Posterior Angulation Research Articles

Double lumen endobronchial tube intubation: lessons learned from anatomy

BackgroundDouble lumen endobronchial tubes (DLTs) are frequently used to employ single lung ventilation strategies during thoracic surgical procedures. Placement of these tubes can be challenging even for experienced clinicians. We hypothesized that airway anatomy, particularly of the glottis and proximal trachea, significantly impacts the ease or difficulty in placement of these tubes.MethodsImages from 24 randomly selected Positron Emission Tomography – Computed Tomography (PET-CT) scans were evaluated for several anatomic aspects of the upper airway, including size and angulation of the glottis and proximal tracheal using calibrated CT measurements and an online digital protractor. The anatomic issues identified were confirmed in cadaveric anatomic models.ResultsProximal tracheal diameter measurements in PET-CT scans demonstrated a mean ± standard deviation of 20.4 ± 2.5 mm in 12 males and 15.5 ± 0.98 mm in 12 females (p < 0.001), and both were large enough to accommodate 39 French and 37 French DLTs in males and females, respectively. Subsequent measurements of the posterior angulation of the proximal trachea revealed a mean angle of 40.8 ± 5.7 degrees with no sex differences. By combining the 24 individual posterior tracheal angles with the 16 angled distal tip measurements DLTs (mean angle 24.9 ± 2.1 degrees), we created a series of 384 patient intubation angle scenarios. This data clearly showed that DLT rotation to a full 180 degrees decreased the mean intubation angle between the DLT and the proximal trachea from a mean of 66.6 ± 5.9 to only 15.8 ± 5.9 degrees.ConclusionsRotation of DLTs a full 180 instead of the recommended 90 degrees facilitates DLT intubations.

Sagittal Angulation and the Treatment of Geriatric Femoral Neck Fractures: Time to Update our Classification Systems.

Inconsistent outcomes have been reported for percutaneous fixation of Garden I/II femoral neck fractures in geriatric patients. It was hypothesized that accounting for variable follow-up would better estimate the failure rate of percutaneous fixation with and without significant sagittal angulation. Retrospective. Single academic healthcare system. Patients ≥50 years of age treated with percutaneous screw fixation of Garden I/II (OTA/AO B1.1/B1.2) femoral neck fractures from 2010 to 2020 were identified. Pathologic fractures and open approaches were excluded. Sagittal angulation was measured using a previously described method. 11 Treatment failure was defined as early fixation failure (within 6 weeks), nonunion, and/or avascular necrosis. Potential associations between treatment failure and patient, injury, and treatment variables were assessed. Cox proportional hazard analysis accounted for variable follow-up when assessing for event-free survival. Of the 240 fractures that met inclusion criteria, there were 20 treatment failures (8%) and 33 fractures with sagittal angulation ≥20 degrees on lateral radiographs (14%). Failure-free survival at 2 years was 91% for patients with <20 degrees of posterior angulation and 52% for patients with ≥20 degrees of posterior angulation ( P < 0.0001). The hazard ratio, which incorporates variable follow-up, for failure with ≥20 degrees of posterior angulation was 6.36 ( P < 0.0001). No other factors were associated with treatment failure. Significant posterior angulation (≥20 degrees) of Garden I/II femoral neck fractures is associated with a high failure rate after screw fixation. The authors suggest characterizing fractures with ≥20 degrees of sagittal angulation as Garden III fractures to better support surgical decision making. Prognostic Level III. See Instructions for Authors for a complete description of levels of evidence.

Effect of geometric heterogeneity using an auxiliary device on the accuracy of complete arch implant scanning: An in vitro study of different clinical simulations.

