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Disc height changes. A & B. Hybrid group. ADH and PDH at each segment and corresponding segment has no significant change (all p>0.05). C & D. Fusion group. ADH and PDH at each segment and corresponding segment both have no significant change in the Fusion group. However, ADH at the second above segment and PDH at the above adjacent segment have a statistically higher value in the Hybrid group than those in the Fusion group at final follow-up (each p=0.04).
