Evaluation of kerb negotiation in a prototype and standard model wheelchair

This article outlines an evaluatory study of kerb negotiation in a conventional wheelchair and a prototype diamond configuration, lever articulated wheelchair. The kerb negotiation sequence in both models is presented with the results of tests involving users able to negotiate kerbs (N = 16); users unable to negotiate kerbs (N = 15); and non-wheelchair users (N = 20). Results indicate preferences for the prototype amongst the first group, particularly for kerb descent. Free rolling tests of the loaded wheelchairs over various terrains revealed that while the standard wheelchair invariably turned downhill the prototype was relatively insensitive to loss of direction on sideslopes. A significant number of subjects (P = 0.01, N = 20) found the articulated framework of the prototype reduced the difficulties of self propulsion over rough and cambered surfaces. The prototype was found to possess a smaller turning circle (103 cm to 122 cm) and a longer wheelbase (94.7 cm to 39.7 cm) than the standard model though overall dimensions were broadly comparable. The implications of the prototype wheelbase for manual, attendant and powered propulsion are considered.