Safety and efficacy of waterproof casting for early onset scoliosis.

PURPOSE: The efficacy of traditional Mehta casting in the treatment of early onset scoliosis (EOS) is well-established. However, waterproof casting has not been previously described. Inherent advantages of waterproof casting include clearance for bathing/swimming, avoiding cast holidays, and improved family satisfaction. The purpose of this study was to assess the safety and efficacy of waterproof serial casting at controlling curve progression in EOS. METHODS: The current study is an IRB-approved Level IV retrospective consecutive cohort of EOS patients who underwent a serial 75% body weight traction-elongation-flexion Mehta cast protocol with waterproof cast padding. The addition of 3-point apical translation with stockinettes was utilized during casting. Bracing was initiated after correction < 15° or 1 year of serial casting. RESULTS: Seventeen patients at mean age 21.6 months, with pre-cast Cobb angle 52.3° (R: 35°-82°), underwent serial waterproof casting. In-cast correction index was 64%; for post-cast, Cobb angle was 18.6°. At mean 5.6 years follow-up (R: 2.3-8.9 years), 82% successfully avoided surgical intervention, 53% maintained correction < 25°, and 29% are considered "cured". 3/17 (18%) underwent a 2nd round of casting, and a total of 3/17 (18%) ultimately required surgery at 6.2 years post-casting. No major cast-related complications, decubiti, or cast holidays were encountered. CONCLUSION: Serial waterproof casting is safe and efficacious in EOS when compared to published results of traditional Mehta casting. Of 17 patients with mean pre-cast Cobb 52.3°, 82% successfully avoided surgery and 53% maintained mild curves < 25° magnitude at 5.6 years follow-up. No major complications or skin decubiti occurred, and advantages include clearance for bathing and avoidance of need for cast holidays during treatment. LEVEL OF EVIDENCE: Level IV.

Waterproof Hip Spica Casts for Pediatric Femur Fractures.

BACKGROUND: Hip spica casting is the treatment of choice for femur fractures in children ages 6 months to 5 years. Traditional spica (TS) casting utilizes cotton padding that precludes patient bathing. Waterproof (WP) casting has inherent advantages, including clearance for bathing and improved family satisfaction. This study examines the safety and efficacy of WP hip spica casting for the treatment of pediatric femur fractures. METHODS: This is a retrospective, matched cohort study of patients ≤5 years with a femur fracture treated with hip spica casting. Patients with WP casts were matched to patients with TS casts by age, sex, and fracture type. TS casts utilize a Goretex liner and cotton padding, while WP spicas utilize fully WP materials and can be completely submerged in water. RESULTS: Fifty patients were included (25 WP, 25 TS) without differences between cohorts in age, weight, or sex. There were no differences in operative time, length of stay, or length of time in cast. Patient charges were significantly lower in the WP group ($230 vs. $301, P <0.001). At cast-off, coronal/sagittal alignment and shortening were similar, while 9 TS patients had minor skin and/or cast complications that required outpatient repair versus only 1 WP patient ( P <0.001). CONCLUSIONS: In a matched comparison, WP spica casting significantly reduces skin and cast complications traditionally associated with cotton-based spica casting, with significantly lower charges for WP cast materials. Fracture healing rate, alignment, and shortening at cast-off are similar in WP versus TS casts. WP spica casting is safe and efficacious for pediatric femur fractures, with the inherent advantage of clearance for bathing. LEVEL OF EVIDENCE: Level 3.

Concave rod first vs. convex rod first in AIS instrumentation with differential rod contouring: computer modeling and simulations based on ten AIS surgical cases.

PURPOSE: To assess biomechanical differences between AIS instrumentations using concave vs. convex rod first. METHODS: Instrumentations of ten AIS patients were simulated first with major correction maneuvers using the concave rod then with convex rod. Correction maneuvers were concave/convex rod translation, followed by apical vertebral derotation and then convex/concave rod translation. The concave/convex rods were 5.5/5.5 and 6.0/5.5 mm diameter Co-Cr and contoured to 35°/15°, 55°/15°, 75°/15° and 85°/15°, respectively. RESULTS: Differences in simulated thoracic Cobb angle (MT), thoracic kyphosis (TK) and apical vertebral rotation (AVR) were less than 5° between the two techniques; mean bone-screw force difference was less then 15N (p > 0.1). Increasing differential contouring angle from 35°/15° to 85°/15°, the MT changed from 14 ± 7° to 15 ± 8°, AVR from 12 ± 4° to 6 ± 5°, TK from 23 ± 4° to 42 ± 4°, and bone-screw forces from 159 ± 88N to 329 ± 170N (P < 0.05). Increasing the concave rod diameter from 5.5 to 6 mm, the mean MT correction improvement for both techniques was less than 2°, the AVR correction was improved by 2°, the TK increased by 4° and bone-screw force increased by about 25N (p < 0.05). CONCLUSION: There was no significant difference in deformity corrections and bone-screw forces between the two techniques. Increasing differential contouring angle and rod diameter improved AVR and TK corrections with no significant effect on the MT Cobb angle. Although this study simplified the complexity of a generic surgical technique, the main effects of a limited number of identical steps were replicated for each case in a systematic manner to analyze the main first-order effects.

Biomechanical analysis of rod contouring in posterior spinal instrumentation and fusion for 3D correction of adolescent idiopathic scoliosis.

PURPOSE: To biomechanically evaluate 3D corrective forces and deformity correction attributable to key parameters of rod contouring in posterior spinal fusion (PSF) for adolescent idiopathic scoliosis (AIS). METHODS: Computerised patient-specific biomechanical models of six AIS cases were used to simulate PSF and evaluate the effects of 5.5-mm cobalt-chrome rod contouring angle (concave-convex angles: 30°-15°, 45°-15° and 60°-15°), length (spanning 4 and 7 vertebrae), and apex location (T7, T9). 3D correction and bone-implant forces were computed and analysed. RESULTS: By increasing the concave rod contour from 30° to 60°, thoracic kyphosis (TK) increased from 18° ± 2° (15°-19°) to 24° ± 2° (22°-26°), apical vertebra rotation (AVR) correction increased from 41% (SD8%) to 66% (SD18%) whilst the main thoracic curve (MT) correction decreased from 68% (SD6%) to 56% (SD8%). With a contouring length of 4 vs. 7 vertebrae, the resulting TK, AVR and MT corrections were 22° ± 1° (19°-26°) vs. 19° ± 10° (15°-22°), 57% (SD18%) vs. 50% (SD26%) and 59% (SD1%) vs. 69% (SD35%), respectively. With the rod contouring apex at T7 (vs. T9), AVR corrections were 69% (SD19%) vs. 44% (SD9%), with no significant difference in TK and MT corrections, and with comparatively 67% of screw pull-out forces. Corrective forces were more evenly shared with fixation on 7 vs. 4 vertebrae. CONCLUSION: Rod contouring of a greater angulation, over a shorter portion of the rod, and more centred at the apex of the main thoracic curve apex improved AVR correction and allowed greater restoration of TK, but resulted in significantly higher screw pull-out forces and came at the expense of less coronal plane correction.

Do Preoperative Supine Radiographs Predict Postoperative Residual Lumbar Curvatures in Adolescent Idiopathic Scoliosis? A Retrospective Cohort Study.

STUDY DESIGN: Retrospective comparative study. OBJECTIVES: This study compares supine vs bending flexibility radiographs and evaluates their ability to predict residual postoperative lumbar curvature after selective thoracic fusion for Lenke 1 and 2 curves across different lumbar modifiers (A, B, and C) in adolescent idiopathic scoliosis (AIS). METHODS: This was a retrospective review of AIS Lenke 1 and 2 patients who underwent posterior fusion. All patients had preoperative flexibility radiographs including side-bending and supine posteroanterior (PA) films, in addition to pre- and post-operative standing PA and lateral radiographs. We used SurgiMap 2.0 software for all radiographic measurements. Pearson correlations and linear regression models were developed in SAS. RESULTS: A total of 86 patients were included mean age 14.9 years and follow-up 72.3 months. Preoperative supine lumbar Cobb angle and preoperative side-bending Cobb angles had similar, positive correlations with postoperative lumbar Cobb angle, r = .55 (P < .001) and r = .54 (P < .001), respectively. Three regression models were built to predict postoperative lumbar Cobb angles from preoperative information: Model S (R2 = .39) uses preoperative supine lumbar curve; Model B (R2 = .44) uses preoperative side-bending lumbar curve; Model SB (R2 = .49) uses both preoperative supine and side-bending lumbar curves. Model S and B performed just as well as Model SB. CONCLUSION: Either supine or side-bending radiographs alone may be used to estimate mean residual postoperative lumbar curvature after selective posterior thoracic fusion, but little is to be gained by taking both supine and side-bending radiographs.

A microbiology study on the wounds of pediatric patients undergoing spinal fusion for scoliosis.

PURPOSE: Surgical site infection is a significant complication in posterior spinal fusion for scoliosis in pediatric and adolescent patients. Current literature demonstrates a lack of consensus regarding best prophylactic systemic and topical antibiotic regimens for reducing infection rates. This study aims to identify which common microbes are present at particular locations in the spine, and whether these are covered by our current systemic and topical antibiotic prophylaxis regimens. METHODS: A prospective observational study at a National Children's Hospital was conducted on 21 consecutive patients who underwent elective surgery for spinal deformity. Swabs were taken from four layers of the spine, including the superficial skin surface at the start of the case (after surgical site preparation with povidone-iodine), the deep dermis, and the deep surgical bed at the end of exposure and again after the corrective maneuver prior to closure. At each layer, swabs were taken from the proximal, middle, and distal portion of the wound. Swabs were sent to the laboratory for culture and susceptibility testing. RESULTS: Thirteen (62%) of patients had positive microbial growth. Two microbes were identified, Staphylococcus epidermidis (9.5% of patients) and Cutibacterium acnes (Propionibacterium acnes) (52% of patients). 100% of these microbes were sensitive to cefazolin and vancomycin. 3% of patients had positive growth at the skin layer, 32% positive at the dermal layer, 17% positive after exposure, and 40% positive at the conclusion of the case (p = 0.006). No difference was observed in microbial presence in the upper thoracic, lower thoracic and lumbar spine. CONCLUSION: Despite adequate surgical site preparation and sterile procedure, microbial contamination remains abundant in the dermal layer and deeper in the spinal wound throughout the case.

The Sagittal Plane in Spinal Fusion for Adolescent Idiopathic Scoliosis.

Sagittal balance is widely recognized as the primary determinant of optimal outcomes in adult spinal deformity. In adolescent idiopathic scoliosis (AIS), coronal correction risks being obtained at the expense of sagittal malalignment after posterior spinal fusion. Apical lordosis, often underestimated on two-dimensional imaging, is the primary deforming factor in AIS. Failure to restore thoracic kyphosis and lumbar lordosis during posterior spinal fusion contributes to problematic early surgical complications, including proximal or distal junctional kyphosis and failure. Although adolescent patients often compensate for sagittal imbalance in the short-term and mid-term, late sequelae of iatrogenic sagittal imbalance include flatback syndrome, disk degeneration, cervical kyphosis, and late decompensation. Objective criteria using spinopelvic parameters and preoperative three-dimensional planning can guide sagittal plane correction during PSF for AIS. Technical caveats can help avoid sagittal plane complications, including instrumentation level selection, anchor type, and anatomic protection of adjacent levels. Other surgical techniques to optimize restoration of thoracic kyphosis include higher implant density, stiffer rod material, Ponte osteotomies, and deformity correction technique.

Comparison of Outcomes by Reconstructive Strategy in Patients with Prostheses for Proximal Femoral Focal Deficiency.

BACKGROUND: The present study compares prosthetic treatment options for proximal femoral focal deficiency in terms of gait analysis, oxygen consumption, and patient-reported outcomes. METHODS: Twenty-three patients who had been managed with a prosthesis for unilateral proximal femoral focal deficiency underwent gait analysis; this group included 7 patients who had received an equinus prosthesis, 6 who had received a rotationplasty prosthesis, and 10 who had undergone Syme amputation and had received an above-the-knee prosthesis. Cadence parameters, kinematic and kinetic data, and oxygen consumption were measured, and the Gait Deviation Index (GDI) was calculated. Medical records and radiographs were reviewed. The Pediatric Outcomes Data Collection Instrument (PODCI) was completed by the child's parent. RESULTS: Patients underwent gait analysis at a mean age of 11.6 years (range, 4 to 19 years). Proximal femoral focal deficiency classification was not predictive of the chosen treatment. Patients in the rotationplasty group had undergone more procedures than those in the Syme amputation and equinus groups (mean, 3.3, 1.8, and 0.7 procedures, respectively) (p = 0.001). Oxygen cost did not differ between groups; however, all required greater energy expenditure than normal (170%, 144%, and 159%, in the equinus, rotationplasty, and Syme amputation groups, respectively) (p = 0.427). Likewise, hip power, abductor impulse, and GDI did not differ, but all groups had GDI scores >3 standard deviations below normative values. Patients in the equinus group walked faster (97% of normal for age) than those in the rotationplasty (84%) and Syme amputation groups (83%) (p = 0.018), whereas those in the Syme amputation group had superior knee range of motion (55° from the prosthetic knee) than those in the equinus (20°) and rotationplasty groups (15° generated from the ankle) (p = 0.003). There were no differences in terms of the PODCI subscales for pain, sport/physical function, happiness, or global function. Transfer/basic mobility improved with age (r = 0.516, p = 0.017), but no other associations were found between gait variables and PODCI scores. CONCLUSIONS: Rotationplasty provided no patient-reported benefit and no functional benefit in terms of gait parameters or oxygen consumption, despite requiring more surgical procedures compared with other prosthetic options. Patients with an equinus prosthesis walked the fastest, whereas treatment with a Syme amputation and prosthetic knee yielded equivalent gait parameters and oxygen consumption as compared with those for patients using an equinus prosthesis. These findings contradict those of previous reports that rotationplasty provides superior function over other proximal femoral focal deficiency prosthetic treatment options. LEVEL OF EVIDENCE: Therapeutic Level III. See Instructions for Authors for a complete description of levels of evidence.

Ponte osteotomies in a matched series of large AIS curves increase surgical risk without improving outcomes.

PURPOSE: The routine use of Ponte osteotomies in adolescent idiopathic scoliosis (AIS) surgery is controversial with conflicting data for coronal plane correction and little analysis in the sagittal plane. The objective of this study was to analyze the efficacy of Ponte osteotomies in large curve AIS. METHODS: A single institution, prospectively-collected series of consecutive AIS patients who had Ponte osteotomies (P cohort) was directly matched to patients with no Pontes (NP cohort) by age, gender, Lenke classification, surgeon, coronal, and sagittal Cobb angles. The radiographic review included adjusted values using a 3D-derived published formula for preoperative T5-T12 kyphosis. Patient-reported outcomes (PROs) were assessed with the SRS-30 and Spinal Appearance Questionnaire (SAQ). RESULTS: There were 68 patients (34/cohort) with minimum 2-year follow-up with no differences between P and NP cohorts in age, preoperative coronal Cobb (74.5° vs 70.8°), flexibility index, measured or 3D-adjusted T5-T12 kyphosis. Rod material/diameter, fusion levels, blood loss, and operative time did not differ, but implant density was higher in the P group (1.53 vs 1.31, p < 0.001). The P group had 7.9% greater coronal Cobb correction (66.6% vs 58.7%, p < 0.003) without difference in final Cobb angles (24.7° vs. 29.1°, p = 0.052). There were no differences in measured or adjusted T5-T12 kyphosis in the sagittal plane. The P group had a 15% rate of critical intraoperative neuromonitoring changes versus 0% in the NP group (p = 0.053). At follow-up, there were no differences in scoliometer measurements or any domain of SRS-30 or SAQ scores. CONCLUSION: In this first reported matched series of AIS patients, Ponte osteotomies provide small radiographic gains in the coronal plane with no improvement in the sagittal plane and no change in truncal rotation. There was a higher risk of critical intraoperative neuromonitoring changes, and no benefits in patient-reported outcomes. This calls into question the routine use of Ponte osteotomies in AIS, even for curves averaging 70 degrees. LEVEL OF EVIDENCE: II.

Willingness to enroll in a surgical randomized controlled trial: patient and parent preferences regarding implant density for adolescent idiopathic scoliosis fusion.

STUDY DESIGN: Prospective survey of adolescent idiopathic scoliosis (AIS) patients/parents with surgical magnitude curves. OBJECTIVE: We hypothesized that patients and families considering fusion surgery would be willing to enroll in a randomized controlled trial (RCT) evaluating the effect of number of implants on curve correction. Surgical RCTs are infrequently performed, particularly in a pediatric population. Parental willingness to enroll affects both study design and trial feasibility. The Minimize Implants Maximize Outcomes (MIMO) Clinical Trial proposes to randomize patients to more versus fewer screws (high or low density) for Lenke 1A curve patterns, but it is unclear whether families and patients are willing to enroll in such a trial. METHODS: This study was undertaken at 4 of the 14 sites participating in the MIMO Clinical Trial. AIS patients with Cobb > 45° were included. Implant density is defined as screws per level fused. Patients and families reviewed the MIMO education module describing proposed advantages and disadvantages of high (> 1.8) vs. low (< 1.4) density screw constructs and completed a custom survey regarding their preferences about the trial. RESULTS: 159 individuals were surveyed (78 families), including 82 parents/guardians, and 77 patients. Of those surveyed, 95% mostly or completely understood the trial (range 47-78%), and 63% agreed to enroll. Parents and patients who completely understood the trial were significantly more likely to enroll. CONCLUSION: Randomization in the MIMO Trial was acceptable to the majority (63%) of patients and parents. Clear patient and parent education materials and access to the surgeon may facilitate enrollment in the trial. Parents afforded the child much autonomy when considering enrollment, although most families agree both child and parent should be in agreement before entering the trial. LEVEL OF EVIDENCE: II.

Two AIS spine surgeries on the same day by the same surgeon: is performance and outcome the same for the second patient?

STUDY DESIGN: Retrospective case-controlled study. OBJECTIVES: To analyze the overall performance and outcome of two-a-day surgery days for adolescent idiopathic scoliosis (AIS). As a method to improve efficiency and operating room utilization, some surgeons are now performing two surgeries for AIS in a single day. METHODS: A prospectively collected series of AIS patients who underwent posterior spinal fusion on the same day as a second AIS patient by the same surgeon and surgical team were retrospectively reviewed. Patients who underwent same-day surgery (SD) were grouped according to whether they were the first (SD1) or second (SD2) case of the day and were matched (M1 and M2) by surgeon, curve magnitude, Lenke classification, and fusion levels. Comparisons were made: SD1 vs. SD2, SD1 vs. M1, and SD2 vs. M2. RESULTS: There were 56 patients, with no differences between groups in age, gender, BMI, or curve magnitude (66° vs. 62° vs. 65° vs. 63°). Surgical time was shorter for the SD1 group (17.2 min/level) compared to M1 (20.5 min/level) for a 15% operative time reduction of 44 min (p = 0.008). There were no differences between the groups in curve correction (65.8% vs. 62.8% vs. 66.1% vs. 58.5%), estimated blood loss (EBL), length of stay, or complication rate. One SD2 patient had a malpositioned screw that required revision. There were no other complications. CONCLUSIONS: When performing two AIS surgeries on the same day, surgical time was reduced by 44 min, or 15%, on the first case compared to a matched control. This may be a reflection of the team moving along more efficiently, given the full operative day scheduled. The performance measures of curve correction, EBL, complications, and length of stay did not decline in this new model, and no increased incidence of complications was seen.

Comparison of Vickers' Physiolysis With Osteotomy for Primary Correction of Clinodactyly.

Background: The purpose of this study was to compare the Vickers physiolysis procedure with osteotomy for correction of digital clinodactyly and determine which method provides better correction at final follow-up or whether the patient's age, preoperative angulation, or presence of syndactyly affects final outcomes. Methods: All patients of skeletal immaturity who underwent surgical correction of clinodactyly were evaluated with clinical examination and radiographs to determine the percentage and absolute change in the degree of clinodactyly pre- versus postoperatively, in addition to stratification based on the degree of deformity, age, and presence of syndactyly. Results: Vickers' physiolysis and osteotomy were undertaken in 30 and 11 digits, respectively. The angulation significantly improved from 43.0° to 23.9°, with a 46.2% correction of deformity in the Vickers group at 46.3 months. The angulation decreased from 39.2° to 22.4° in the osteotomy group, with a 55.3% correction of deformity at 55.3 months. There was better correction in those with isolated clinodactyly compared with those with concomitant syndactyly and better percentage of correction in patients with lesser deformity in the Vickers group. There were more reoperations in the osteotomy group. Conclusions: The use of osteotomy may lead to more revision cases, whereas the Vickers procedure has minimal complications and need for revision. The Vickers physiolysis procedure is more effective in those with angulation <55°.

Scoliosis Progression After the Nuss Procedure for Pectus Excavatum: A Case Report.

INTRODUCTION: Pectus excavatum and scoliosis are associated conditions with a high rate of coincidence. However, there are no reports to guide surgeons on the management of adolescents with moderate scoliosis and pectus excavatum, because there are conflicting conclusions in the literature regarding how the Nuss procedure with substernal bar affects scoliosis. CASES: In 2017, we encountered two patients with moderate scoliosis treated with a spinal orthosis. After undergoing the Nuss procedure for pectus excavatum, their scoliosis acutely progressed into surgical magnitude requiring posterior instrumented spinal fusion. The first patient progressed 26° despite the pre-Nuss radiographs showing him to be Risser 4/5, while the second patient also progressed 26° from the Nuss procedure. Both patients acknowledged noncompliance with brace wear because of discomfort after the Nuss procedure. However, their progression rate still doubles the rate of reported rapid accelerators, indicating that a significant component of curve progression is directly attributed to forces on the spine from the corrective maneuver with substernal bar. CONCLUSION: The purpose of this case report is to describe the features of these two patients to help with clinical decision-making in patients with moderate scoliosis (curves >25°) who are contemplating the Nuss procedure for correction of pectus excavatum. We caution patients and providers that spinal deformity could worsen with surgical intervention of the pectus excavatum via the Nuss procedure and necessitate scoliosis surgery.

Distal Junctional Failure Following Pediatric Spinal Fusion.

BACKGROUND: Adjacent segment pathology is a known complication after spinal fusion, but little has been reported on junctional failure. A series of adolescent patients presented with acute distal junctional failure (DJF). We sought to determine any common features of these patients to develop a prevention strategy. METHODS: A retrospective review was conducted of pediatric patients who developed DJF after instrumented spinal fusion performed at 2 institutions from 1999 to 2013. Patients with proximal junctional failure or junctional kyphosis without failure were excluded. RESULTS: Fifteen subjects were identified with mean follow-up of 38 months. Distal failure occurred a mean of 60 days after index surgery, with history of minor trauma in 4 patients. Failures included 3-column Chance fracture (11) or instrumentation failure (4). Thirteen patients presented with back pain and/or acute kyphosis, whereas 2 asymptomatic patients presented with healed fractures. Two patients also developed new onset of severe lower extremity neurological deficit after fracture, which improved but never resolved after revision. A total of 13/15 subjects required revision surgery, typically within 1 week. Complications associated with revision surgery were encountered in 8 patients (62%). Major complications that required return to the operating room included 2 deep infections, 2 instrumentation failures, and dense lower extremity paralysis that improved after medial screw revision and decompression. At final follow-up, 10 patients are asymptomatic, 2 have persistent neurological deficit, 2 have chronic pain, and 1 has altered gait with gait aid requirement. CONCLUSIONS: This study analyzes a heterogenous cohort of spinal fusion patients who developed DJF from 3-column Chance fracture or instrumentation failure. Revision surgery is typically required, but has a high complication rate and can result in severe neurological deficit, highlighting the morbidity of this complication. It is unclear whether level of the lowest instrumented vertebra contributes to DJF. Increased awareness of junctional failure in children may prompt additional studies to further characterize risk factors and preventative strategies. LEVEL OF EVIDENCE: Level IV-study-type case series.

Which Malpositioned Pedicle Screws Should Be Revised?

BACKGROUND: Up to 10% of free-hand pedicle screws are malpositioned, and 1 in 300 patients may undergo return to surgery for revision of malpositioned screws. The indications for revision of asymptomatic malpositioned screws have not been carefully examined in the literature. We sought to evaluate the threshold among spinal deformity surgeons for revision of malpositioned screws. METHODS: Twelve experienced spine surgeons reviewed x-ray and computed tomographic images of 32 malpositioned pedicle screws with variable degrees of anterior, medial, and lateral breeches. The surgeons were asked whether based on the image they would revise the screw: (1) intraoperatively before rod placement; (2) intraoperatively after rod placement; (3) in clinic with an asymptomatic patient. For each scenario, we assumed stable neuromonitoring and no neurological changes. Agreement and multirater κ was calculated. RESULTS: There was good agreement as to which screws were malpositioned (80% agreement, κ=0.703). After the rod was placed or postoperatively (scenarios 2 and 3), surgeons less frequently recommended screw revision, and there was greater variability among the surgeons' recommendations. For return to surgery from clinic for asymptomatic screw revision, % agreement was only 65% (κ=0.477). The majority recommended revision surgery for screws which approached the dura (10/12) or the aorta (7/12 surgeons). Half of the surgeons recommended revision surgery for an asymptomatic screw if the entire screw diameter was in the canal. Revision surgery was not recommended for asymptomatic patients with screws partially violating the canal (<½ the screw diameter), malpositioned laterally in the rib head, or with small anterior cortical violations remote from a vascular structure. CONCLUSIONS: There is significant variability of opinion among surgeons regarding which malpositioned screws can be safely observed in an asymptomatic patient. Given the frequency of malpositioned screws and morbidity of surgical return to surgery, more long-term data are needed to develop practice guidelines for determining which screws require revision surgery. LEVEL OF EVIDENCE: Level III-retrospective comparative study.

Delayed Dural Leak Following Posterior Spinal Fusion for Idiopathic Scoliosis Using All Posterior Pedicle Screw Technique.

BACKGROUND: In pediatric patients, pedicle screws are malpositioned 5% to 15% of the time. Complications associated with malpositioned screws are infrequently reported in the literature. We present a series of adolescent idiopathic scoliosis (AIS) patients who presented in a delayed manner with positional headache and chronic dural leak adjacent to the pedicle screw tract. METHODS: Scoliosis databases at 2 centers were reviewed, and cases of delayed positional headaches following posterior spinal fusion for AIS were identified. Demographic and clinical data were collected. RESULTS: Of 322 patients, 4 patients presented with positional headaches at a mean of 12.8 weeks following posterior spinal fusion surgery for AIS, with an interval time to diagnosis of 5 months. Computed tomographic myelogram demonstrated severe pedicle screw malposition in 1 patient, and minimal malposition in 3 patients (<2 mm violation). The patients had delayed presentation with positional headaches secondary to dural leak. All patients successfully underwent revision surgery with repair of the dural leak. At the time of latest follow-up, all patients are asymptomatic. CONCLUSIONS: Pedicle screw malposition can result in dural leaks. Patients may present in a delayed manner with positional headaches and an acquired Chiari malformation. Clinical suspicion should prompt imaging of the brain or cervical spine followed by computed tomographic myelogram to determine site of leak. This is a rare complication from pedicle screw malposition. LEVELS OF EVIDENCE: Level IV-case series.

Revision Total Hip Arthroplasty Using the Cement-in-Cement Technique.

The cement-in-cement technique is useful in the setting of revision total hip arthroplasty (THA), especially to gain acetabular exposure, change a damaged or loose femoral component, or change the version, offset, or length of a fixed femoral component. The goal of this retrospective study was to assess the clinical and radiographic characteristics of revision THA using the cement-in- cement technique. Between 1971 and 2013, a total of 63 revision THAs used an Omnifit (Osteonics, Mahwah, New Jersey) or Exeter (Howmedica, Mahwah, New Jersey) stem and the cement-in-cement technique at the senior author's institution. Aseptic loosening (74%) was the predominant preoperative diagnosis followed by periprosthetic fracture (14%), instability (8%), and implant fracture (6%). Mean clinical follow-up was 5.5±3.8 years. The Harris Hip Score had a statistically significant increase of 18.5 points (P<.001) after revision THA using the cement-in-cement technique. There were 13 returns to the operating room, resulting in an overall failure rate of 21%. Eleven (18%) cases required revision THA, but only 1 (2%) revision THA was for aseptic removal of the femoral component. All other femoral implants had no evidence of component migration, cement mantel fracture, or circumferential lucent lines at final follow-up. The patients who underwent cement-in-cement revision THA at the senior author's institution had good restoration of function but a high complication rate. [Orthopedics. 2017; 40(2):e348-e351.].

Surgical Site Infections After Pediatric Spine Surgery.

Surgical site infection (SSI) after spinal deformity surgery is a complication in the pediatric population resulting in high morbidity and cost. Despite modern surgical techniques and preventative strategies, the incidence remains substantial, especially in the neuromuscular population. This review focuses on recent advancements in identification of risk factors, prevention, diagnosis, and treatment strategies for acute and delayed pediatric spine infections. It reviews recent literature, including the best practice guidelines for infection prevention in high-risk patients. Targets of additional research are highlighted to assess efficacy of current practices to further reduce risk of SSI in pediatric patients with spinal deformity.