Intraoral scanning of implants supporting complete arch prostheses is limited because of the lack of geometric heterogeneity and unique reference points, creating inherent errors in the image stitching process by the scanner software program. The purpose of this in vitro study was to evaluate the significance of geometric heterogeneity on complete arch implant scanning by using a novel auxiliary geometric device. Three different clinical simulations were tested to assess its significance. The study also assessed whether scans produced using the auxiliary device would meet a clinically acceptable threshold. A total of 60 scans (n=20) were performed using an intraoral scanner in 3 different clinical simulations: 2 parallel implants, 4 parallel implants, and 4 implants with a 30-degree posterior angulation of the distal implants. Scanning alternated between using the auxiliary geometric scanning device (test groups; 4IP+, 4IA+, 2IP+) and not using the device (control groups; 4IP-, 4IA-, 2IP-). A reference scan for each model was prepared from a high precision laboratory scanner. The scans were analyzed for accuracy in 3-dimensional deviation, interimplant distance deviation, and angular deviation by using an inspection software program. The effect of the auxiliary device was statistically analyzed by comparing scans of the same group using the paired t test for normally distributed data and the Wilcoxon Signed Rank test when data were not normally distributed (α=.05). Significant effects of the auxiliary geometric device were found in 3-dimensional, distance and angular deviations (P<.05). Scans performed using the device were significantly more accurate in most implant positions (P<.05). Linear and angular deviations were clinically acceptable for all test groups. However, the deviations were above the clinically acceptable threshold for the control groups. Using an auxiliary geometric device significantly improved scanning accuracy and produced scans with clinically acceptable deviations, while standard digital scans exceeded the accepted clinical threshold.

Distal Tibia Apex Posterior Angulation: A Normal Anatomic Variant Related to Hindfoot Alignment With Side-to-Side Symmetry.

The sagittal plane of the distal tibia has not been well-described. This study sought to characterize sagittal plane morphology, determine symmetry from side to side, and identify differences based on hindfoot alignment. One hundred twelve bilateral lateral weight-bearing ankle radiographs were retrospectively evaluated (224 ankles). Hindfoot alignment was classified as neutral, planus, or cavus using the Meary angle. The angle between the diaphyseal and distal tibia axes was measured, and the apex location relative to the plafond was recorded. A mean distal tibia apex posterior angulation (DTAPA) of 2.0° (range -2° to 7°, SD = 2.06°) was located 8.0 cm proximal to the plafond. No difference was observed from side to side in DTAPA magnitude (P = 0.36) or location (P = 0.90). Planus alignment was associated with a significantly greater DTAPA (3.05°) as compared with neutral (1.89°) (P = 0.002) and cavus (1.25°) (P < 0.001) alignment. The distal tibia has an apex posterior angulation, suggesting that the true anatomic axis of the tibia terminates just posterior to the plafond center. Hindfoot alignment is related to distal tibia morphology. DTAPA symmetry indicates that contralateral imaging can be used to guide reconstruction of patient-specific anatomy and alignment. Knowledge of the DTAPA may help mitigate sagittal malalignment during distal tibia fracture surgery.

Comparative study of the reliability and accuracy of posterior tooth root angulation measurements in lateral skull teleradiography and CBCT in a group of students of the Faculty of Dentistry of the University of Cuenca

The aim of this article is to analyze the reliability and accuracy of root angulation measurements of posterior teeth in lateral cephalic radiographs and cone beam tomography (CBCT) of a group of students of the Faculty of Dentistry of the University of Cuenca, by means of Nemocast. A total of 40 individuals were examined, of which, according to the inclusion and exclusion criteria, 12 ondividuals were excluded, having as a final sample 28 individuals, of which 28 cone-beam tomographies and 28 lateral cephalic radiographs were examined, the analysis of the inclination of 336 posterior pieces. The occlusal plane of each patient was identified, determined from the upper incisal edge of the central incisor to the mesiobuccal cusp of the maxillary first molar. Subsequently, lines were drawn at the level of the longitudinal axis of the maxillary and mandibular teeth to determine their inclination in the Nemocast program. Techniques such as observational and statistical were used where data was collected in Microsoft Excel 2010 tables. Regarding the results, it was determined that the CBCT has greater precision and reliability compared to the lateral teleradiography of the skull, where the average angulation of the posterior teeth is 90.26°. The upper right first premolars presented greater angulation (94.11°). The lower left first molars presented the lowest mesiodistal angulation of 87.83°. On the other hand, in lateral head radiographs the average angulation is 96.2°. The upper right first premolars presented the greatest angulation (105°) and the lower right second premolars presented the lowest angulation of 91.3°.

