1Biomechanics Laboratory, Case Western Reserve University, Cleveland. OH 44106. U.S.A.
2Henry Ford Hospital, Detroit, MI, U.S.A.
This paper presents an in vivo clinical method for describing the three-dimensional configuration of spinal segments. The technique is based upon the characterization of each vertebral segment by four points in three-dimensional space using bi-plane roentgenography and subsequent analysis by computer aided descriptive geometry techniques.
Tests were conducted to determine the system's accuracy and repeatability. The results of these tests using both a calibrated mechanical model of the spine and actual in vivo spine evaluations are presented.