Evaluation of Radiographic Parameters Following Dorsal Wrist-Spanning Plate Fixation of Distal Radius Fractures to the Second Versus Third Metacarpal.

PURPOSE: Dorsal wrist-spanning plate fixation for comminuted, intra-articular distal radius fractures involves the indirect reduction of intra-articular fractures via ligamentotaxis. The reduction is maintained by application of a bridge plate from the radial diaphysis to either the second or third metacarpal. The objective of this study was to retrospectively compare radiographic outcomes between distal radius fractures managed with bridge plate fixation to the second versus third metacarpal. METHODS: A single-institution retrospective review identified 50 cases of distal radius fractures that underwent dorsal wrist-spanning plate fixation, with 9 and 41 fractures undergoing fixation to the second and third metacarpals, respectively. Radiographic parameters, such as radial height, radial inclination, volar tilt, and ulnar variance, were measured at 3 time points: immediately after surgery, immediately prior to elective plate removal, and at the final follow-up. Radiographic measurements of the 2 cohorts were compared at the 3 time points. RESULTS: Final radiographs showed an average radial height of 8.9 mm versus 9.4 mm for the second versus third metacarpal cohorts, respectively; average radial inclination of 17.4° for both the second and third metacarpal cohorts; average volar tilt of 1.9° versus 1.7° for the second versus third metacarpal cohorts, respectively; and an average ulnar variance of +0.6 mm versus +0.1 mm for the second versus third metacarpal cohorts, respectively. Radiographic parameters of the second and third metacarpal cohorts were similar across all the time points. Additionally, evaluation of the radiographic parameters across the 3 time points (immediately after surgery, immediately prior to elective plate removal, and at the final follow-up) demonstrated little to no loss of radiographic alignment. CONCLUSIONS: Radiographic outcomes for distal radius fractures managed with bridge plate fixation to the second versus third metacarpal appear similar. The distal plate fixation site can likely be determined on the basis of fracture anatomy and patient-specific features. TYPE OF STUDY/LEVEL OF EVIDENCE: Therapeutic IV.

Percutaneous screw fixation of the pubic symphysis versus plate osteosynthesis: a biomechanical study.

Objectives: To compare the stability of screw fixation with that of plate fixation for symphyseal injuries in a vertically unstable pelvic injury (AO/Tile 61-C1) associated with complete disruption of the sacroiliac joint and the pubic symphysis. Methods: Eight fourth-generation composite pelvis models with sacroiliac and pubic symphyseal disruption (Sawbones, Vashon Island, WA) underwent biomechanical testing simulating static single-leg stance. Four were fixed anteriorly with a symphyseal screw, and 4 with a symphyseal plate. All had single transsacral screw fixation posteriorly. Displacement and rotation were monitored at both sacroiliac joint and pubic symphysis. Results: There was no significant difference between the 2 groups for mean maximum force generated. There was no significant difference in net displacement at both sacroiliac joint and pubic symphysis. There was significantly less rotation but more displacement in the screw group in the Z-axis. The screw group showed increased stiffness compared with the plate group. Conclusions: This is the first biomechanical study to compare screw versus plate symphyseal fixation in a Tile C model. Our biomechanical model using anterior and posterior fixation demonstrates that symphyseal screws may be a viable alternative to classically described symphyseal plating.

Biomechanical Comparison of 4 Transsacral Fixation Constructs in a Type 61C, Zone II Pelvic Fracture Model.

OBJECTIVES: OTA/AO 61C pelvic ring injuries are vertically unstable because of complete sacral fractures combined with anterior ring injury. The objective of this study was to compare the biomechanical characteristics of 4 transsacral screw constructs for posterior pelvic ring fixation, including one that uses a novel fixation method with a pair of locked washers with interdigitating cams. METHODS: Type C pelvic ring disruptions were created on 16 synthetic pelvis models. Each pelvis was fixated with an S2 screw in addition to being allocated to 1 of 4 transsacral constructs through S1: (1) 8.0-mm screw, (2) 8.0-mm bolt, (3) 8.0-mm screw locked with a nut, and (4) 8.00-mm screw locked with a nut with the addition of interdigitating washers between the screw head and ilium on the near cortex, and ilium and nut on the far cortex. The anterior ring fractures were not stabilized. Each pelvis underwent 100,000 cycles at 250 N and was then loaded to failure using a unilateral stance testing model. The anterior and posterior osteotomy sites were instrumented with pairs of infrared (IR) light-emitting markers, and the relative displacement of the markers was monitored using a three-dimensional (3D) motion capture system. Displacement measurements at 25,000; 50,000; 75,000; and 100,000 cycles and failure force were recorded for each pelvis. RESULTS: The novel washer design construct performed better than the screw construct with less posterior ring motion at 75,000 ( P = 0.029) and 100,000 cycles ( P = 0.029). CONCLUSIONS: The novel interdigitating washer design may be superior to using a screw construct alone to achieve rigid, locked posterior ring fixation in a synthetic pelvis model with a Type C pelvic ring disruption.

Outcomes and Cost of Reduction of Overriding Pediatric Distal Radius Fractures.

