Department of Orthopedic Surgery, Second Hospital Affiliated to the Medical College of Xi'an Jiaotong University, Xi'an Shaanxi 710004, People's Republic of China.
BMC Musculoskelet Disord. 2012 Jun 15;13:101. doi: 10.1186/1471-2474-13-101.
The gluteus medius muscle is essential for gait and hip stability. Changes that occur in the gluteus medius muscles in patients with developmental dysplasia of the hip (DDH) are not well understood. A better understanding of DDH related changes will have positive repercussions toward hip soft tissue reconstruction.
19 adult patients with unilateral DDH scheduled for total hip arthroplasty were assessed for: cross-sectional area (CSA), radiological density (RD) and the length of gluteus medius using computed tomograhpy(CT) (scanned before THA). Hip abductor moment arm and gluteus medius activation angle were also measured via hip anteroposterior radiographs.
Both CSA and RD of gluteus medius muscle were significantly reduced (p < 0.05) in the affected hip compared to the control. In the affected hip, the length of the gluteus medius muscle was reduced by 8-11% (p < 0.05) while the gluteus medius activation angle was significantly increased (p < 0.05) and the hip abductor moment arm was decreased (p < 0.05).
The gluteus medius showed substantial loss of CSA, RD as well as decreased length in patients with DDH in the affected hip. These changes should be considered in both hip reconstruction and postoperative rehabilitation training in patients with DDH.
臀中肌对于步态和髋关节稳定性至关重要。患有发育性髋关节发育不良（DDH）的患者的臀中肌会发生变化，但目前对此了解甚少。更好地了解 DDH 相关的变化将对髋关节软组织重建产生积极影响。
19 名单侧 DDH 成年患者接受了全髋关节置换术，通过计算机断层扫描（术前）评估臀中肌的横截面积（CSA）、放射密度（RD）和长度。还通过髋关节前后位 X 线片测量髋关节外展肌力臂和臀中肌激活角。
与健侧相比，患侧臀中肌的 CSA 和 RD 均显著降低（p < 0.05）。患侧臀中肌长度减少 8-11%（p < 0.05），而臀中肌激活角显著增加（p < 0.05），髋关节外展肌力臂减小（p < 0.05）。
DDH 患者患侧臀中肌 CSA、RD 明显减少，长度明显缩短。这些变化在 DDH 患者的髋关节重建和术后康复训练中都应加以考虑。
