Fig. 2From: Risk factors for screw loosening in patients with adult degenerative scoliosis: the importance of paraspinal muscle degenerationMeasurements of paraspinal muscles. (1) Vertebral cross-sectional area; (2) multifidus muscle cross-sectional area; (3) erector spinae muscle cross-sectional area; and (4) psoas muscle cross-sectional areaBack to article page