Comparison of the posterior teeth angulations in orthodontic patients with different facial growth patterns.

Dental relationships can be affected according to the pattern of facial growth. Thus, the aim of this study was to compare the angulations of posterior teeth in patients with different patterns of facial growth. A total of 412 lateral head radiographs were included. The facial skeletal growth pattern was evaluated with the Björk-Jarabak analysis. For the angular measurements of the posterior teeth, the apex-cusp inclination of the premolars and the long axes of the molars were considered, with respect to the occlusal, palatal and mandibular plane. The intraclass correlation coefficient (ICC) was used to evaluate the intra-examiner concordance. One way ANOVA was used to compare the values between the patterns of facial growth. A significance level was set at 0.05. A high intra-examiner correlation was observed (0.75). Subjects with horizontal and normal growth presented significantly different angulations for the first and second premolars in relation to the palatal plane than the vertical growth (p<0.05). Subjects with horizontal growth pattern showed greater angulation of the teeth with respect to the occlusal plane than the other groups (p<0.05). The angulations of all mandibular teeth related to the mandibular plane were significantly higher for the group with horizontal growth (p<0.05). The first and second premolars presented greater angulations in subjects with horizontal and normal growth than in those with vertical growth. The angulations of all mandibular teeth were significantly higher in the horizontal growth according to the mandibular plane. Key words:Facial growth pattern, posterior tooth, occlusal plane, palatal plane, mandibular plane.

To evaluate the outcome of posterolateral plate in distal humerus fracture

Abstract Background: Extra-articular distal humerus fracture accounts for approximately 16% of humerus fractures and 3% of all fractures in adults. There is good evidence that the overall incidence of distal humerus fractures is increasing worldwide. There is a bimodal distribution concerning age and gender, with peaks of incidence in males aged 12–30 years and females aged 60 years and over. Fractures of the distal third of the humerus are challenging injuries due to their peri-articular location, the small size of the distal bone fragments, and the osteopenic quality of the bone in older adults. In this era of modern orthopedics, despite various advances, distal humeral fractures remain one of the most challenging injuries to treat. Extraarticular fractures of the distal humerus occur at an anatomical watershed between the humerus shaft and the intercondylar region. These injuries are often displaced and have complex fracture patterns with associated comminution. The aim of our study is to evaluate the outcome of the posterolateral plate in distal humerus fracture. Materials and Methods: This prospective study will be hospital based, and will be conducted at our center from September 2021 to May 2023. Patients will be selected from the emergency and outpatient departments of our college. Assessment of functional status will be done using Mayo Elbow Performance Score at 6 months postoperatively. Assessment and analysis of any complications were done in terms of loss of reduction, problems of union, and implant failure. Results: Out of 35 operated patients only 30 qualified to be included in this study. Patient demographics, mode of injury, side involved, soft tissue status, pre-operative radial nerve status, AO type of the fracture, associated injuries, and the time interval between injury and surgical intervention were recorded. During follow-up, the course of fracture healing will be documented radiologically (with a minimum of 6 weeks between successive radiographs). Evaluation of any possible loss of reduction that might occur, compared with the immediate post of radiographs. Assessment of functional status will be done using Mayo Elbow Performance Score at 6 months postoperatively. Radiological misalignment, especially varus deformities followed by apex posterior angulations was the most common deformity, though not clinically evident. Surgical fixation carries the advantage of restoration and maintenance of alignment of the fracture fragments and quick return of function. However, surgical fixation is plagued with complications like non-union, radial nerve palsy, infection, and hardware symptoms. Conclusion: In summary, treating extraarticular distal humeral fractures with plate osteosynthesis is often challenging because of the risk of centrally located posterior plates impinging on the olecranon fossa limiting distal inadequate fixation and leading to loss of fixation many times. The use of these posterolateral locking compression plate obviates this problem. The distal aspect of the plate contour around the lateral column allows for the insertion of up to five locking screws into the distal fragment. Out of 35 patients, 30 patients had complete follow-up, and only two patients needed revision of plating and bone grafting.

