The aim of the study was to evaluate the changes in psoas major (PM), erector spinae (ES), multifidus (MF), and rectus abdominis (RA) morphometry in Lenke type V adolescent idiopathic scoliosis (AIS) and control. Forty-two Lenke V AIS patients and 30 control were enrolled. The cross-sectional area (CSA) and CSA index (CI) of the PM, ES, MF, and RA at the T9–L5 levels were measured and compared between Lenke type V patients and control. The CI of the RA was significantly higher in the control group than the Lenke V group in multiple levels. On the other hand, there was no significant difference between patients with Lenke V AIS and control regarding the CI of the RA, ES, and PM. There was no significant difference between concave and convex sides of the Lenke V group regarding the CI of the RA, PM, MF, and ES. RA muscle mass is significantly affected in Lenke type 5 AIS regardless of convex or concave sides. This difference may be related to postural differences and back pain development in Lenke type 5 patients. Level of evidence: Level III.

该研究的目的是评估腰大肌 (PM)、竖脊肌 (ES)、多裂肌 (MF) 和腹直肌的变化(RA) Lenke V 型青少年特发性脊柱侧凸 (AIS) 和对照的形态测量。招募了 42 名 Lenke V AIS 患者和 30 名对照。测量并比较 Lenke V 型患者和对照组在 T9-L5 水平的 PM、ES、MF 和 RA 的横截面积 (CSA) 和 CSA 指数 (CI)。对照组RA的CI在多个水平上均显着高于Lenke V组。另一方面，在 RA、ES 和 PM 的 CI 方面，Lenke V AIS 患者与对照组之间没有显着差异。Lenke V 组的凹凸侧在 RA、PM、MF 和 ES 的 CI 方面没有显着差异。Lenke 5 型 AIS 中 RA 肌肉质量受到显着影响，无论是凸侧还是凹侧。这种差异可能与 Lenke 5 型患者的姿势差异和背痛发展有关。证据等级：III 级。