Mendeley  

Zotero  

Chehrassan M, Nikouei F, Shakeri M, Valiollahpour Amiri A, Yaqubnejad M, Ameri E et al . Evaluation of Shoulder Imbalance in Lenke Type 2 Adolescent Idiopathic Scoliosis Undergoing Surgery: A Single Institution Case Series. JROS 2023; 10 (3) :173-182
URL: http://jros.iums.ac.ir/article-1-2245-en.html

Background: Surgical correction of Lenke type 2 adolescent idiopathic scoliosis (AIS) is challenging, particularly when selecting the upper instrumented vertebra (UIV) in the proximal thoracic (PT) curve. Although incorporating PT curve into fusion is standard practice, the effect of UIV selection on postoperative shoulder imbalance is uncertain.
Objectives: This study aims to evaluate shoulder imbalance in patients with lenke type 2 AIS undergoing corrective surgery.
Methods: This retrospective cohort study included 12 Lenke type 2 AIS patients who underwent corrective surgery. Data, including demographic details, radiological features, and shoulder balance, were collected preoperatively, postoperatively, and during follow-up. Statistical analyses were performed to evaluate changes in radiographic angles and shoulder balance.
Results: Significant postoperative reductions were observed in Cobb angles, sagittal alignment, shoulder balance, and lumbar lordosis. The median shoulder balance deviation decreased from the preoperative to the final follow-up. The type of UIV device used showed no significant relationship with changes in shoulder balance. However, the UIV inclination demonstrated a median change of 4.5°, with no significant relationship with the device used.
Conclusion: Preoperative lateral shoulder balance considerably influences postoperative balance, surpassing the impact of UIV selection. Our results underscore the importance of considering shoulder balance when selecting UIV for patients with Lenke type 2 AIS.