Hospital transfer and delayed reduction of traumatic hip dislocations.

INTRODUCTION: Native hip dislocations are high energy injuries that cause substantial patient morbidity. Expedient reduction has been demonstrated to improve patient outcomes. The objective of our study was to compare complication rates in patients with native hip dislocations who presented directly to a level-one trauma center with those transferred from an outside hospital (OSH). Our hypothesis was that those transferred from an OSH would experience a delay in reduction and subsequently would experience higher rates of avascular necrosis (AVN), post-traumatic arthritis (PTA), and need for secondary surgery. MATERIAL AND METHODS: We conducted a retrospective chart review of all native hip dislocations from our level-one trauma center between January 2007 and December 2020. The initial query resulted 628 patients which was refined to 90 patients after excluding patients for incorrect diagnosis code or less than 6 months of follow-up. Our primary outcome was the development of AVN, PTA, and need for secondary surgery. Time from injury to reduction was recorded for all patients included. RESULTS: For every one hour of delay in time to reduction, there was a 3.4% increase in the risk of developing AVN (p = 0.004) and a 4.3% increase in risk for developing PTA (p = 0.01). The risk of requiring a secondary surgery increased 4.6% for each hour of delay in reduction (p = 0.03). The average time to reduction of transferred patients was higher compared to those who presented directly to our center (13.8 h vs 5.7 h); however, transfer status was not found to be an independent risk factor for the measured outcomes. CONCLUSIONS: Transfer status is not an independent risk factor for the development of AVN, PTA, or the need for a secondary surgery. However, transferred patients did experience an average delay of 8 h in time to reduction compared to those who presented directly to a trauma center. Of the 27 patients with a reduction delay greater than 12 h, 26 (96%) were transferred.

Evaluation for septic arthritis of the native adult knee is aided by multivariable assessment.

INTRODUCTION: Evaluation of suspected septic arthritis of the native adult knee is a common diagnostic dilemma. Pre-aspirate criteria predictive of septic arthritis do not exist for the adult knee and investigations of aspiration results (cell count, differential, gram stain and crystal analysis) have been limited to univariate analyses. Given numerous clinical variables inform the risk of septic arthritis, multivariable analysis that incorporates all clinically available information is critical to allowing accurate decision-making. METHODS: We retrospectively identified 455 cases of potential septic arthritis of a native adult knee at a tertiary health system from 2012 to 2017, of which 281 underwent aspiration. We recorded demographics, comorbidities, history, exam, laboratory, and radiographic data. Among aspirated cases, we performed univariate analyses of all variables for association with septic arthritis followed by multivariable logistic regression analysis. RESULTS: Septic arthritis was confirmed in 61 of 281 patients who underwent aspiration. Independent associations of risk for septic arthritis included synovial fluid WBC ≥ 30,000 (Odds Ratio 90.8, 95% Confidence Interval 26.6-310.1, p < 0.001), bacteria reported on synovial fluid gram stain (OR 21.5, 95% CI 3.9-119.2, p < 0.001), duration of pain >2 days (OR 6.9, 95% CI. 2.3-20.9, p < 0.001), history of septic arthritis at any joint (OR 5.0, 95% CI 1.1-23.4, p = 0.039), clinical effusion (OR 4.8, 95% CI 1.2-20.0, p = 0.030). Independent associations protective against septic arthritis included presence of synovial fluid crystals (OR 0.1, 95% CI 0.1-0.4, p < 0.001). The multivariable model was highly accurate in discriminating between septic and aseptic cases (AUC = 0.942). A web-based tool was created to aid clinical decision-making. CONCLUSION: When evaluating for septic arthritis of a native adult knee, several independent associations were identified for variables related and unrelated to joint aspiration. The associated multivariable model discriminated very well between patients with and without septic arthritis, outperforming previous univariate assessments. A web-based tool was created that estimates the probability of septic arthritis based on this model. This may aid decision-making in complex clinical scenarios.

Irreducible ankle fracture-dislocation due to tibialis anterior subluxation: a case report.

