Nicholas D. Fletcher, MD¹ Charles E. Johnston III, MD²

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Presentation transcript:

Nicholas D. Fletcher, MD¹ Charles E. Johnston III, MD² Serial Casting As A Delay Tactic In The Treatment Of Moderate To Severe Early Onset Scoliosis Nicholas D. Fletcher, MD¹ Anna McClung, BSN,RN¹ Charles E. Johnston III, MD² ICEOS 2010 Toronto Disclosures: ¹ None ² Medtronic (1,2,3c,5); Saunders/Mosby-Elsevier (7); Orthopedics (8)

Background Early onset scoliosis (EOS) with moderate to severe curves impedes pulmonary development and increases mortality Use of growing spine and chest wall instrumentation has increased Perceived lack of efficacy of casting? High complication rate and multiple interventions may lessen the appeal of surgical treatment

Purpose To evaluate a single institution’s experience with casting “Uncastable” curves Older children with bigger curves Syndromic or congenital scoliosis 3yo IIS 3yo Lipo

Methods Retrospective review of 58 patients treated with casting between 1993-2010 Inclusion criteria Idiopathic scoliosis >2+6 years of age at initial casting Curves greater than 50 degrees ANY congenital, neuromuscular, syndromic curve Must have been transitioned from a cast to a brace Exclusion criteria Younger patients with smaller curves

Results 36 patients met all inclusion criteria Cast Type 16 Neuromuscular/syndromic 13 idiopathic 5 Skeletal dysplasia/CTD 1 congenital 1 s/p tumor resection Cast Type 22 Risser/translational 14 Mehta/Cotrel derotational 25% had MRI abnormalities of which 66% required neurosurgical intervention

Patient characteristics Age at first cast 4.8 years Follow up 3.9 yrs (0.8 – 9.1) Primary curve 65.6° corrected to 37.9° in cast 3.9 cast changes over 1.1 years Curves after removal 59.4° Increased to 75.4° at final follow up.

Idiopathic vs Non-idiopathic Idiopathic (n=13) NMS/Cong/Syn (n=23) P value Pre cast Cobb 62.2 67.5 0.15 % Correction with cast 45.9% 43.1% 0.68 Preop RVAD 39.5±17 NA Bracing period 39.9 months 18.3 months 0.05 Loss of correction in brace 44.9 35.5 0.19 Need for surgery at follow up 46% 36% 0.73

T1-T12 Height T1/12 growth 1.5 ±1.8 cm Annual growth 0.7 ±1.2 cm/yr

Thoracic Height/Pelvic Width

Complications – 16.6% 1 bilateral femur fx during seizure 3 skin irritation or rash requiring no treatment 1 skin lesion in patient with lipomeningocele requring removal of cast 1 recurrent emesis – cast removed in PACU

Surgical intervention 10+4 8+2 7+5 3+3 5+6 15/36 (39%) required surgery 7 definitive anterior/posterior 8 growing spine constructs Surgery delayed 3.06 years Curve correction 89.9° preop to 44.6° post op (50.3% correction) GR – 90.3° 51.1° (43.1% correction) APSF – 89.5° 38.9° (56.5% correction) p=0.13

Risk for Surgery Greater curve magnitude More time in a cast 71.8° vs 61.7°, p=0.018 More time in a cast 1.43 yrs vs 0.75 yrs, p=0.037 Greater loss of correction out of cast 23° vs 9°, p =0.017 Risser casting Switch to Mehta casting in 2007 may confound Age at presentation and underlying diagnosis not associated with surgery

Discussion Mehta 2005 – casting of idiopathic curves in infantile scoliosis (<1+7 years) successful in curing curve Failure to correct deformity in older children (>2+6 years or curve >52 degrees) 35% underwent surgery by 10+4 Is this a failure? Surgery delayed 3 years in our study Good correction (~50%) achieved with surgery

Complications Growing Spine Instrumentation Chest Wall Expansion Bess JBJS 2010 – 58% complication 6.4 procedures per pt 20% complication risk per procedure Chest Wall Expansion Emans Spine 2005 – 55% complication Combined GSI/VEPTR Sankar Spine 2010 – 72% unplanned surgery Casting – 16% complications 2 required cast removal No additional procedures Sankar et al Spine 2010

Future questions Does casting restrict pulmonary growth? Derotational casting vs Translational casting? Do extended periods of casting help maintain curve compared to transition to bracing? What is endpoint for casting in severe scoliosis?