Comparison of Cephalomedullary Nails with Sliding Hip Screws in Surgical Treatment of Intertrochanteric Fractures: A Cumulative Meta-Analysis of Randomized Controlled Trials.

The primary objective of the present study was to compare surgical failures of intertrochanteric fractures of the femur through a meta-analysis of randomized controlled trials and to assess the change in surgical outcomes over time in a cumulative meta-analysis. To identify studies evaluating the surgical outcomes of internal fixation using sliding hip screws (SHS) or cephalomedullary (CM) nails for the treatment of intertrochanteric fractures of the femur, all records until August 2021 in the PubMed, Embase, and Cochrane Library databases were searched. Studies with the following characteristics were considered eligible: patients who had an intertrochanteric fracture of the femur (population); patients who received surgical treatment using a CM nail (intervention); patients who received surgical treatment using SHS (comparator); surgical failures that required reoperation, including cut-out or cut-through of lag screws, varus collapse or posterior angulation of proximal fragments, loosening of lag screws or helical blades, and fracture nonunion (outcomes); and two reviewers independently reviewed the titles and abstracts of the randomized controlled trials and selected relevant studies for a full-text review (study design). Twenty-one studies were included in the final analysis consisting of 1,777 cases in the SHS group and 1,804 cases in the CM nail group. The cumulative standard mean difference was 0.87, indicating that CM nails had no significant effect in improving the surgical outcomes. There was no significant difference in surgical failure between SHS and CM nails for all intertrochanteric fractures (odds ratio [OR], 1.07; 95% confidence interval [CI], 0.76-1.49). Pooled data showed no significant difference between the two groups in terms of surgical failure in unstable intertrochanteric fractures (OR, 0.80; 95% CI, 0.42-1.54). Although the use of CM nails has become a current trend in the treatment of intertrochanteric fractures, there is no literature supporting their clinical superiority when compared with SHS.

AO distractor and manual traction reduction techniques repair in distal tibial fractures: a comparative study

BackgroundMinimally invasive plate osteosynthesis (MIPO) via percutaneous plate placement on the distal medial tibia can be performed with minimizes soft tissue injury and produces good clinical results. However, the difficulty with MIPO lies in how to achieve satisfactory fracture reduction and maintain that reduction via indirect reduction techniques to facilitate internal fixation. The purpose of this study was to compare the effects of AO distractor and manual traction reduction techniques combined with MIPO in the treatment of distal tibia fractures.MethodsBetween January 2013 and December 2019, 58 patients with a distal tibia fracture were treated using MIPO. Patients were divided into two groups according to the indirect reduction method that was used: 26 patients were reduced with manual traction(group M), and 32 were reduced with an AO distractor (group A).Time until union and clinical outcomes including AOFAS ankle-rating score and ankle range of ankle motion at final follow-up were compared. Mean operative time, incision length, blood loss and postoperative complications were recorded via chart review. Radiographic results at final follow-up were assessed for tibial angulation and shortening by a blinded reader.ResultsMean operative time, incision length, and blood loss in group A were significantly lower than in group M(p = 0.019, 0.018 and 0.016, respectively).Radiographic evidence of bony union was seen in all cases, and mean time until union was equivalent between the two groups (p = 0.384).Skin irritation was noted in one case(3.1%) in group A and three cases(11.5%)in group M, but the symptoms were not severe and the plate was removed after bony union. There was no statistically significant difference in postoperative complications between the two groups(p = 0.461). Mean AOFAS score and range of ankle motion were equivalent between the two groups, as were varus deformity, valgus deformity, anterior angulation and posterior angulation. No patients had gross angular deformity. Mean tibial shortening was not significantly different between the two groups, and no patients had tibial shortening > 10 mm.ConclusionBoth an AO distractor and manual traction reduction techniques prior to MIPO in the treatment of distal tibial fractures permit a high fracture healing rate and satisfying functional outcomes with few wound healing complications. An AO distractor is an excellent indirect reduction method that may improve operative efficiency and reduce the risk of soft tissue injury.