Irreducible ankle fracture-dislocations are rare. Several cases of irreducible ankle fracture-dislocation have been reported in published studies secondary to the tibialis posterior tendon, deltoid ligament, or extensor digitorum longus tendon blocking the reduction. We report a case of irreducible ankle fracture-dislocation resulting from posteromedial subluxation of the tibialis anterior tendon around a medial malleolar fracture fragment. Ultimately, the ankle required open reduction of the incarcerated tendon to reduce the joint and proceed with internal fixation of the associated fracture. The patient's postoperative course was uncomplicated, and the tibialis anterior tendon was functioning at 10 months postoperatively, after which he did not return for follow-up examinations. To our knowledge, this is the first reported case of the tibialis anterior tendon blocking closed reduction of an ankle fracture-dislocation.

Intramedullary Free Gracilis for Dead-Space Obliteration and Stump Resurfacing in a Transfemoral Amputee With Recurrent Osteomyelitis.

Background: A 72-year-old man with a history of delayed presentation for severe right lower extremity burns underwent through-knee amputation complicated by periprosthetic distal femur osteomyelitis. Subsequent transfemoral amputation was complicated by Stage IVB Cierny-Mader osteomyelitis despite appropriate medical and surgical treatment. Methods: Due to the presence of threatened proximal femur intramedullary nail from prior intertrochanteric femur fracture, inability to further shorten femur, and lack of local soft-tissue options, we performed soft tissue reconstruction with free gracilis flap. The free gracilis flap was pulled proximally through the femoral canal to obliterate intramedullary dead space and provide distal femoral stump coverage. Results: The stump was fully healed upon 6-month follow-up with computerized tomography demonstrating continued presence of gracilis flap within the femoral canal and no evidence of osteomyelitis. At 1-year follow-up, the patient was ambulatory using a prosthetic without recurrence of osteomyelitis. Conclusions: Previous descriptions of intramedullary free muscle flaps for the treatment of osteomyelitis are limited in number, with its function being limited to dead-space obliteration. This report presents intramedullary free gracilis flap to be a viable option in above-knee amputees for combined dead space obliteration and stump resurfacing in the context of recurrent osteomyelitis.

Proximal fracture line extension in humeral shaft fractures.

Introduction: Humeral shaft fractures are common injuries treated by orthopaedic surgeons. The purpose of this study is to evaluate displaced diaphyseal humerus fractures and describe the incidence and characteristics associated with non or minimally displaced fracture line extension into the proximal metadiaphyseal region of the humerus. Methods and materials: All adult patients with diaphyseal humeral shaft fractures located within the distal two-thirds of the humeral shaft, treated at a single level I trauma institution between 2007 and 2020, were retrospectively identified. 202 patients with 203 fractures of the humeral shaft were included. Fracture patterns were classified according to AO/OTA classification and fracture line extension into the proximal metadiaphyseal region was evaluated on radiographs. Patient demographics, management details, and radiographic outcomes were obtained from review of the electronic medical record. Results: Of 203 diaphyseal humerus fractures, 11.8 % (n = 24) had non or minimally displaced proximal extension of their main fracture line. This included 43.7 % (n = 7) of all proximal third junction diaphyseal fractures, 10.7 % (n = 16) of all middle third diaphyseal fractures, and 2.6 % (n = 1) of all distal third diaphyseal fractures. Patients with proximal fracture extension were, on average, older (61.7 versus 44.4 years, p < 0.001), and a higher percentage were female (75 % versus 45.5 %, p < 0.01) compared to patients without fracture proximal extension. Fractures with proximal extension were all closed fractures (n = 24), were more often sustained from low-energy fall (87.5 % versus 35.2 %, p < 0.001), and were more often spiral type fractures (62.5 % versus 17.2 %). Fractures with proximal extension were more often treated non-operatively (58.3 % versus 42.1 %, p < 0.01), but were found to have a higher rate of nonunion after non-operative treatment (17.6 % versus 8.1 %) compared to fractures without proximal extension. All operatively treated fractures that had proximal metaphyseal extension were secured with a fixation construct to achieve fixation proximal to the extent of the fracture line, most often into the humeral head and neck. Operative management with proximal fixation into the humeral head was also pursued for a patient with nonunion, including persistent lucency of the proximal extension line, after failed non-operative treatment. Mean follow-up was 35.5 weeks (range: 0-607 weeks). Conclusions: Proximal fracture line extension in the setting of diaphyseal humerus fractures is not uncommon. Detection and consideration of this sometimes subtle finding is important when planning to treat these injuries operatively.

