It is an inverted triangle the base of which is formed by the 12th rib and the lower edge of serratus posterior inferior muscle, anteriorly bounded by the posterior border of internal oblique muscle, posteriorly bounded by the anterior border of sacrospinalis muscle
The Oswestry Disability Index (ODI) scores, Visual Analog Scale (VAS) scores, and sacrospinalis muscle damage evaluation indicators before operation and 3, 12 months postoperation were compared.
The direct exposure of the facet and transverse processes through the sacrospinalis muscle causes very little stripping damage to sacrospinalis muscle, and this exposure is helpful during postoperative recovery.
Sacrospinalis muscle damage evaluation indicator: Three months postoperation, patients in the two groups received electrophysiological examinations of sacrospinalis muscle at the surgical segment.
The t -test was performed to evaluate changes in surgical indicators, sacrospinalis muscle injury evaluation indicator, VAS scores, and ODI scores before and after surgery of the two groups.
The AMP ([micro]V), average discharge frequency of sacrospinalis muscle, and MR T2 relaxation time between groups were not significantly different ( P ≥ 0.