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Instrument for measuring the range of motion associated with a human body joint

  • US 4,436,099 A
  • Filed: 08/14/1981
  • Issued: 03/13/1984
  • Est. Priority Date: 08/14/1981
  • Status: Expired due to Fees
First Claim
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1. An apparatus intended for use in measuring the relative angular displacement between two body portions connected to a common joint comprising:

  • a first elongate member;

    a first support means adapted to be connected to a first one of two body portions connected to a common joint for supporting said first elongate member in generally spaced relation to the first body portion, said first support means maintaining said first elongate member in spaced relation to the first body portion as the first body portion is rotated about the common joint;

    a second elongate member;

    a second support member adapted to be connected to a second one of the two body portions for supporting said second elongate member in generally spaced relation to the second body portion, said second support means maintaining said second elongate member in spaced relation to the second body portion as the second body portion is rotated about the common joint;

    means for pivotally interconnecting said first and second elongate members including an encoder means for generating an output signal representing the relative angular position between said first and second elongate members; and

    means coupled to said interconnecting means and responsive to said encoder output signal for determining an angular displacement measurement between said first and second elongate members, said measurement representing the relative angular displacement between the two body portions, said measuring means including a display means for displaying said angular displacement mesurement, means for generating a reset signal defining an initial angular position between said elongate members, said measuring means responsive to said reset signal for determining said angular displacement measurement relative to said initial angular position.

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