Sagittal deformity of Garden type I and II geriatric femoral neck fractures is frequently misclassified by lateral radiographs.

The objective of this study was to determine the validity and inter-rater reliability of radiographic assessment of sagittal deformity of femoral neck fractures. Design: This is a retrospective cohort study. Setting: Level 1 trauma center. Patients/Participants: Thirty-one patients 65 years or older who sustained low-energy, Garden type I/II femoral neck fractures imaged with biplanar radiographs and either computed tomography or magnetic resonance imaging were included. Main Outcome Measurements: Preoperative sagittal tilt was measured on lateral radiographs and compared with the tilt identified on advanced imaging. Fractures were defined as "high-risk" if posterior tilt was ≥20 degrees or anterior tilt was >10 degrees. Results: Of 31 Garden type I/II femoral neck fractures, advanced imaging identified 10 high-risk fractures including 8 (25.8%) with posterior tilt ≥20 degrees and 2 (6.5%) with anterior tilt >10 degrees. Overall, there was no significant difference between sagittal tilt measured using lateral radiographs and advanced imaging (P = 0.84), and the 3 raters had good agreement between their measurements of sagittal tilt on lateral radiographs (interclass correlation coefficient 0.79, 95% confidence interval [0.65, 0.88], P < 0.01). However, for high-risk fractures, radiographic measurements from lateral radiographs alone resulted in greater variability and underestimation of tilt by 5.2 degrees (95% confidence interval [-18.68, 8.28]) when compared with computed tomography/magnetic resonance imaging. Owing to this underestimation of sagittal tilt, the raters misclassified high-risk fractures as "low-risk" in most cases (averaging 6.3 of 10, 63%, range 6 - 7) when using lateral radiographs while low-risk fractures were rarely misclassified as high-risk (averaging 1.7 of 21, 7.9%, range 1 - 3, P = 0.01). Conclusions: Lateral radiographs frequently lead surgeons to misclassify high-risk sagittal tilt of low-energy femoral neck fractures as low-risk. Further research is necessary to improve the assessment of sagittal plane deformity for these injuries. Level of Evidence: Level IV diagnostic study.

Accuracy of Radiographic Displacement Measurement in a Pelvic Ring Injury Model.

BACKGROUND: Pelvic ring injury outcome studies rely on radiographic assessment. To date, no study investigates the accuracy of radiographic measurement. The aim of this study was to assess the accuracy and interobserver reliability of pelvic ring displacement measurement in an injury model. We hypothesize that current radiographic measurement methods do not accurately quantify the three-dimensional pelvic ring displacement. METHODS: Ten orthopaedic traumatologists evaluated 12 pelvic ring injury model displacements using AP, inlet, and outlet radiographs and axial CT images. Observers completed a survey of demographic and treatment approach strategies. Radiographic displacement measurements in axial, coronal, and sagittal planes were analyzed for accuracy using. Absolute displacement measurements were categorized with Matta and Tornetta grading system for Fleiss Kappa inter-reliability correlation evaluation. RESULTS: The mean age of orthopaedic traumatologists was 47.5 years (range 36 to 59) with a mean 15.3 years (range 4 to 27) of pelvic fracture surgery experience. Radiographic measurement of isolated uniplanar of pelvic displacement in axial, sagittal, or coronal plane alone was more accurate than multiplanar pelvic displacements with more than one plane of displacement, 6.6 ± 5.7 mm error compared with 9.6 ± 6.3 mm error, respectively (P = 0.0035). Measurement accuracy was greater with isolated coronal plane (4 ± 3.5 mm error) compared with isolated axial plane (9.9 ± 7.1 mm error) or isolated sagittal plane displacement (6.7 ± 4 mm error). Interrater reliability for the radiographic displacement measurement by observers showed an overall poor agreement with 0.24. CONCLUSION: Radiographic displacement measurement in these modeled pelvic ring injuries has notable inaccuracy among various measurement methods. Coronal and sagittal plane radiographic displacement measurements are more accurate compared with axial plane measurement. The reporting of radiographic displacement measurement outcomes in clinical research studies should be critically evaluated, and standardization of pelvic ring injury displacement may not be achievable with radiography. LEVEL OF EVIDENCE: Level V.

