Inter- and intra socket shape and volume consistency assessed using magnetic resonance imaging for hands-on and hands-off casting of amputee below knee sockets

Rights statement
Awarding institution
  • University of Strathclyde
Date of award
  • 2010
Thesis identifier
  • T12728
Qualification Level
Qualification Name
Department, School or Faculty
  • Casting consistency has a great influence on the quality of socket fit. Investigations into the shape and volume of trans-tibial prosthetic sockets are complicated due to the difficulty in establishing an accurate reference grid. The use of Magnetic Resonance Imaging (MRI) presents a possible solution to this problem. However, the reliability of MRI in defining the stump/cast interface depends on the materials present not distorting the scanned image.Volume and shape consistency of two casting concepts namely Hands-on and Hands-off were explored using MRI. Prior to this the validity and repeatability of MRI when using common socket material were also examined.The results show that MRI is an accurate and repeatable method in dimensional measurement when using water doped with copper sulphate (CU). Controlled material tests were conducted and the experimental results indicate that the materials, silicone and wet Plaster of Paris (POP) doped with 1gr/l CU, do not distort or interfere with the scanned image. Moreover MRI accuracy was validated using controlled experiments using animal specimens with known volume and surface areas wrapped in POP and silicon liner. No significant errors were indicated.Residual limbs were cast of twelve persons with a unilateral below the knee amputation and scanned twice for each casting concept. Subsequently, all four volume images of an amputee were registered to a common coordinate system using the tibia.The results show that both casting methods have intra cast volume consistency and there is no significant volume difference between two methods. Additionally, inter and intra cast mean volume difference was not clinically significant based on the volume of one sock criteria. Furthermore neither Hands-off method nor Hands-on method results in a consistent residual limb shape as the coefficient of variation of intra cast shape differences were high. Although the resultant shape of the residual limb in Hands-off method was not repeatable, the intra cast shape difference was not clinically significant. However, the Hands-on shape difference is not clinically significant but equal to the maximum acceptable limit for a poor socket fit.
Advisor / supervisor
  • Buis, Arjan
  • Rowe, Philip
Resource Type
Date Created
  • 2010
Former identifier
  • 820667
Embargo Note
  • The electronic version of this thesis is currently under moratorium due to a licensing issue. If you are the author of this thesis, please contact the Library to resolve this issue.