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Fully automated computer algorithm for calculating articular contact points with application to knee biomechanics

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Abstract

A fully automated computer algorithm for calculating the articular contact points between two bone surface models is presented. The algorithm requires the bone surface models and their relative positions as inputs in order to resolve the articular contact path. In the case of surface model overlap due to measurement errors or as a solution of an optimization procedure, the result is a volumetric estimation of the space confined between the two surfaces. The algorithm is based on attaching a grid of lines to one bone surface model and calculating the intersecting points of each of the lines in the grid with both bone surface models. The contact points are then determined as the closest points between the surfaces along the lines in the grid. The same contact points are used to evaluate any volume that is confined between two overlapping surface models. The algorithm is ideal for use in biomechanical studies, simulations of joint motion, and optimizations that require an iterative process to determine contact path and relative bone position. The algorithm is applied to a Sawbones® knee model that is moved from flexion to extension while being tracked by an optical tracking system. The contact path of the two bones is generated and an example of calculating bone impingement is provided.

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Acknowledgments

This work was supported by the National Science Foundation of the United States under NSF ITR Grant No. 0325920.

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Authors and Affiliations

  1. Faculty of Mechanical Engineering, Technion Israel Institute of Technology, Haifa, 32000, Israel

    Alon Wolf

  2. Institute for Computer Assisted Orthopedic Surgery (ICAOS), The Western Pennsylvania Hospital, Mellon Pavilion, Suite 242, 4815 Liberty Avenue, Pittsburgh, PA, 15217, USA

    Branislav Jaramaz & Patricia E. Murtha

Authors
  1. Alon Wolf
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  2. Branislav Jaramaz
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  3. Patricia E. Murtha
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Correspondence to Alon Wolf.

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Wolf, A., Jaramaz, B. & Murtha, P.E. Fully automated computer algorithm for calculating articular contact points with application to knee biomechanics. Med Biol Eng Comput 46, 233–240 (2008). https://doi.org/10.1007/s11517-007-0297-4

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  • DOI: https://doi.org/10.1007/s11517-007-0297-4

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