Clinical and Radiographic Predictors of Nonunion in Open Tibial Shaft Fractures.

Open fracture is a risk factor for nonunion of diaphyseal tibia fractures. Compared with closed injuries, there is a relative lack of scientific knowledge regarding the healing of open tibia fractures. The objective of this study was to investigate which patient, injury, and surgeon-related factors predict nonunion in open tibial shaft fractures. A cohort of 98 patients with 104 extra-articular open tibial shaft fractures (OTA/AO 41A2-3, 42A-C, and 43A) were treated surgically between 2007 and 2018 at a single level 1 trauma center and were retrospectively reviewed. Patients underwent irrigation and debridement followed by definitive intramedullary nailing or plate fixation. Patient, injury, and perioperative prognostic factors were analyzed as predictors of nonunion based on anteroposterior and lateral radiographs. The nonunion rate was 27.9% (n=29). There were 12 occurrences of deep infection (11.5%). The median follow-up was 14 months. High-energy mechanism of injury (hazard ratio [HR], 5.76), Gustilo-Anderson class IIIA injury (HR, 3.66), postoperative cortical continuity of 0% to 25% (HR, 2.90), early postoperative complication (HR, 4.20), and deep infection (HR, 2.25) were significant predictors of nonunion on univariable analysis (P<.05). On multivariable assessment, only high-energy mechanism of injury, Gustilo-Anderson class IIIA injury, and early postoperative complication reached significance as predictors of nonunion. These data also indicate that lack of cortical continuity is a significant univariable radiographic predictor of nonunion. This is potentially modifiable, may guide surgeons in selecting patients for early bone grafting procedures, and should be assessed carefully in this high-risk population. [Orthopedics. 2021;44(3):142-147.].

Minimally Invasive Medial Plate Osteosynthesis of High-Energy Pediatric Tibia Fractures.

OBJECTIVES: We report on the largest series to date of minimally invasive medial plate osteosynthesis of high-energy tibia fractures in skeletally immature patients. DESIGN: Retrospective. SETTING: Level 1 trauma center. PATIENTS: Skeletally immature patients with high-energy tibia fractures treated with minimally invasive medial plate osteosynthesis between 2006 and 2017. We identified 28 fractures in 26 patients. MAIN OUTCOME MEASURE: We reviewed the record for patient, injury, and treatment factors as well as for complications and reoperation. We assessed the relationships between age, implant selection, and implant removal using χ and t test analyses. RESULTS: Mean age was 12 years (4-15) with OTA/AO classifications including 42A (18), 42B (6), and 42C (4). There were 10 open fractures (1 type I, 2 type II, and 7 type III). Mean follow-up was 37.6 months (minimum 7). Mean time to full weight-bearing and union was 2 and 3 months, respectively. Plate stock (2.7, 3.5, and 4.5 mm) and length (6-20 holes) varied independent of age, P = 0.19. There were 2 superficial infections, one 15 mm leg length discrepancy, and one case of fasciotomy at the time of plate fixation for trauma-related compartment syndrome. Implant removal was more likely in younger patients (10.9 vs. 13.2 years, P = 0.04) and not associated with plate stock, P = 0.97. There were no neurovascular injuries, losses of reduction, or rotational deformities. Angulation was universally <5 degrees in the coronal plane and <10 degrees in the sagittal plane. CONCLUSIONS: Minimally invasive medial plate osteosynthesis of high-energy pediatric tibia fractures may be performed with a low rate of complications and should be considered in this select patient population with multiple injuries, high-energy mechanisms, and significant soft-tissue trauma. LEVEL OF EVIDENCE: Therapeutic Level IV. See Instructions for Authors for a complete description of levels of evidence.

