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Dynamic joint motion analysis technique

  • US 4,834,057 A
  • Filed: 08/14/1987
  • Issued: 05/30/1989
  • Est. Priority Date: 03/31/1980
  • Status: Expired due to Fees
First Claim
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1. A method for diagnosing the effect of changes in knee torque of an athlete due to changes in frictional forces at the interface between the athlete'"'"'s feet and a playing surface, comprising:

  • measuring the total angular displacements of the knee, including the magnitude of angle of internal/external rotation, while said knee is voluntarily and rapidly bent to its extreme flexed conditions, about three substantially orthogonal axes under a series of predetermined athletic movement test conditions and on a first athlete-playing surface interface to thereby rotationally stress the knee a predetermined number of times, and storing the results of said measuring,repeating the measuring and storing of total angular displacements for said knee including the magnitude of the angle of internal/external rotation, while said knee is again voluntarily and rapidly bent to its extreme flexed conditions about said three axes, using the same predetermined athletic movement test conditions to again rotationally stress said knee, but at a later time and under different athletic-playing surface interfaces, andcomparing the stored magnitude of angle of internal/external rotation produced in the first measurements with the magnitude of angle of internal/external rotation produced in the repeating of said measuring to produce an indication of the changes of knee torque between said first and said different athlete-playing surface conditions and the effect thereof on the athlete'"'"'s knee.

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