Apex posterior angulation of the humerus: A characterization of normal sagittal plane anatomy with implications for surgical fixation

IntroductionAn understanding of the sagittal plane morphology of the humerus is relevant during surgical fixation of humeral fractures but is not well described in the literature. The purpose of this study was to better characterize the native sagittal plane morphology of the humerus. Materials and methods170 patients with uninjured full length lateral humerus radiographs were retrospectively evaluated. The angle between the proximal humeral diaphyseal axis and the distal humeral diaphyseal axis was identified and measured. The proximal axis was defined by two points equidistant from the anterior and posterior cortex 10 mm and 100 mm distal to the metaphyseal flare, and the distal axis by two points at 10 mm and 50 mm proximal to the capitellum/trochlea. The relative location of the center of rotation of angulation (CORA) was calculated as a percentage of humeral length. Results114 radiographs were included in the analysis (66 right humeri, 48 left humeri). The average apex posterior angulation was 6.5 +/- 2.9°. The CORA occurred at an average of 80% (SD+/-13%) of the length of the humerus (proximal to distal). Total humeral length and absolute distance to CORA were greater in males compared to females (364 ± 50 mm versus 326 ± 30 mm; p<0.001; 290 ± 68 mm versus 260 ± 48 mm; p=0.003), but there were no significant sex differences with respect to magnitude of the apex posterior angulation (p=0.077) or location of CORA as a percentage of total humeral length (p=0.916). There were no statistically significant associations between age and total humeral length (p=0.056), distance to CORA (p=0.130), location of CORA as percentage of total humeral length (p=0.753), or magnitude of angulation (p=0.075). ConclusionAn apex posterior bow consistently exists in the distal one-quarter of the humerus that is consistent across ages and between sexes. This normal anatomic bow is important to recognize to avoid an extension malreduction and has implications for implant fit and contouring.

Nonoperative Versus Operative Treatment of Type IIA Supracondylar Humerus Fractures: A Prospective Evaluation of 99 Patients.

Although current clinical practice guidelines from the American Academy of Orthopaedic Surgeons suggest that Type II and III supracondylar humerus (SCH) fractures be treated by closed reduction and pin fixation, controversy remains as to whether type IIa fractures with no rotation or angular deformity require surgery. The purpose of our study was to prospectively compare radiographic and functional outcomes of type IIa SCH fractures treated with or without surgery. Between 2017 and 2019, 105 patients between 2 and 12 years of age presenting with type IIa SCH fractures and without prior elbow trauma, neuromuscular or metabolic conditions, were prospectively enrolled. Ten orthopaedic surgeons managed the patients with 5 preferring surgical treatment and 5 preferring an initial attempt at nonoperative treatment. Patients in the nonoperative cohort were managed with a long-arm cast and close radiographic follow-up. Patients underwent a standardized protocol, including 3 to 4 weeks of casting, bilateral radiographic follow-up 6 months postinjury, and telephone follow-up at 6, 12, and 24 months. Ninety-nine patients met the inclusion criteria (45 nonoperative and 54 operatives). Of the nonoperative patients, 4 (9%) were converted to surgery up to their first clinical follow-up. No differences were identified between the cohorts with respect to demographic data, but patients undergoing surgery had on average 6 degrees more posterior angulation at the fracture site preoperatively (P<0.05). At the final clinical follow-up (mean=6mo), the nonoperative group had more radiographic extension (176.9 vs 174.4 degrees, P=0.04) as measured by the hourglass angle, but no other clinical or radiographic differences were appreciated. Complications were similar between the nonoperative and operative groups: refracture (4.4 vs 5.6%), avascular necrosis (2.2 vs 1.9%) and infection (0 vs 1.9%) (P>0.05). Patient-reported outcomes at a mean of 24 months showed no differences between groups. Contrary to American Academy of Orthopaedic Surgeons guidelines, about 90% of patients with type IIa supracondylar fractures can be treated nonoperatively and will achieve good radiographic and functional outcomes with mild residual deformity improving over time. Patients treated nonoperatively must be monitored closely to assess for early loss of reduction and the need for surgical intervention.

