Fig. 2From: Pedicle screw fixation and posterior fusion for lumbar degenerative diseases: effects on individual paraspinal muscles and lower back pain; a single-center, prospective studyChanges in the multifidus muscle in group I. Pre-OP: preoperative; PO # 3 M, 6 M, 12,M, 18 M: 3, 6, 12, 18 months postoperativelyBack to article page