Special Section Technical Briefs

Low-Cost Three-Dimensional Printed Surgical Drill-Guiding Device for MPFL Reconstruction (Pat-Rig)1

[+] Author and Article Information
Roopam Dey, Stefan Steiner

Orthopaedic Biomechanics Lab,
Division of Biomedical Engineering,
Department of Human Biology,
Faculty of Health Sciences,
University of Cape Town,
Cape Town 7925, South Africa

Sarthak Patnaik

Department of Arthroscopy and Sport Center,
Sunshine Hospital,
Bhubaneshwar, Odisha 751066, India

Sudesh Sivarasu

Orthopaedic Biomechanics Lab,
Division of Biomedical Engineering,
Department of Human Biology,
Faculty of Health Sciences,
University of Cape Town,
Cape Town 7925, South Africa
e-mail: Sudesh.Sivarasu@uct.ac.za

2Corresponding author.

DOI: 10.1115/1.4033205Manuscript received March 1, 2016; final manuscript received March 17, 2016; published online May 12, 2016. Editor: William Durfee.

J. Med. Devices 10(2), 020914 (May 12, 2016) (3 pages) Paper No: MED-16-1154; doi: 10.1115/1.4033205 History: Received March 01, 2016; Revised March 17, 2016

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Fig. 1

The CAD model of the drill-guiding device: the medio-superior component with slots for housing the drill-guides (1), the inferior component (2), the lateral component (3), the drill guide housing with two 4.5 mm drill guides and 2.5 mm drill-guide (4), and the drill-depth measuring scale (5). Top view of the device around a patella (inset).

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Fig. 2

The isometric view of the fully assembled drill-guiding device. Medial view of the device with the inserted drill-guide housing and the radio-opaque scale (inset).

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Fig. 3

The device placed around a 3D-printed patella. The dashed and solid show the 4.5 mm and 2.5 mm parallel drill holes, respectively. Green-double-headed arrows represent the clearance between the edges of patella and the device.

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Fig. 4

Radiographic image of the Pat-Rig accurately showing the penetration depth of the drill (25 mm with regard to the medial border), which was inserted through the drill-guide holes (inset) and the drilling distance (27.5 mm with regard to the superior border)

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Fig. 5

(a) The drill-guide housing was positioned 10 mm (dz) from the superior face of the patella, (b) medio-lateral holes were drilled into the bone, and (c) cross-sectional view of the drilled holes and the formed bone bridge

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Fig. 6

(a) Orienting the subject's knee at 60 deg flexion and (b) securing the device around the subject's knee



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