title: Comparison of fatigue life for 3 types of manual wheelchairs.
abstract: OBJECTIVE
  To examine 3 types of manual wheelchairs-ultralight wheelchairs (UWs), lightweight wheelchairs (LWs), and depot wheelchairs (DWs)-and to compare the fatigue life between the wheelchair types.
  
  
  METHODS
  A database of different manual wheelchairs tested according to the International Organization for Standardization (ISO). Fatigue life was determined by using standards that define methods accepted internationally using double-drum and curb-drop testing equipment.
  
  
  METHODS
  A rehabilitation engineering center.
  
  
  METHODS
  Sixty-one manual wheelchairs: 25 DWs, 22 UWs, and 14 LWs.
  
  
  METHODS
  Wheelchairs were examined for differences in fatigue life based on equivalent cycles. Unique survival curves were fit and compared for each wheelchair type.
  
  
  RESULTS
  The UWs lasted the longest, with a mean of 309,362 equivalent cycles. The DWs faired the worst, with a mean of 117,210 equivalent cycles. The Kaplan-Meier survival curves were significantly different (p < .001), with the UWs having the longest fatigue life.
  
  
  CONCLUSIONS
  Fatigue life for UWs is significantly greater (p < .05) than LWs and DWs, indicating wheelchairs differ in durability.
authors.affiliation: Department of Rehabilitation Science and Technology, University of Pittsburgh, PA, USA. sgf9@pitt.edu
authors.forename: S G
authors.initials: SG
authors.lastname: Fitzgerald
authors.forename: R A
authors.initials: RA
authors.lastname: Cooper
authors.forename: M L
authors.initials: ML
authors.lastname: Boninger
authors.forename: A J
authors.initials: AJ
authors.lastname: Rentschler
mesh_terms: D004868:Equipment Failure / Q000706:statistics & numerical data; D014910:Wheelchairs / Q000592:standards*