Method for determining kinematic parameters of the in vivo thumb carpometacarpal joint

Lillian Y. Chang and Nancy Pollard
IEEE Transactions on Biomedical Engineering, Vol. 55, No. 7, July, 2008, pp. 1897-1906.


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Abstract
The mobility of the thumb carpometacarpal (CMC) joint is critical for functional grasping and manipulation tasks. We present an optimization technique for determining from surface marker measurements a subject-specific kinematic model of the in vivo CMC joint that is suitable for measuring mobility. Our anatomy-based cost metric scores a candidate joint model by the plausibility of the corresponding joint angle values and kinematic parameters rather than only the marker trajectory reconstruction error. The proposed method repeatably determines CMC joint models with anatomically-plausible directions for the two dominant rotational axes and a lesser range of motion (RoM) for the third rotational axis. We formulate a low-dimensional parameterization of the optimization domain by first solving for joint axis orientation variables that then constrain the search for the joint axis location variables. Individual CMC joint models were determined for 24 subjects. The directions of the flexion??xtension (FE) axis and adduction??bduction (AA) axis deviated on average by 9 degrees and 22 degrees, respectively, from the mean axis direction. The average RoM for FE, AA, and pronation??upination (PS) joint angles were 76 degrees, 43 degrees, and 23 degrees for active CMC movement. The mean separation distance between the FE and AA axes was 4.6 mm, and the mean skew angle was 87 degrees from the positive flexion axis to the positive abduction axis.

Keywords
axes of rotation, subject-specific joint models, thumb mobility

Notes
Associated Center(s) / Consortia: Center for the Foundations of Robotics
Associated Lab(s) / Group(s): Computer Graphics Lab
Number of pages: 10
Note: Copyright 2008 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

Text Reference
Lillian Y. Chang and Nancy Pollard, "Method for determining kinematic parameters of the in vivo thumb carpometacarpal joint," IEEE Transactions on Biomedical Engineering, Vol. 55, No. 7, July, 2008, pp. 1897-1906.

BibTeX Reference
@article{Chang_2008_6101,
   author = "Lillian Y. Chang and Nancy Pollard",
   title = "Method for determining kinematic parameters of the in vivo thumb carpometacarpal joint",
   journal = "IEEE Transactions on Biomedical Engineering",
   pages = "1897-1906",
   month = "July",
   year = "2008",
   volume = "55",
   number = "7",
   Notes = "Copyright 2008 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE."
}