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Mean ROM (in degrees) of all 21 segments including 95% confidence interval. PHY segments with all stabilizing structures intact, UDC after bilateral undercutting decompression, UDC-W after additional implantation of Wallis, UDC-D after removal of Wallis and subsequent implantation of Dynesys®. ROM for lateral bending and axial rotation include displacement to the left and right side
