title: [An experimental study of viscoelastic properties of articular-cartilage of patella].
abstract: OBJECTIVE
  To study the viscoelastic properties of human articular cartilages of patella in 8 cadavers, which were obtained from patients ranged in age from nineteen to fifty-one years old and died of acute head injury.
  
  
  METHODS
  The creep and stress relaxation of articular cartilage of patella were abserved in the condition of articular cartilage loaded of 500 Pa, just as the physiological load of articular cartilage of patella in keeping human body standing position with the knee joint flexed 30 degrees, during the experiment. The deformation-time curve under certain load, the load-time curve under certain deformity and related data were obtained.
  
  
  RESULTS
  Creep and stress relaxation showed that obvious changes occured in the first 10-15 minutes during the whole process.
  
  
  CONCLUSIONS
  The data and curve will not only be helpful to understand the pathogenesis of chondromalacia, but also propose a feasible method to study it from biomechanical view, meanwhile provide reference data for designing the prosthesis of patella and material choosing.
authors.affiliation: Department of Orthopedics, PUMC Hospital, CAMS and PUMC, Beijing 100730.
authors.forename: X
authors.initials: X
authors.lastname: Weng
authors.forename: J
authors.initials: J
authors.lastname: Zhang
authors.forename: J
authors.initials: J
authors.lastname: Zhang
authors.forename: G
authors.initials: G
authors.lastname: Qiu
authors.forename: H
authors.initials: H
authors.lastname: Mao
mesh_terms: D000328:Adult; D002358:Cartilage, Articular / Q000502:physiology*; D004548:Elasticity; D006801:Humans; D008875:Middle Aged; D010329:Patella / Q000502:physiology*