Wheelchair use often means spending many hours in the same, seated position with no load on the legs, which can cause functional deterioration and loss of bone mass. This in turn makes the skeleton more brittle and thus subject to higher risk of fracture. Wheelchair use has therefore been considered a risk factor for fractures.
The current study — published in the journal JAMA Network Open — shows, however, that wheelchair use should not be seen as a risk factor for fracture in the group of elderly frail people. It was in fact the study’s wheelchair users who suffered fractures least often.
Comprising 55,442 wheelchair users in Sweden with an average age of 83 years, this is the largest study in the research area to date. Six of ten participants were women. People in the matched control group were ambulatory (able to walk about), with or without technical aids. The median follow-up period was approximately two years.
The wheelchair users suffered 4,148 fractures, fewer than half of the control group’s 10,344. More precisely, the controls’ risk was equivalent to 2.3 times the wheelchair users’. This was for fractures in general.
For osteoporotic and hip fractures, the intergroup differences were even more marked: There were less than a third as many fractures in the wheelchair users, and their risk of injurious falls was less than half as high, as among the ambulatory controls.
A wheelchair is usually prescribed by a physical or occupational therapist in Sweden, while in other countries it may be prescribed by a doctor. The patient’s needs determine whether a wheelchair is recommended. Factors taken into account include immobility, weakness, poor balance, and frequent falling.
Mattias Lorentzon, Professor of Geriatrics at the University’s Sahlgrenska Academy and chief physician at Sahlgrenska University Hospital, is the study’s senior and corresponding author.
"What we’ve shown is the link between wheelchair use and a massively reduced risk of fractures in frail elderly people, irrespective of potential reasons for using the wheelchairs. Since fractures — especially of the hip — cause enormous suffering and call for huge health care resources, these findings are important," he notes.
The study’s first author is Kristian Axelsson, resident physician at the Närhälsan health center in Skövde and researcher at Sahlgrenska Academy, University of Gothenburg.
"The findings are of particular interest to anyone thinking of prescribing a wheelchair for a patient and performing a risk–benefit analysis. Being sedentary in a wheelchair is negative in many ways, so it’s good to see that fall and fracture risks are reduced," Axelsson says.
REHACARE.com; Source: The Swedish Research Council