Comparison of deformity correction and complications with VEPTR and early primary posterior spinal fusion in young children with idiopathic scoliosis:

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Comparison of deformity correction and complications with VEPTR and early primary posterior spinal fusion in young children with idiopathic scoliosis: A retrospective matched cohort analysis Micaela Cyr, BA Patrick Cahill, MD Suhong Tong, MS Tricia St. Hilaire, MPH Harms Study Group Children’s Spine Study Group Sumeet Garg, MD

Study Question What is the optimal treatment of an idiopathic scoliosis patient between 8 and 10 with a curve >50 degrees?

Methods Matched analysis: Age, gender, cobb angle (+/- 10°) Outcome variables: –Radiographic criteria –Number of operations –Unexpected re-operations –Complications

Methods Growth Friendly Construct PSF Number of patients612 Age (years)8-11 (Mean 9.8)10-11 (Mean 10.6) Average preoperative Cobb angle66°65° Average follow up time (years) Open triradiate Each growing surgery patient matched with 1-4 fusion patients.

Results

Growing surgery patients shorter by mm after controlling for preoperative thoracic height (p=0.032) There was a significant difference in Cobb angle at final follow up between the VEPTR cohort (65º) and PSF cohort (24º) (p<0.0001) Growing surgery patients on average had 6.3 more surgeries than PSF cohort (95% CI: )

Complications PSF – 2 of 12 patients with complications –Pulmonary edema – treated medically –Anchor failure – required reoperation Rib based growing surgery – 2 of 6 patients with complications –Superficial infection – treated medically –Anchor failure – required reoperation

Limitations Preliminary study with small sample size Growing surgery patients have not had final fusion No PFT or quality of life data (EOSQ-24)

Conclusions Rib based growing surgery patients undergo more operations Complications and unexpected reoperations are frequent, but not significantly different in this small cohort PSF has reasonable results in immature patients between years Rib based growing surgery can prevent progression in idiopathic scoliosis patients between 8-10 years

Significance Both rib based growing surgery and PSF control juvenile idiopathic scoliosis Further study is needed with a larger cohort and with growing surgery patients followed until their final fusion

References 1. Samdani, A.F., et al., The usefulness of VEPTR in the older child with complex spine and chest deformity. Clinical Orthopaedics and Related Research®, (3): p Gadepalli, S.K., et al., Vertical expandable prosthetic titanium rib device insertion: does it improve pulmonary function? Journal of pediatric surgery, (1): p CampbellJr, R.M., et al., The effect of opening wedge thoracostomy on thoracic insufficiency syndrome associated with fused ribs and congenital scoliosis. The Journal of Bone & Joint Surgery, (8): p Emans, J.B., et al., The treatment of spine and chest wall deformities with fused ribs by expansion thoracostomy and insertion of vertical expandable prosthetic titanium rib: growth of thoracic spine and improvement of lung volumes. Spine, (17S): p. S58-S Waldhausen, J.H., G.J. Redding, and K.M. Song, Vertical expandable prosthetic titanium rib for thoracic insufficiency syndrome: a new method to treat an old problem. Journal of pediatric surgery, (1): p Campbell Jr, R.M., VEPTR: past experience and the future of VEPTR principles. European Spine Journal, 2013: p Motoyama, E.K., C.I. Yang, and V.F. Deeney, Thoracic malformation with early-onset scoliosis: effect of serial VEPTR expansion thoracoplasty on lung growth and function in children. Paediatric respiratory reviews, (1): p