The influence of biplanar reduction and surgeon experience on proximal humerus fractures treated with ORIF.

BACKGROUND: Treatment for proximal humerus fractures remains controversial. Studies of open reduction and internal fixation (ORIF) rarely account for reduction quality, while surgeon experience and sagittal plane reduction remain unstudied. In a retrospective case series analysis of AO/OTA C-type proximal humerus fractures treated with ORIF using a locking plate, we hypothesized that reduction quality would be associated with outcome, and reductions would improve with experience. METHODS: We retrospectively identified 41 3- and 4-part proximal humerus fractures treated with ORIF by a single orthopaedic traumatologist. Two blinded traumatologists assessed injury and post-operative radiographs for medial calcar disruption and five measures of deformity. Major complications and functional outcome were assessed. RESULTS: Outcome by ASES score was similar to previous reports (mean 73.6, std dev 22.5). Eleven of 35 patients (31.4%) with greater than six months follow-up experienced a complication. Post-reduction sagittal HSa<25° (RR = =9.44, p = =0.024) and medial calcar disruption (RR = =3.82, p = =0.009) were associated with complications. Post-reduction coronal and sagittal HSa improved with experience (p < 0.001 and p = =0.032, respectively) as did the likelihood of overall anatomic reduction (p = =0.006). ROC analysis found a threshold for superior reduction quality after 23 cases (AUC = =0.873, p < 0.001). CONCLUSION: Sagittal reduction quality and medial calcar disruption were associated with complications. Additionally, reduction quality improved with experience. Future studies of proximal humerus ORIF should include multiplanar assessments of reduction while accounting for surgeon experience.

Distal Nail Target and Alignment of Distal Tibia Fractures.

OBJECTIVES: To assess the relationship between the distal nail target and postoperative alignment for distal tibia fractures treated with intramedullary nailing. DESIGN: Retrospective cohort study. SETTING: A single level 1 trauma center. PATIENTS/PARTICIPANTS: One hundred thirty distal tibia fractures treated with intramedullary nailing over a 10-year period. MAIN OUTCOME MEASUREMENTS: Malalignment >5 degrees. RESULTS: Thirty-eight cases (29.2%) of malalignment >5 degrees included valgus (19 cases, 14.6%), procurvatum (13 cases, 10.0%), recurvatum (1 case, 0.8%), and combined valgus with procurvatum (5 cases, 3.8%). Medially directed nails demonstrated relative valgus (mean lateral distal tibia angle 86.4 vs. 89.4 degrees, P < 0.01) and more frequent coronal malalignment (24 of 78, 30.8% vs. 0 of 52, 0%, P < 0.01). Anteriorly directed nails demonstrated relative procurvatum (mean anterior distal tibia angle 82.8 vs. 80.9 degrees, P < 0.01) and more frequent sagittal malalignment (15 of 78, 19.2% vs. 3 of 52, 5.8%, P = 0.03). Malalignment was less common for nails targeting the central or slightly posterolateral plafond (0 of 30, 0% vs. 38 of 100, 38%), P < 0.01. Multivariate analysis demonstrated the distal nail target (P = 0.03), fracture within 5 cm of the plafond (P = 0.01), as well as night and weekend surgery (P = 0.03) were all independently associated with malalignment. CONCLUSIONS: Alignment of distal tibia fractures is sensitive to both injury and treatment factors. Nails should be targeted centrally or slightly posterolaterally to minimize malalignment. LEVEL OF EVIDENCE: Therapeutic Level IV. See Instructions for Authors for a complete description of levels of evidence.

Orthopedic Surgeons Have Inadequate Knowledge of the Cost of Trauma-Related Imaging Studies.

