3D reconstruction of the structure of a residual limb for customising the design of a prosthetic socket

Zheng, Shibao; Zhao, Wei; Lu, Bingheng

doi:10.1016/j.medengphy.2004.08.015

Cited by 51 publications

(32 citation statements)

References 8 publications

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“…Imaging based 3D reconstruction and virtual fitting has been used in other medical specialties [Shuxian et al, 2005; Saeed et al, 2008]. Virtual fitting has been validated compared to implant surgery in cadaver temporal bones and in patients [Maassen et al, 2004].…”

Section: Discussionmentioning

confidence: 99%

Mastoid Cavity Dimensions and Shape: Method of Measurement and Virtual Fitting of Implantable Devices

Handzel

Wang²,

Fiering³

et al. 2009

Audiol Neurotol

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Temporal bone implants can be used to electrically stimulate the auditory nerve, to amplify sound, to deliver drugs to the inner ear and potentially for other future applications. The implants require storage space and access to the middle or inner ears. The most acceptable space is the cavity created by a canal wall up mastoidectomy. Detailed knowledge of the available space for implantation and pathways to access the middle and inner ears is necessary for the design of implants and successful implantation. Based on temporal bone CT scans a method for three-dimensional reconstruction of a virtual canal wall up mastoidectomy space is described. Using Amira® software the area to be removed during such surgery is marked on axial CT slices, and a three-dimensional model of that space is created. The average volume of 31 reconstructed models is 12.6 cm³ with standard deviation of 3.69 cm³, ranging from 7.97 to 23.25 cm³. Critical distances were measured directly from the model and their averages were calculated: height 3.69 cm, depth 2.43 cm, length above the external auditory canal (EAC) 4.45 cm and length posterior to EAC 3.16 cm. These linear measurements did not correlate well with volume measurements. The shape of the models was variable to a significant extent making the prediction of successful implantation for a given design based on linear and volumetric measurement unreliable. Hence, to assure successful implantation, preoperative assessment should include a virtual fitting of an implant into the intended storage space. The above-mentioned three-dimensional models were exported from Amira to a Solidworks application where virtual fitting was performed. Our results are compared to other temporal bone implant virtual fitting studies. Virtual fitting has been suggested for other human applications.

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Section: Discussionmentioning

confidence: 99%

Mastoid Cavity Dimensions and Shape: Method of Measurement and Virtual Fitting of Implantable Devices

Handzel

Wang²,

Fiering³

et al. 2009

Audiol Neurotol

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show abstract

“…An approach based on Computer Tomography and Image Processing is suggested in [17] where the 3D virtual model of internal bones and skin constituting the patient residual limb is derived starting from tomographic images. Moreover, Finite Element Method (FEM) is a well acknowledged technique for physics-based modeling of socketlimb systems, suitable for simulating the biomechanical behavior of the interface.…”

Section: Introductionmentioning

confidence: 99%

Prosthesis Socket Design through Shape Optimization

Frillici

Rotini

2013

Computer-Aided Design and Applications

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Design and manufacturing of socket are difficult activities due to the requirements that this component has to fulfill. Digital models and virtual prototyping techniques have been integrated in the socket development process trying to attain radical improvements of outcomes. However, although these tools allow to decrease the use of physical prototypes and experimental tests on patient, socket shape optimization results still insufficiently supported. In this regard, the adoption of design optimization techniques represents an opportunity to address the recalled problem. Design Optimization is rather common in several engineering fields and Shape Optimization has been widely adopted as useful tool to assist designers in searching for optimal solutions dedicated to prosthetic systems. Starting from these premises, the paper describes an approach to design socket prosthesis, which is based on Shape Optimization. The functional and ergonomic requirements of socket are analyzed and subsequently translated into optimization drivers. Moreover, implementation and integration issues of the proposed approach within the socket development process are investigated. Eventually, an application to a case study is presented aimed at preliminarily verifying potentialities and applicability. The outcomes obtained from this experience are encouraging and suggest to deepen the investigation.

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“…Data from CT have been used in computer-assisted design systems [13] as well as in finite element studies [14][15][16]. Soft tissue and bone can be extracted from SXCT with a resolution better than 1 mm and accuracy of 2.2 mm [17][18].…”

Section: Introductionmentioning

confidence: 99%

Examination of anticipated chemical shift and shape distortion effect on materials commonly used in prosthetic socket fabrication when measured using MRI: A validation study

Safari¹,

Rowe²,

Buis³

2013

JRRD

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Abstract-The quality of lower-limb prosthetic socket fit is influenced by shape and volume consistency during the residual limb shape-capturing process (i.e., casting). Casting can be quantified with magnetic resonance imaging (MRI) technology. However, chemical shift artifact and image distortion may influence the accuracy of MRI when common socket/casting materials are used. We used a purpose-designed rig to examine seven different materials commonly used in socket fabrication during exposure to MRI. The rig incorporated glass marker tubes filled with water doped with 1 g/L copper sulfate (CS) and 9 plastic sample vials (film containers) to hold the specific material specimens. The specimens were scanned 9 times in different configurations. The absolute mean difference of the glass marker tube length was 1.39 mm (2.98%) (minimum = 0.13 mm [0.30%], maximum = 5.47 mm [14.03%], standard deviation = 0.89 mm). The absolute shift for all materials was <1.7 mm. This was less than the measurement tolerance of +/-2.18 mm based on voxel (three-dimensional pixel) dimensions. The results show that MRI is an accurate and repeatable method for dimensional measurement when using matter containing water. Additionally, silicone and plaster of paris plus 1 g/L CS do not show a significant shape distortion nor do they interfere with the MRI image of the residual limb.

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3D reconstruction of the structure of a residual limb for customising the design of a prosthetic socket

Cited by 51 publications

References 8 publications

Mastoid Cavity Dimensions and Shape: Method of Measurement and Virtual Fitting of Implantable Devices

Mastoid Cavity Dimensions and Shape: Method of Measurement and Virtual Fitting of Implantable Devices

Prosthesis Socket Design through Shape Optimization

Examination of anticipated chemical shift and shape distortion effect on materials commonly used in prosthetic socket fabrication when measured using MRI: A validation study

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