Pressure sores occur from constant pressure on one area of the body. Being able to stand up in a wheelchair helps distribute your weight and improve healing of pressure/bed sores.
When fully standing, the pressure is completely relieved off of the ischial tuberosities (ITs). The ischial tuberosity is a swollen part or broadening of the bone in the frontal portion of the ischium, the lowest of the three major bones that make up each half of the pelvis which support the body weight when sitting. With simply tilting or reclining, there is only partial distribution under the ITs.
Pressure sores are a primary complication for wheelchair users. By frequent standing, you are completely relieving the pressure off of the ITs and increasing circulation to those areas improving healing and much needed relief.
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