Research Paper

Verifying a Software System for Designing Custom Hip Stems Based on X-Ray Films

[+] Author and Article Information
Ruyu Ma

School of Mechanical Engineering,
Jiangsu University,
Zhenjiang City 212013, China
e-mail: ruyuma@163.com

Hua Ding

Department of Orthopedics,
People's Hospital of Zhenjiang City,
Affiliated to Jiangsu University,
Zhenjiang City 212000, China
e-mail: doctor-dh1973@hotmail.com

Jianhe Wei

Engineering Research Center of Digital Medicine,
Ministry of Education of China,
Shanghai Jiao Tong University,
Shanghai 200030, China
e-mail: jh.wei2002@163.com

Deyong Yang

School of Mechanical Engineering,
Jiangsu University,
Zhenjiang City 212013, China
e-mail: yangdy@163.com

1Corresponding author.

Manuscript received September 4, 2012; final manuscript received April 1, 2013; published online July 3, 2013. Assoc. Editor: William K. Durfee.

J. Med. Devices 7(3), 031001 (Jul 03, 2013) (6 pages) Paper No: MED-12-1111; doi: 10.1115/1.4024659 History: Received September 04, 2012; Revised April 01, 2013

If a custom hip stem could be designed according to X-ray films, the cost of the hip stem would be reduced, and a simpler designing method could be provided than using computer tomography images. In addition, the problem, which is that hip stems cannot be designed for some revision operations because of metal artifacts in computer tomography images, could be solved. A software system for designing custom hip stems based on X-ray films was developed. In order to verify whether the software system could be used, eleven femurs were used for this study. Hip stems for these eleven femurs were designed by using the software system. Ten of these femurs were taken computer tomography scans directly. According to the data collected from the computer tomography images, models of these ten femurs were rebuilt. Ten hip stem models, designed for these ten femurs, were simulated to be inserted into corresponding femur models. Results show each of the ten hip stems matches its corresponding femur. The hip stem designed for the remaining femur was manufactured and inserted in the remaining femur. Cancellous bone, retained in the matching area, was about 1–1.5 mm thick. From the above verifications, it could be concluded that the software system for designing custom hip stems based on X-ray films could be used to design custom hip stems.

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Fig. 1

A femoral wireframe model

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Fig. 2

Hip stem solid model

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Fig. 3

Final model of a hip stem in a femur

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Fig. 4

Hip stem prosthesis

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Fig. 6

Section contour lines traced from CT imagines

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Fig. 7

Sampling positions and distances on section 15

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Fig. 8

Sampling positions and distances on section 14

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Fig. 9

Sampling positions and distances on section 13

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Fig. 10

Sampling positions and distances on section 12

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Fig. 11

Sampling positions and distances on section 11

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Fig. 12

Sampling positions and distances on section 10

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Fig. 13

Ranges and average of sampling distances on each section at the matching area in experimental verification



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