Correlation between multifidus muscle atrophy, spinopelvic parameters, and severity of deformity in patients with adult degenerative scoliosis: the parallelogram effect of LMA on the diagonal through the apical vertebra

Table 4 Multiple linear regression analysis of influencing factors and CA

Influencing factors	Variables	B value	Standard error	t value	P value	R² value
Spinopelvic parameters	LL	− 0.335	0.043	− 7.749	< 0.001	0.705
	PI	1.519	0.093	15.781	< 0.001
	PT	− 0.558	0.100	− 5.569	< 0.001
	Constant	− 31.079	3.753	− 8.281	< 0.001
Concave or convex LMA at upper or lower intervertebral level of the apical vertebra	Upper intervertebral level LMA					0.500
	Concave	4.226	1.254	3.369	0.001	–
	Convex	− 8.123	1.000	− 8.122	< 0.001
	Lower intervertebral level LMA					–
	Concave	13.343	1.253	10.645	< 0.001	–
	Convex	− 4.272	0.850	− 5.024	< 0.001
	Constant	4.522	3.573	1.266	0.208	–

CA coronary Cobb angle, LL lumbar lordosis, PI pelvic incidence, PT pelvic tilt, LMA lumbar multifidus atrophy

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