Behrooz A. Akbarnia Nima Kabirian Jeff Pawelek Milad Alam

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Presentation transcript:

Post-Operative Wound Infection in Growing Rod Surgery for Early-Onset Scoliosis Behrooz A. Akbarnia Nima Kabirian Jeff Pawelek Milad Alam Greg M Mundis Ricardo Acacio George H. Thompson David S. Marks Adrian C. Gardner David L. Skaggs GSSG The 5th International congress on Early Onset Scoliosis (ICEOS) November 18-19, 2011. Orlando, Florida, USA

Disclosures Author Disclosure Behrooz A Akbarnia (a) K2M, DePuy, Ellipse; (b) K2M, Ellipse, Kspine, DePuy; (c) Ellipse, K Spine Nima Kabirian No relationship Jeff Pawelek Milad Alam Greg M Mundis (a) DePuy; (b) K2M (d) K2M Ricardo Acacio George H Thompson (b) OrthoPediatrics, SpineForm; (e) JPO David S Marks (b) Depuy, Medtronic; (c) K2M Adrian C Gardner David L Skaggs (b) Medtronic, Stryker; (d) Medtronic, Stryker; (e) Biomet Grants/Research Support Consultant Stock/Shareholder Speakers’ Bureau Other Financial Support

Introduction The risk of Post Operative Wound Infection (POWI) after growing rod (GR) surgery for early onset scoliosis (EOS) is real due to presence of co-morbidities and repeated surgeries The characteristics and management of POWI after GR surgery has not been clearly characterized yet.

Introduction JBJS, 2010 Out of a total of 177 complications, there were 21 post operative wound infections in 20 (14.3%) patients. Six superficial wound infections, all in dual GR and 15 deep wound infections, 9 in dual rod GR

Methods Multi-center, retrospective, IRB approved review of clinical and radiographic data of 329 patients from 9 sites Inclusion criteria included: 1- EOS patients with any etiology 2- Growing Rod treatment 3- At least one post operative wound infection (superficial, deep)

Results Thirty-four patients (10.3%) had a total of 58 infection events including 34 primary infections (24 deep, 10 superficial) and 24 recurring infection events.

Results The mean age at index surgery was 5.2 yrs and at 1st infection was 7.9 yrs Patients had a mean of 7.6 lengthenings (throughout the FU) At the time of infection, 11 patients had Titanium and 23 had stainless steel rods. Mean F/U was 31 m (10 m-123 m)

Results From 58 infection events, the most common presenting symptom was fever (26, 45%) followed by unexplained pain at the site of surgery or on the implant (21%) The most common sign of infection was skin problem over the incision (23, 40%) followed by wound drainage (11, 19%) and skin problem over the implants (9, 16%)

Results In 4 patients, rod had been exposed at the time of diagnosis of infection Four patients had radiographic signs of implant failure at the time of infection: 2 anchor loosening and 2 rod breakage Of those available lab data, ESR was > 20 mm in 82% and CRP was > 6 mg/L in 60% of first infections

Results Staphylococcus Aureus (SA) was the main organism isolated from wounds in both primary (22/34) and recurring infections (14/25). 14% (3) of primary SA infection (22) and 29% (4) of SA recurrences (14), were MRSA

Results Interval: Index GR to 1st infection= 37 m (20 d to 96 m) The most common perioperative antibiotics used was Cefazolin followed by Vancomycin. The mean length of antibiotic therapy was 22 days (IV) and 94 days (PO) following the primary infection

Results Of 58 infection events, 8 (14%) were treated medically and 50 (86%) surgically

Results Of 17 implant removals/exchanges, 10 (60%) had immediate or delayed replacement, 4 (24%) underwent final fusion and 3 (17%) were observed with no re-instrumentation.

Four y/o Boy with Arthrogryposis Sequence of events Index surgery First infection Second infection Third infection Fourth infection Course of Tx GR surgery I&D Partial removal of implant 08/19/2005 06/18/2007

Four y/o Boy with Arthrogryposis Patient is doing well after his latest successful lengthening 1/18/2010 9/26/2011

Limitations / Next Phase Retrospective, Short FU, missing data, Sample size Data clarification, Chronology, Definitions

In Summary Post operative wound infection after GR surgery is common and treatment is complex, often requiring multiple surgical interventions. Nearly 1/2 of the patients (44%) needed more than one surgical intervention to eradicate the infection. Rod removal/exchange was required in 47% of patients; however, implants were replaced in 60% of patients.

References 1- Hatlen, T; Song, K; Shurtleff, D; Duguay, S: Contributory Factors to Postoperative Spinal Fusion Complications for Children With Myelomeningocele Spine 2010; 35: 1294-1299 2- Cahill, PJ; Warnick, DE; Lee, MJ; Gaughan, J; Vogel, LE; Hammerberg, KW; Sturm, PF: Infection After Spinal Fusion for Pediatric Spinal Deformity: Thirty Years of Experience at a Single Institution. Spine 2010; 35:1211-1217 3- Ho, C; Skaggs, DL; Weiss, JM; Tolo, VT: Management of Infection After Instrumented Posterior Spine Fusion in Pediatric Scoliosis. Spine 2007; 32: 2739-2744 4- Rihn, JA; Lee, JY; Ward, WT: Infection After the Surgical Treatment of Adolescent Idiopathic Scoliosis: Evaluation of the Diagnosis, Treatment, and Impact on Clinical Outcomes. Spine 2008; 33: 289-294

Thank You The Growing Spine Foundation is supported primarily by donations from its surgeon members and also from unrestricted grants received either directly, or, through OREF by industry and other organizations, including K2M, DePuy Spine, Stryker Spine, Globus Medical and the Scoliosis Association of San Diego. The Growing Spine Foundation acknowledges the support and thanks all donors who supported its cause.