Distal Tibia Apex Posterior Angulation: A Normal Anatomic Variant with Side-To-Side Symmetry

Category: Trauma; Ankle Introduction/Purpose: The native sagittal plane alignment of the distal tibia has not been well-described and has implications during the fixation of tibia fractures. Cavovarus foot alignment has been previously thought to influence gastrocsoleus tightness and the potential for anterior talar escape in the setting of an osseous injury in this region. However, the relationship between midfoot alignment and sagittal distal tibia morphology is undescribed. Characterization of this osseous anatomy may be helpful to achieve adequate sagittal alignment during the reduction of distal tibia fractures. The purpose of this study was primarily to characterize distal tibia sagittal morphology and ankle radiographic parameters, determine whether symmetry exists from side-to- side, and secondarily to identify any differences based on midfoot alignment. Methods: 112 patients (60 females, mean age 45.8 years) with bilateral lateral weight-bearing ankle radiographs were retrospectively evaluated (224 ankles). Midfoot morphology was classified as normal, planus, or cavus using Meary's angle (MA) (Planus: MA &lt;-4°, Normal: MA -4°≤x≤4°, Cavus: MA&gt;4°). The angle between the proximal diaphyseal (Line 1) and distal tibia (Line 2) axes was measured, and the location of the center of rotation of angulation (CORA) relative to the plafond was recorded (Figure 1). The horizontal distance (via a line parallel to the floor) from the distal tibia axis (Line 2) to the lateral talar process was measured, as well as the anterior distal tibial angle, and the plafond radius of curvature (ROC). Bilateral ankles and midfoot morphologies were compared using a Mann-Whitney U test and ANOVA, respectively. Correlation was assessed using linear regression. Results: The average distal tibia had 2° of apex posterior angulation with the CORA located 8.0 cm proximal to the plafond. There was no difference by laterality in magnitude of the angulation (p=.358) or distance from the plafond to the CORA (p=.901). The angulation increased as foot alignment transitioned from cavus (1.25°), to normal (1.89°), to planus (3.05°) alignment (r=.32; R2=.102; p&lt;.001). The angulation was larger in men (2.8°) than in women (1.4°) (p&lt;.001) and decreased with increasing patient age (r=.279, R2=.078, p&lt;.001). The lateral talar process was on average 5.9 mm anterior to the distal tibia axis (Line 2), more anterior with cavus versus planus alignment (6.7mm vs. 4.8mm) (p&lt;.001). The average anterior distal tibial angle and plafond ROC were 83.6° and 22.9 mm, respectively, with no significant differences by laterality or midfoot morphology (p&gt;.05 for both). Conclusion: The distal tibia has a consistent apex posterior bow that is symmetric from side-to-side, but variable from patient- to-patient. Distal tibia osseous morphology is related to midfoot alignment, sex, and age. Cavus alignment is additionally correlated with anterior translation of the lateral talar process relative to the distal tibia axis. Surgeons treating distal tibia fractures may consider the use of contralateral imaging as a reduction template to help restore patient-specific sagittal alignment. A tibial nail that ends anterior in the distal segment of a distal tibia fracture should prompt the surgeon to carefully evaluate whether sagittal alignment has been restored.

