Abstract 724 Introduction: Portions of the occipital condyle are resected during approaches (far/extreme lateral) to the ventral craniovertebral junction. This study was undertaken to determine biomechanics at the occipitoatlantal (C0-C1) and atlantoaxial (C1-C2) joints after gradient unilateral condylectomy. Materials and Methods: Six human cadaveric specimens (skull/upper cervical spine) underwent nondestructive biomechanical testing (physiological loads) in flexion/extension (fx/ex), lateral bending, and axial rotation. Axial translation (tension to compression) was studied across C0-C2. Each specimen served as its own control and underwent baseline testing in the intact state, followed by testing after progressive unilateral condylectomy (25% intervals until completion), which were performed under frameless stereotaxic guidance. Results: At C0-C1, statistically significant increases (from baseline) in mobility were observed, starting at 50% condylectomy, for all motions tested. There was a 15.3%, 40.8%, and 28.1% increase in fx/ex, axial rotation, and lateral bending, respectively. At 75%, the values increased (from baseline)...
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Vishteh et al. (1998) studied this question.