Medical College of Wisconsin
CTSICores SearchResearch InformaticsREDCap

Effect of Surgical Fusion on Volitional Weight-Shifting in Individuals With Adolescent Idiopathic Scoliosis. Spine Deform 2016 11;4(6):432-438



Pubmed ID




Scopus ID

2-s2.0-84994845368   2 Citations


STUDY DESIGN: Prospective.

OBJECTIVES: The goals of this study were to (1) evaluate the differences in weightbearing symmetry between individuals with adolescent idiopathic scoliosis (AIS) and typically developing controls; (2) observe the effect of posterior spinal fusion and instrumentation (PSFI) on volitional weight-shifting at 1 and 2 years postoperatively; and (3) evaluate whether lowest instrumented fusion level (ie, lowest instrumented vertebra [LIV]) in PSFI has an effect on volitional weight-shifting.

SUMMARY OF BACKGROUND DATA: Previous studies have conflicting findings with regard to the effect of scoliosis on postural control tasks as well as the effect of surgery. They have also noted an inconsistent effect of PSFI at different LIVs, with more distal LIVs exhibiting greater reductions in postoperative range of motion.

METHODS: The study was designed with an AIS group of 41 patients (8 males and 33 females) with AIS who underwent PSFI, along with a Control Group of 24 age-matched typically developing participants (12 male and 12 female). Both groups performed postural control tasks (static balance and volitional weight-shifting), with the AIS group repeating the tasks at 1 and 2 years postoperatively.

RESULTS: At baseline, the AIS group showed increased weightbearing asymmetry than the Control Group (p = .01). The AIS group showed improvements in volitional weight-shifting at 2 years over baseline (p < .01). There was no effect of LIV on volitional weight-shifting by the second postoperative year.

CONCLUSIONS: Individuals with AIS have greater weightbearing asymmetry but improved volitional weight-shifting over typically developing controls. PSFI improves volitional weight-shifting beyond preoperative baseline but does not differ significantly by LIV.

Author List

Kurapati NT, Krzak JJ, Graf A, Hassani S, Tarima S, Sturm PF, Hammerberg K, Gupta P, Harris GF


Gerald Harris PhD Director in the Orthopaedic Research Engineering Center (OREC) department at Marquette University
Sergey S. Tarima PhD Associate Professor in the Institute for Health and Equity department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Prospective Studies
Retrospective Studies
Spinal Fusion
Treatment Outcome
jenkins-FCD Prod-486 e3098984f26de787f5ecab75090d0a28e7f4f7c0