A small percentage of patients with anterior knee pain have chondromalacia isolated to the anterior margin of the lateral femoral condyle. This was associated with a shallower femoral sulcus angle.
authors.affiliation: Department of Radiology, Cappagh National Orthopaedic Hospital, Dublin, Ireland. vikki_chan12@hotmail.com
authors.forename: V O
authors.initials: VO
authors.lastname: Chan
authors.forename: D E
authors.initials: DE
authors.lastname: Moran
authors.forename: I
authors.initials: I
authors.lastname: Mwangi
authors.forename: S J
authors.initials: SJ
authors.lastname: Eustace
mesh_terms: D000328:Adult; D000368:Aged; D046789:Chondromalacia Patellae / Q000175:diagnosis* / Q000453:epidemiology*; D015897:Comorbidity; D005260:Female; D005269:Femur / Q000473:pathology*; D006801:Humans; D007494:Ireland / Q000453:epidemiology; D008279:Magnetic Resonance Imaging / Q000706:statistics & numerical data*; D008297:Male; D008875:Middle Aged; D046788:Patellofemoral Pain Syndrome / Q000175:diagnosis* / Q000453:epidemiology*; D015995:Prevalence; D015203:Reproducibility of Results; D012307:Risk Factors; D012680:Sensitivity and Specificity; D055815:Young Adult