Impact of Adjacent Facet Joint Osteoarthritis on Adjacent Segment Degeneration after Short-Segment Lateral Lumbar Interbody Fusion for Indirect Decompression: Minimum 5-Year Follow-Up

Table 2

Five-year outcomes of the ASD+ and ASD- groups.

	ASD+ group	ASD- group
	14	27
Reoperation	2 (14.3%)	0	0.111
Clinical outcome
Change of JOA score (vs. postop.)			0.266
Symptomatic	4 (28.6%)	6 (22.2%)	0.712
Radiographical outcomes
Bony fusion	13 (92.9%)	23 (85.2%)	0.645
Radiographical parameters at cranial adjacent level
Deterioration of disc degeneration (Pfirrmann grading system)	12 (85.7%)	6 (22.2%)	<0.001
Change of dural sac cross-sectional area (%) (vs. post op.)			0.027

ASD: adjacent segment degeneration; JOA: Japanese Orthopaedic Association.