title: [Effects of varus of knee osteoarthritis on patellar position].
abstract: OBJECTIVE
  To explore the effects of varus of knee osteoarthritis (OA) on patellar position.
  
  
  METHODS
  A total of 19 patients (27 knees) underwent the examinations of anterior-posterior, lateral knee and axis of patellar X-ray at 30°, 45°, 60° and each X-ray was measured.
  
  
  RESULTS
  The ratio between length of patellar tendon and length of patellar, vertical distance of lower edge of patellar to tibial plateau and height of patellar, distance of lower edge of medial facet of patellar to anterior angle of tibia and height of patellar were different from normal values. Patellar moved medially during the process of bending from 30°to 60°.
  
  
  CONCLUSIONS
  The patellar of knee OA patients with varus moves down and medially.
authors.affiliation: Department of Orthopedics, Peking University People's Hospital, Beijing 100044, China.
authors.forename: Hongliang
authors.initials: H
authors.lastname: Ma
authors.affiliation: Department of Orthopedics, Peking University People's Hospital, Beijing 100044, China. Email: zhoudiange@vip.sohu.net.
authors.forename: Diange
authors.initials: D
authors.lastname: Zhou
mesh_terms: D000368:Aged; D005260:Female; D056305:Genu Varum / Q000000981:diagnostic imaging; D006801:Humans; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000000981:diagnostic imaging; D010329:Patella / Q000000981:diagnostic imaging; D011859:Radiography