Influence of sacral sitting in a wheelchair on the distribution of contact pressure on the buttocks and back and shear force on the ischial region.
Tadahiko Kamegaya
PMID 27821944WHAT IT FOUND
In healthy young adults, slumping into sacral sitting lowered peak pressure on the buttocks but raised shear force on the ischial region.
This shift moves risk from direct pressure to friction, a factor that contributes to pressure ulcers in frail wheelchair users.
Key findings
01Sacral sitting significantly reduced maximum contact pressure on the buttocks and ischial region compared to basic sitting.
02Sacral sitting significantly increased maximum contact pressure on the back and shear force generated by sliding the ischium forward.
03The study participants were healthy young adults, not the frail older users who typically exhibit sacral sitting.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
The study used healthy young adults (mean age 21), so the results may not accurately reflect the tissue tolerance or body mechanics of frail older adults who typically use wheelchairs. The sacral sitting posture was artificially defined by sliding the ischium forward 5 cm, which may not represent all natural variations of slumping. The study measured immediate mechanical forces, not long-term clinical outcomes like actual pressure ulcer development.
Declared interests
No conflicts of interest or funding sources were reported in the provided text.
The easy way to misread this
Do not conclude that sacral sitting is safer because it lowers peak pressure on the buttocks. The study shows it increases shear force, which is a distinct and significant risk factor for pressure ulcers.