Radiographic imaging is integral to the diagnosis and treatment of orthopedic injuries. Previous studies have shown that orthopedists consistently underestimate the price of implants, but their knowledge of imaging charges is unknown. This study evaluated whether orthopedic residents and faculty could accurately estimate charges of imaging modalities at their respective institutions. A survey with 10 common imaging studies was sent to 8 academic level I trauma centers. Participants estimated the total charge of each imaging modality. This was compared with the actual charge at their institution. Seven centers produced 162 responders: 74 faculty and 88 residents. The differences between the estimated cost and the billing charge were calculated and broken down by training level and imaging modality. Overall, imaging charges were underestimated by 31% (P<.001), with 19.4% of estimates being within 20% of actual charges (95% confidence interval, 19.1-19.9). There was no difference between training levels (P=.69). There was greater than 1000% variation in charges between institutions. Orthopedists across training levels underestimate hospital charges associated with common imaging studies, and there is a large variation in charges between centers. Awareness of charges is important because charges affect clinical decision making and are relevant to practicing both cost-conscious and clinically sound medicine. [Orthopedics. 2019; 42(5):e454-e459.].

Surgical Technique: Anterolateral Approach to the Humerus.

INTRODUCTION: Although most humeral shaft fractures can be treated nonoperatively, many patients do benefit significantly from surgical treatment. The anterolateral approach to the humerus provides excellent exposure to the humeral shaft, especially to more proximal aspects. In addition, the approach can be extended both proximally and distally, providing the surgeon a dynamic exposure to the humerus for the treatment of fractures and other pathologies. METHODS: This video highlights a clinical case where a mid-shaft humerus fracture was diagnosed and treated with open reduction internal fixation using an 8-hole 4.5-mm limited contact dynamic compression plate through an anterolateral approach. RESULTS: We present indications, anatomic considerations, and surgical techniques used to surgically treat a transverse, mid-shaft humerus fracture through an anterolateral approach. In addition, we demonstrate the use of a push-pull screw to aid in achieving appropriate compression across a fracture site. Using this technique, an anatomic reduction and satisfactory clinical outcome were achieved. CONCLUSIONS: The anterolateral approach to the humerus offers excellent exposure to some humeral shaft fractures, particularly those that lie more proximally. However, its use must be weighed carefully against several other approach options, and the surgeon must account for the specific fracture pattern, as well as their own comfort and familiarity with the approach.

Surgical Technique: Achieving Anatomic Alignment With Temporizing, Ankle-Spanning External Fixation.

INTRODUCTION: Severe injuries to the ankle frequently result in soft tissue trauma too severe to proceed with immediate definitive fixation. Additionally, patients with multiple or vascular injuries may need a temporizing measure before undergoing definitive treatment. Temporizing, ankle-spanning external fixation offers a management strategy that allows for soft tissue rest and prioritized treatment of patients with polytrauma. METHODS: The video demonstrates 2 clinical cases managed with temporizing, ankle-spanning external fixation: a pilon fracture and a bimalleolar ankle fracture-dislocation. RESULTS: The indications, advantages, and a systematic operative approach to applying ankle-spanning external fixation are presented. Specific attention is paid to restoring an anatomic alignment of the ankle. CONCLUSIONS: Temporizing, ankle-spanning external fixation is an important modality in the management of fractures about the ankle, especially in patients with dislocation and/or severe soft tissue injury. A systematic approach that initially addresses length, followed by sagittal and coronal plane correction, can be used to restore anatomic alignment of the ankle.

Long Bone Union Accurately Predicted by Cortical Bridging within 4 Months.

