title: [Patient satisfaction and muscle torque after total knee                     replacement in dependence on body mass index].
abstract: OBJECTIVE
  In a monocentric study, we investigated patient satisfaction, clinical outcome and isokinetic muscle torque in dependence on the body mass index (BMI) in the mid-term outcome after total knee arthroplasty.
  
  
  METHODS
  A group-matched study with two groups (each 40 knee arthroplasties in 40 patients) with a normal body mass index (BMI 20-25) and above 25 was conducted. The groups were matched for sex, diagnosis and age. Satisfaction, HSS score and isokinetic torque parameters with the Cybex 340 system were measured.
  
  
  RESULTS
  There were no differences in the demographic data except for BMI. The HSS score was significantly lower in the overweight group (p = 0.04). Also there were more patients with an HSS score below 60 (bad result) in the group with the higher BMI (0 vs. 9, p = 0.002). Only one patient was not satisfied in the normal weight group, whereas 9 patients in the group BMI > 25 were not satisfied (p = 0.014). No differences between the groups could be found in maximum torque, work and power.
  
  
  CONCLUSIONS
  The patient satisfaction was much lower in patients with BMI higher than 25. There were no differences between the groups in isokinetic torque parameters.
authors.affiliation: Klinik und Poliklinik für Orthopädie-Lehrstuhl für Orthopädie der Universität Regensburg, Asklepios Klinikum Bad Abbach GmbH, Bad Abbach, 93077 Bad Abbach. jens.schaumburger@klinik.uni-regensburg.de
authors.forename: J
authors.initials: J
authors.lastname: Schaumburger
authors.forename: P
authors.initials: P
authors.lastname: Lechler
authors.forename: S
authors.initials: S
authors.lastname: Riedt
authors.forename: H-R
authors.initials: HR
authors.lastname: Springorum
authors.forename: B
authors.initials: B
authors.lastname: Rath
authors.forename: C
authors.initials: C
authors.lastname: Baier
authors.forename: F X
authors.initials: FX
authors.lastname: Köck
authors.forename: J
authors.initials: J
authors.lastname: Grifka
authors.forename: M
authors.initials: M
authors.lastname: Handel
mesh_terms: D000328:Adult; D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000706:statistics & numerical data*; D015992:Body Mass Index; D005260:Female; D005858:Germany / Q000453:epidemiology; D006801:Humans; D007593:Joint Instability / Q000453:epidemiology* / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D053580:Muscle Strength; D017060:Patient Satisfaction / Q000706:statistics & numerical data*; D015995:Prevalence; D011379:Prognosis; D016896:Treatment Outcome