title: Characterisation of dynamic couplings at lower limb residuum/socket interface using 3D motion capture.
abstract: Design and fitting of artificial limbs to lower limb amputees are largely based on the subjective judgement of the prosthetist. Understanding the science of three-dimensional (3D) dynamic coupling at the residuum/socket interface could potentially aid the design and fitting of the socket. A new method has been developed to characterise the 3D dynamic coupling at the residuum/socket interface using 3D motion capture based on a single case study of a trans-femoral amputee. The new model incorporated a Virtual Residuum Segment (VRS) and a Socket Segment (SS) which combined to form the residuum/socket interface. Angular and axial couplings between the two segments were subsequently determined. Results indicated a non-rigid angular coupling in excess of 10° in the quasi-sagittal plane and an axial coupling of between 21 and 35 mm. The corresponding angular couplings of less than 4° and 2° were estimated in the quasi-coronal and quasi-transverse plane, respectively. We propose that the combined experimental and analytical approach adopted in this case study could aid the iterative socket fitting process and could potentially lead to a new socket design.
authors.affiliation: Faculty of Engineering and the Environment, University of Southampton, UK. Electronic address: jt7g13@soton.ac.uk.
authors.forename: Jinghua
authors.initials: J
authors.lastname: Tang
authors.affiliation: Faculty of Engineering and the Environment, University of Southampton, UK.
authors.forename: Michael
authors.initials: M
authors.lastname: McGrath
authors.affiliation: Faculty of Engineering and the Environment, University of Southampton, UK.
authors.forename: Piotr
authors.initials: P
authors.lastname: Laszczak
authors.affiliation: Faculty of Engineering and the Environment, University of Southampton, UK.
authors.forename: Liudi
authors.initials: L
authors.lastname: Jiang
authors.affiliation: Faculty of Health Sciences, University of Southampton, UK.
authors.forename: Dan L
authors.initials: DL
authors.lastname: Bader
authors.affiliation: Chas A Blatchford & Sons Ltd., Endolite Technology Centre, Kingsland Business Park, Hampshire RG24 8PZ, UK.
authors.forename: David
authors.initials: D
authors.lastname: Moser
authors.affiliation: Chas A Blatchford & Sons Ltd., Endolite Technology Centre, Kingsland Business Park, Hampshire RG24 8PZ, UK.
authors.forename: Saeed
authors.initials: S
authors.lastname: Zahedi
mesh_terms: D000328:Adult; D000674:Amputees; D006801:Humans; D035002:Lower Extremity / Q000502:physiology*; D008297:Male; D009068:Movement; D011474:Prosthesis Design / Q000379:methods*
keywords: 3D motion capture; Amputees; Residuum/socket kinematics