BACKGROUND: Previous retrospective research found that the presence or absence of bridging callus within 4 months postoperatively discriminated accurately between eventual union and nonunion of fractures of the tibial shaft. However, there remains no consensus regarding early prognostication of long bone nonunion. We prospectively assessed the accuracy and reliability of the presence of any bridging callus within 4 months in a cohort that was expanded to include both tibial and femoral shaft fractures. METHODS: We identified 194 consecutive fractures of the shaft of the tibia (OTA/AO type 42-A, B, or C) and femur (OTA/AO type 32-A, B, or C) that were treated with intramedullary nailing. Exclusions for inadequate follow-up (55), extended delay prior to nailing (10), and skeletal immaturity (3) resulted in a study population of 126 fractures (56 tibiae and 70 femora) in 115 patients. Digital radiographs made between 3 and 4 months postoperatively were independently assessed by 3 orthopaedic traumatologists. The accuracy of assessment of the presence of any bridging callus, bicortical bridging, and tricortical bridging to predict union or nonunion was assessed with chi-square analysis and by interobserver reliability (kappa statistic). RESULTS: The nonunion rate was 4% (5 of 126 fractures). The presence of any bridging callus by 4 months accurately predicted union (121 of 122 fractures) and its absence predicted nonunion (4 of 4 fractures). There was 1 incorrect prediction of union for a fracture that failed to unite (p < 0.001). Bicortical or greater bridging predicted union when present (116 of 116 fractures) and nonunion when absent (5 of 10 fractures), incorrectly predicting that 5 healing fractures would go on to nonunion (p < 0.001). Tricortical or greater bridging predicted union when present (103 of 103 fractures) and nonunion when absent (5 of 23 fractures), incorrectly predicting that 18 healing fractures would go on to nonunion (p < 0.001). Interobserver reliability was calculated for any bridging (kappa value, 0.91), bicortical bridging (kappa value, 0.79), tricortical bridging (kappa value, 0.71), and the exact number of cortices bridged (kappa value, 0.67). CONCLUSIONS: The presence of any bridging callus within 4 months accurately predicts the final healing outcome for tibial and femoral shaft fractures treated with intramedullary nailing. This criterion is simple and reliable, and only standard radiographs are needed to make the determination. Basing the prognosis on the bridging of additional cortices risks overestimation of the nonunion rate and is associated with relatively poor reliability.

Surgical Technique: Achieving Reduction With Temporizing, Knee-Spanning External Fixation.

INTRODUCTION: Peri- and intra-articular fractures about the knee are frequently managed with joint-spanning external fixation before definitive treatment. With a systematic approach, a near-anatomic reduction with respect to length, alignment, and rotation can be obtained. METHODS: This video highlights 2 clinical cases: a bicondylar tibial plateau fracture-dislocation and a distal femur fracture, both of which were treated with temporizing, knee-spanning external fixation. RESULTS: The indications, principles, and biomechanics of knee-spanning external fixation are presented. In addition, we demonstrate a systematic approach to applying knee-spanning external fixation. CONCLUSIONS: Temporizing, joint-spanning external fixation is a critical treatment modality in the orthopaedic armamentarium for managing fractures about the knee. With a systematic approach, it is possible to obtain a near-anatomic reduction with respect to length, alignment, and rotation.

Preventing Wedge Deformities When Treating Intertrochanteric Femur Fractures With Intramedullary Devices: A Technical Tip.

Intertrochanteric femur fractures are common injuries associated with significant patient morbidity and mortality and high societal costs. Although intramedullary devices have shown promises for treating a wide range of intertrochanteric femur fractures, improper technique can lead to malalignment, fracture displacement, and/or iatrogenic fractures. In particular, a "wedge effect" has been described, in which the passage of conical reamers and the intramedullary nail itself results in the distraction of intertrochanteric fragments with lateralization of the shaft from the femoral neck and varus malalignment. Here, we describe the mechanism by which this deformity is generated and describe techniques for preventing it, including the use of a modified starting point and an alternative to the conical opening reamers.

Hypovitaminosis D in Orthopaedic Trauma: Which Guidelines Should Be Followed?

