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Average range of motion at the instrumented level (L3–4) for the intact, Universal Clamp (UC), Universal Clamp with transverse connector (UCTR), and Wallis conditions. AR axial rotation, LB lateral bending. *P < 0.05 for comparisons between intact and instrumented conditions; +P < 0.05 for comparisons between UCTR and Wallis; **P < 0.05 for comparisons between UC and Wallis