BACKGROUND: This study compared radiographic outcomes of pediatric patients undergoing closed reduction of 100% displaced distal radius fractures to a historical, published cohort treated with casting alone. We also examined the expense associated with sedated reduction. METHODS: Single-center, retrospective cohort study examining radiographic outcomes following reduction of 100% translated distal radius fractures in 50 consecutive pediatric patients. Radiographic outcomes were compared with a historical cohort published by Crawford and colleagues. Charges associated with emergency department (ED) and clinic visits were compared between the reduction cohort and a comparison cohort of 13 patients with fractures not requiring reduction. RESULTS: Forty-nine children (mean age 4.7 y) were included in this study. Duration of casting averaged 51 days and ED visit duration was 6.6±2.5 hours. Mean sagittal and coronal angulation at time of injury were 16.4 and 15.6 degrees, respectively, and were 13.2 and 9.4 degrees at the time of final follow-up. All fractures achieved radiographic union. Eighteen patients underwent a total of 21 unexpected cast changes. No patients required repeat sedation or surgical management.Angulation after casting was significantly better in the reduction cohort compared with the casting-only cohort initially, however, at final follow-up, both coronal and sagittal angulation were significantly worse in the reduction cohort compared with the casting-only cohort (coronal angulation 8.59 vs. 0.75, P<0.0001; sagittal angulation 13.49 vs. 2.2, P<0.0001).Charge analysis compared 46 patients in the reduction cohort to 13 patients with unreduced fractures from the same institution during the same time period. Mean clinic charges were similar ($1957 vs. $2240, P=0.3008). ED charges were higher in the reduction cohort compared with the nonreduction cohort ($7331 vs. $3501, P<0.001), resulting in higher total charges in the reduction cohort ($9245.04 vs. $5740.99, P<0.001). CONCLUSIONS: While closed reduction of 100% translated distal radius fractures in the pediatric population improves angulation initially, casting alone may provide similar or better radiographic outcomes, expedited care, reduced patient exposure to the risks of procedural sedation, and avoidance of ED charges associated with procedural sedation. LEVEL OF EVIDENCE: Level III-therapeutic.

Incidence and predictors of positive intraoperative cultures in primary shoulder arthroplasty following prior ipsilateral shoulder surgery.

BACKGROUND: To our knowledge, the rate of positive intraoperative cultures in patients undergoing primary shoulder arthroplasty with prior ipsilateral nonarthroplasty shoulder surgery is unknown. The aim of this study was to determine the incidence and predictors of positive cultures in these patients. METHODS: We performed a retrospective review of patients with prior ipsilateral shoulder surgery with intraoperative cultures taken at the time of primary shoulder arthroplasty. We evaluated culture results, demographics, and number of prior surgeries. Regression analysis was used to determine patient-related risk factors that predict positive cultures. RESULTS: A total of 682 patients underwent primary shoulder arthroplasty, 83 had at least 1 prior ipsilateral shoulder surgery: 65.1% male, mean age 64.2 ± 10.9 years. For the cohort of 83 patients, an average of 3.2 ± 1.2 tissue samples were obtained for each patient, with a mean of 0.84 ± 1.14 tissue cultures being positive (range 0-5). Thirty-seven of the 83 patients (44.5%) had at least 1 positive culture, with Cutibacterium acnes the most frequent organism (31/37; 83.4%). An average of 1.9 ± 0.96 tissue cultures resulted positive (range 1-5) for the 37 patients who had positive cultures, 40.5% (15/37) had only 1 positive tissue culture (12/15 C acnes, 2/15 Staphylococcus epidermidis, and 1/15 vancomycin-resistant enterococcus). Male sex and history of prior shoulder infection were predictive of culture positivity (odds ratios: 2.5 and 20.9, respectively). Age, race, medical comorbidities, number of prior shoulder surgeries, and time from index shoulder surgery were not predictive of culture positivity. CONCLUSION: About 45% of patients with no clinical signs of infection and a history of prior ipsilateral shoulder surgery undergoing primary shoulder arthroplasty grew positive intraoperative cultures. The significance of these findings remains unclear with regard to risk of periprosthetic infection and how these patients should be managed.

Screening for undiagnosed bleeding disorders in post-tonsillectomy bleed patients: Retrospective review and systematic review of the literature.

OBJECTIVES: There is currently no standard for screening children with post-tonsillectomy bleeds (PTB) for coagulopathy disorders. This study aims to identify children with occult coagulopathy diagnosed at PTB and to identify factors associated with diagnosis. A systematic review of the literature further identified trends in this topic. METHODS: A retrospective chart review of patients returning to the operating room for PTB at a tertiary children's hospital was undertaken from 2012 to 2016. A systematic review using Medline OVID was subsequently performed. RESULTS: Of 12,503 tonsillectomies, 311 children (52% male, mean age 8 years) required surgery for PTB (2.5% rate). Twenty-one patients (7%) had multiple episodes. Only two patients (0.6%) (both with known coagulopathy) underwent pre-tonsillectomy labs and 260 (84%) had labs at PTB. Six patients (2%) were diagnosed with a new coagulopathy, most commonly von Willebrand's Disease (vWD) in five (2%). Three patients (1%) were diagnosed at first PTB and three (1%) at second PTB. Of the three diagnosed at second PTB, two had normal partial thromboplastin time (PTT). In systematic review, 1243 manuscripts were reviewed and 8 papers discussing this topic are presented. CONCLUSION: Occult coagulopathy was rarely diagnosed at PTB, but this may be limited by inconsistent screening. PT and PTT are not sensitive tests for vWD, and normal coagulation labs may lead to delayed diagnosis. The literature reveals occult coagulopathy is rare but often diagnosed after severe or recurrent hemorrhage. In order to provide efficient care and medical management, a standardized algorithm and sensitive labs for screening PTB patients are needed.