OBJECTIVE: To evaluate the risk factors for hypovitaminosis D and to determine the baseline vitamin D supplementation associated with normal vitamin D levels at presentation. DESIGN: Prospective observational study. SETTING: Level I trauma center. PATIENTS: This study included 259 adult patients undergoing operative treatment for orthopaedic trauma (OTA 11-15, 21-23, 31-34, 41-44, 61-62, 70C, 81-82, 87) between January 1, 2014, and December 31, 2014. INTERVENTION: Prospective, observational study. MAIN OUTCOMES: Association of hypovitaminosis D with patient characteristics, injury factors, and vitamin D supplementation. RESULTS: Univariate predictors of hypovitaminosis D included a lack of preinjury supplementation, non-white race, younger age, female sex, non-Medicare insurance, smoking, obesity, Charlson Comorbidity Index <2, and high-energy mechanism. On multivariate analysis, preinjury supplementation was associated with a lower risk (odds ratio: 0.31, 95% confidence interval: 0.15-0.63, P = 0.001) and non-white race was associated with a higher risk (odds ratio: 3.63, 95% confidence interval: 1.58-8.37, P = 0.001) of hypovitaminosis D. Logistic regression analysis found a dose-dependent relationship between vitamin D supplementation and hypovitaminosis D. Each 100-IU increase in vitamin D supplementation was associated with an 8% decrease in the risk of hypovitaminosis D. CONCLUSIONS: A lack of preinjury supplementation and non-white race were independently associated with hypovitaminosis D. Baseline supplementation consistent with Endocrine Society guidelines (2000 IU daily) was more effective than that consistent with Institute of Medicine guidelines (400 IU daily) in maintaining 25-hydroxyvitamin D above 30 ng/mL in this population. LEVEL OF EVIDENCE: Prognostic Level II. See Instructions for Authors for a complete description of levels of evidence.

Practicality of exchanging transparent 3D CT for radiography for pelvic fractures.

OBJECTIVE: We assess the utility of transparent 3D reconstructed CT images for evaluation of traumatic pelvic bony injuries compared to traditional radiographs. METHODS: Radiographs and 3D reconstructed CT were anonymized and randomized before review by 4 board certified physicians using a standardized questionnaire and compared to a gold-standard axial CT by a fifth board certified physician. RESULTS: 49 patients were included. We found significant agreement (K=[0.5-0.92], p<0.001) and comparable accuracy (K=[0.36-0.38], p<0.02) and ghost images of radiographs and transparent 3D reconstructed CT without a difference in confidence (p=0.38). CONCLUSION: Transparent 3D reconstructed CT images may be sufficient for pelvic trauma injury without the use of radiographs.

Advanced Imaging Lacks Clinical Utility in Treating Geriatric Pelvic Ring Injuries Caused by Low-Energy Trauma.

OBJECTIVES: Is advanced imaging necessary in the evaluation of pelvic fractures caused by low-energy trauma in elderly patients? DESIGN: Retrospective review. SETTING: Single institution, Level 1 Trauma Center. PATIENTS: Age ≥60 years old treated for low-energy traumatic pelvic ring injuries. INTERVENTION: None. MAIN OUTCOMES: Posterior pelvic ring injuries diagnosed on advanced imaging, radiographic displacement, admission status, hospital length of stay, change in weight-bearing status recommendations, and whether operative treatment was pursued. RESULTS: Eighty-seven patients met the inclusion criteria, of which 42 had advanced imaging to evaluate the posterior pelvic ring (10 magnetic resonance imaging, 32 computed tomography). More posterior pelvic ring injuries were identified with advanced imaging compared with radiographs alone (P < 0.001). There was no statistically significant difference in rate of admission (P = 0.5) or hospital length of stay (P = 0.31) between patients with radiographs alone compared with patients evaluated with radiographs plus advanced imaging. The rate of displacement >1 cm at presentation and 6-week follow-up was unaffected by the presence of a posterior injury diagnosed on advanced imaging. Treatment for all 87 patients remained weight-bearing as tolerated with assist device irrespective of advanced imaging findings, and no patient underwent surgical intervention by 12-week follow-up. CONCLUSIONS: Despite frequent identification of posterior pelvic ring injuries in patients evaluated with advanced imaging, admission status, length of hospital stay, radiographic displacement, and treatment recommendations were unaffected by these findings. The use of advanced imaging in elderly patients with low-energy traumatic pelvic ring fractures may not be necessary. LEVEL OF EVIDENCE: Diagnostic Level IV. See Instructions for Authors for a complete description of levels of evidence.