title: [Muscle strength analysis of patella resurfacing in total knee arthroplasty].
abstract: OBJECTIVE
  To investigate the influence of patella tracking and thickness for muscle strength after patellar resurfacing in total knee arthroplasty (TKA).
  
  
  METHODS
  Quadriceps muscle strength of 100 cases 134 knees with osteoarthritis were analysed with isokinetic testing and extension lag after patellar resurfacing in TKA. Result was analyzed statistically through T test.
  
  
  RESULTS
  Significant decreasing of quadriceps muscle strength and endurance were detected on mal-patellofemoral tracking (61 +/- 24, P <0.01) and improper position of patella prosthesis (56 +/- 33, P < 0.01). Anterior knee pain with patella resurfacing was mainly associated with mal-patellofemoral tracking.
  
  
  CONCLUSIONS
  Asymptomatic weakness of quadriceps muscle was mainly associated with improper patella thickness.
authors.affiliation: Department of Orthopedics, People's Hosptal, Peking Medical University, Beijing, China.
authors.forename: Fan
authors.initials: F
authors.lastname: Liu
authors.forename: Hou-Shan
authors.initials: HS
authors.lastname: Lü
authors.forename: Zhi-Song
authors.initials: ZS
authors.lastname: Min