Residual limb fluid volume during walking, standing, resting
If a prosthetic socket is too loose pistoning may occur, leading to gait instability and falls. When it is too tight; vascular flow may be impeded and soft tissue damage can occur.
Different daily movements and postures affect the volume of the residual limb and therefore socket fit. The biggest drop in fluid volume is seen when a patient is standing with weight balanced between the two feet. During both seated rest and treadmill walking, fluid volume has a tendency to increase (although this is not always the case.) Persons suffering from peripheral arterial disease take longer to recover from changes to limb volume.
This information is very useful in the development of prosthetic sockets, as it would appear an accommodation strategy should be used to assist in the return to normal fluid volume during rest. Four different groups have emerged, with differing reactions to the activities. It is believed that further investigations will determine further influential factors.
Watch a great informative video on the matured residual limb below: