The Season of Hoverboards: A Case Series of Fractures.

OBJECTIVE: The aim of this study was to identify the types of pediatric orthopedic extremity fractures that are sustained as a result of hoverboard (self-balancing, self-propelling, 2-wheeled boards) use. METHODS: We performed a retrospective review of all orthopedic consultations from the emergency department at our institution from December 1 to 31, 2015. Data was collected on the injury mechanism, fracture location, management, and patient characteristics including sex, age, and hand dominance. RESULTS: A total of 307 patients with acute extremity injuries were evaluated for a 31-day period. Hoverboard use was identified as the mechanism of injury in 36 patients with 36 fractures (11.7%). The mean age of these 36 patients was 11 years (range, 4-17 y), with most being male (69.4%). There were 35 upper extremity fractures and 1 lower extremity fracture. Eight (22.9%) of the 36 hoverboard patients required closed reduction in the emergency department either under conscious sedation or hematoma block performed with local anesthetic. Four patients (11.1%) required operative treatment. CONCLUSIONS: The overall incidence of extremity fractures due to hoverboard riding seen in our emergency department during the holiday season was relatively high compared with other common childhood activities. The vast majority of these fractures involved the upper extremities. A moderate percentage of these injuries required closed reduction in the emergency department or surgical treatment. Additional studies examining the use of protective equipment while riding hoverboards, time from initial hoverboard use to injury, supervision, and the cost of treating these injuries should be conducted to further elucidate the nature of these injuries and work toward prevention.

A protocol for the management of pediatric type I open fractures.

BACKGROUND: The management of pediatric type I open fractures remains controversial. There has been no consistent protocol established in the literature for the non-operative management of these injuries. METHODS: A protocol was developed at our institution for the non-operative management of pediatric type I open forearm fractures. Each patient was given a dose of intravenous antibiotics at the time of the initial evaluation in the emergency department. The wound was then irrigated and a closed reduction performed in the emergency department. The patient was admitted for three doses of intravenous antibiotics (over approximately a 24-h period) and then discharged home without oral antibiotics. RESULTS: In total, 45 consecutive patients were managed with this protocol at our hospital between 2004 and 2008. The average age was 10 (range 4-17) years. The average number of doses of intravenous antibiotics was 4.06 per patient. Thirty patients (67 %) received cefazolin (Ancef®) as the treating medication and 15 patients received clindamycin (33 %). There were no infections in any of the 45 patients. CONCLUSION: In this study we outline a consistent management protocol for type I open pediatric forearm fractures that has not previously been documented in the literature. Our results corroborate the those reported in the literature that pediatric type I open fractures may be managed safely in a non-operative manner. There were no infections in our prospective series of 45 consecutive type I open pediatric forearm fractures using our protocol. Using a protocol of only four doses of intravenous antibiotics (one in the emergency department and three additional doses during a 24-h hospital admission) is a safe and efficient method for managing routine pediatric type I open fractures non-operatively.

The biomechanics of guided growth: does screw size, plate size, or screw configuration matter?

Guided growth with the eight-plate is a commonly used technique to correct angular limb deformities in children. However, the optimal combination of plate size, screw size, and screw configuration has not been determined. Using osteotomized femoral sawbones and a rail frame, we developed a growth model to examine the effect of these variables at 6-month, 12-month, and 18-month growth increments. The mean annual coronal plane change was 11.3°. Screw size and plate size were not associated with the rate of angular correction. Screw configuration was important, with parallel screws resulting in optimal correction at all time points compared with divergent screws (P<0.05).

Septic arthritis associated with closed intra-articular fracture: a case series.

BACKGROUND: Osteomyelitis in the setting of closed fractures is a recognized association in the literature, but to our knowledge, septic arthritis after a closed intra-articular fracture has not yet been reported. METHODS: We conducted a retrospective review of 3 cases of septic arthritis after closed intra-articular fractures of the proximal phalanx of the great toe, distal tibia, and distal humerus. RESULTS: The patients presented with fever, erythema, pain, and elevated infectious indices. All patients had a delay in diagnosis of up to 10 days. On diagnosis, all patients underwent open irrigation and debridement and were treated with organism-specific antibiotics for Staphylococcus aureus or Streptococcus pneumoniae. One patient required metatarsophalangeal joint arthrodesis, whereas the other 2 patients returned to full function after a prolonged treatment course. CONCLUSIONS: Septic arthritis after closed intra-articular fracture is a rare clinical condition and requires prompt diagnosis and treatment. LEVEL OF EVIDENCE: Level IV.

Access to care for children with fractures.

BACKGROUND: Earlier studies have found that children with fractures and PPO insurance have no access problems to orthopaedic care, but children with Medicaid have problems with access to orthopaedic care. METHODS: Fifty randomly selected orthopaedic offices in each of the 2 counties served by a children's hospital were telephoned to seek an appointment for a fictitious 10-year-old boy with a forearm fracture. Each office was called twice, 1 time reporting that the child had PPO insurance and 1 time that he was having Medicaid. In the second arm of the study, data including insurance status were prospectively collected on all patients with fractures seen in the emergency department of children's hospital. RESULTS: Of the 100 offices telephoned, 8 offices gave an appointment within 1 week to the child with Medicaid insurance. Thirty-six of the 100 offices gave an appointment within 1 week to the child with PPO insurance. For the 2210 pediatric fractures seen in the emergency department, the payer mix for patients presenting initially to our facility (1326 patients) was 41% Medicaid, 9% selfpay, and 50% commercial. For the patients presenting to our emergency department after being seen at an outside facility first (884 patients), the payer mix was 47% Medicaid, 13% self-pay, and 40% commercial. The percentages between these two groups were similar but did have a statistically significant difference (P=0.021). CONCLUSIONS: To the best of our knowledge, this is the first study that reports a majority (64/100) of orthopaedic offices in the region would not care for a child with a fracture regardless of insurance status. Consistent with earlier studies, children with Medicaid have less access to care. The similar insurance status of children sent to the emergency department from other facilities compared with those presenting directly suggests that children in this study are sent to a children's hospital for specialized care rather than for economic reasons. LEVEL OF EVIDENCE: Level II.

The healing forearm fracture: a matched comparison of forearm refractures.

BACKGROUND: Forearm fractures in children usually heal rapidly after closed treatment. Recent studies report forearm refracture rates of 5%. The purpose of this study was to identify risk factors for refracture based on radiographic variables. METHODS: We performed a retrospective review of patients that sustained a second forearm fracture (refracture) between 1998 and 2005. Refractures were defined as having a second fracture of the same forearm within 18 months of the original fracture. A comparison group of single-fracture patients followed in a capitated insurance plan were included and matched based on age and sex. Radiographic assessment included initial/final angulation, displacement, and fracture-line visibility at latest follow-up. RESULTS: Sixty-three refractures were compared with 132 age- and sex-matched single-fracture patients. Time to refracture averaged 10 months. Thirty-eight percent of the initial fractures in the refracture group occurred in the proximal or middle third of the forearm compared with 15% for the single-fracture patients (P < 0.001). Because location of the fracture was found to be a risk factor for refracture, a secondary analysis was performed with refracture patients matched to single-fracture patients based on age, sex, bone fractured, fracture location, and treatment method. Fracture-line visibility of the radius at latest follow-up was clearly visible in 48% of refractures compared with 21% of controls (P = 0.05). Initial fracture severity and residual deformity were not significantly different. CONCLUSIONS: Proximal and middle one third forearm fractures are at greater risk of refracture compared with distal one third forearm fractures. There was a trend toward incomplete healing seen more commonly in those that refractured, emphasizing the importance of longer immobilization in these fractures. LEVEL OF EVIDENCE: Prognostic study, level III, case-control study.

Human lumbar facet joint capsule strains: I. During physiological motions.

BACKGROUND CONTEXT: The lumbar facet joint capsule is innervated with nociceptors and mechanoreceptors, and is thought to play a role in low back pain as well as to function proprioceptively. PURPOSE: In order to examine the facet capsule's potential proprioceptive role, relationships between intracapsular strain and relative spine position were examined. STUDY DESIGN/SETTING: Lumbar facet joint capsule strains were measured in human cadaveric specimens during displacement-controlled motions. METHODS: Ligamentous lumbar spine specimens (n=7) were potted and actuated without inducing a moment at the point of application. Spines were tested during physiological motions of extension, flexion, left and right lateral bending. Intervertebral angulations (IVA) were measured using biaxial inclinometers mounted on adjacent vertebrae. Joint moments were determined from the applied load at T12 and the respective moment arms. Capsule plane strains were measured by optically tracking the displacements of infrared reflective markers glued to capsule surfaces. Statistical differences (p<.05) in moment, IVA and strain were assessed across facet joint levels using analysis of variance and comparison of linear regressions. RESULTS: The developed moments and IVAs increased monotonically with increasing displacements; the relationships were highly correlated for all four motion types. Although highly variable among specimens, principal strains also increased monotonically in magnitude with increasing displacements during extension and flexion, but were more complex during lateral bending. At a given joint level, the absolute magnitudes of principal strains and IVA were largest during the same motion type. CONCLUSIONS: Distinct patterns in principal strains and IVA were identified during physiological motions, lending biomechanical support to the theory that lumbar facet joint capsules could function proprioceptively.

Human lumbar facet joint capsule strains: II. Alteration of strains subsequent to anterior interbody fixation.

BACKGROUND CONTEXT: In cases of low back pain associated with biomechanical lumbar instability, anterior interbody fixation can be used as a surgical treatment, but its affect on facet joint capsule strains is unknown. PURPOSE: To determine the effect of a single-level anterolateral interbody fixation, the changes in lumbar facet joint capsule strains at the level of and adjacent to the fixation were evaluated. STUDY DESIGN/SETTING: Human cadaveric lumbar spine specimens were tested under displacement control before and after the addition of a single anterior thoracolumbar plate (ATLP) on the L4-L5 motion body. METHODS: Ligamentous lumbar spine specimens (n=7) were potted and actuated before and after fixation of the L4-L5 motion segment with an ATLP in motions of extension, flexion, left and right bending. Joint moments were calculated from the applied load and respective moment arms. Intervertebral angulation was measured using biaxial inclinometers mounted onto adjacent vertebrae. Plane strains of the capsules were measured by optically tracking the displacements of small, infrared reflective markers glued to capsule surfaces. Statistical differences (p<.05) in moment, intervertebral angle and capsular strain were assessed using analysis of variance and comparison of linear regression lines. RESULTS: Fixation resulted in an increase in moment at the three vertebral levels for all motions. There was also an increase in intervertebral angle at L3-L4 and L5-S1, and a decrease in intervertebral angle at L4-L5 for all motions. Plane strains in the L3-L4 and L5-S1 facet capsules increased as a result of the fixation. L4-L5 facet capsules experienced decreased and increased strains ipsilateral and contralateral, respectively, to the instrumentation. CONCLUSION: Restriction of a vertebral motion segment using a single ATLP increased adjacent capsular strains, which if suprathreshold for capsule nociceptors, could play a role in low back pain.