Hunchback with “S” Shape Spine: Cadaveric Case series

Introduction: Kyphosis is a sharp posterior angulation due to localized collapse or wedging of one or more vertebrae and scoliosis is the lateral curvature of the spine. These may occur due to a congenital defect, fracture, and sometimes pathological or spinal tuberculosis. Materials and Methods: During routine cadaver dissection, four cases of kyphoscoliosis were identified. In the first case, a protrusion on the posterior surface of the trunk of the cadaver at L1 level was observed in a 60-year-old male. The lungs were collapsed and adherent with the pleura and thoracic wall. The posterior wall of the stomach was adherent to the pancreas and a depression was noted on the anterior surface of abdominal aorta. The T12 and L1 vertebrae were fused, and the spine was deviated to the left side. The anterior aspect of the body of L1 vertebrae was marginally eroded. The second case of kyphoscoliosis was from 80-year-old female cadaver. The descending and abdominal aorta had an abnormal course along the vertebral column, third and fourth cases were observed with slight protrusion and scoliosis but not much changes in the vertebral column. Results: The cause of the deformity was confirmed by pathological examination of the tissues showed inter vertebral disc degeneration with calcification and ossification and osteopenia. The underlying etiology can be tuberculosis, injuries, or infections. Conclusion: Severe kyphoscoliosis can affect wide range of systems in the body. It will affect not only the respiratory system also pressure on great vessels as a consequence of bony deformity. KEY WORDS: Kyphosis, Cadaver Dissection, Kyphoscoliosis, Deformity, Calcification, Ossification.

Relapsing low-flow alarms due to suboptimal alignment of the left ventricular assist device inflow cannula.

This retrospective study investigated the correlation between the angular position of the left ventricular assist device (LVAD) inflow cannula and relapsing low-flow alarms. Medical charts were reviewed of all patients with HeartMate 3 LVAD support for relapsing low-flow alarms. A standardized protocol was created to measure the angular position with a contrast-enhanced computed tomography scan. Statistics were done using a gamma frailty model with a constant rate function. For this analysis, 48 LVAD-supported patients were included. The majority of the patients were male (79%) with a median age of 57 years and a median follow-up of 30 months (interquartile range: 19-41). Low-flow alarm(s) were experienced in 30 (63%) patients. Angulation towards the septal-lateral plane showed a significant increase in low-flow alarms over time with a constant rate function of 0.031 increase in low-flow alarms per month of follow-up per increasing degree of angulation (P = 0.048). When dividing this group using an optimal cut-off point, a significant increase in low-flow alarms was observed when the septal-lateral angulation was 28° or more (P = 0.001). Anterior-posterior and maximal inflow cannula angulation did not show a significant difference. This study showed an increasing number of low-flow alarms when the degrees of LVAD inflow cannula expand towards the septal-lateral plane. This emphasizes the importance of the LVAD inflow cannula angular position to prevent relapsing low-flow alarms with the risk of diminished quality of life and morbidity.

RADIOGRAPHIC EVALUATION OF CRESTAL BONE LOSS FOR BAR RETAINEDIMPLANT OVERDENTURE SUPPORTED BY FOUR IMPLANTS VERSUS ALL ON 4 SCREW RETAINED PROSTHESIS

To compare in-vivo conventional 4 parallelimplant placement and bar attachment with cantilever supporting complete overdenture with All-on four configuration supporting fixed screw-retained denture in the term of crestal bone loss around implants Materials and methods:Twelve male patients with good health and firm mucosa were selected to participate in this study. Each patient received four implants in the canine and second premolar areas of the mandible. The patients were randomly classified according to posterior implants angulation into two equal groups,Group(A) received four parallel implants in the canine and second premolar areas, bar-clip attachment with cantilever retaining complete overdenture while Group(B) recievedTwo anterior parallel implants in the canine region and two posteriorly 30° tilted implants in the second premolar area supporting fixed screw retained prosthesis. Crestal bone loss around implants was measured for each patient by using cone beam computed tomography (CBCT) and evaluation made at T6 and T12 Results:Therewassignificantdifference during comparing Marginal bone loss at 6 months with that of 12 months at mesial, distal, buccal and palatal bone for Group (A)(P=0.01, 0.025, 0.0001 and 0.007 respectively) and Group (B) (P=0.03, 0.028, 0.007 and 0.001 respectively). Comparing the two groups, there was no statistical difference at 6 months or 12 months. Conclusion: Despite the limitations in this study, it can be denoted than both treatment options provide the same values of marginal bone loss Only the patient desire is still the contributing factor for choosing the type of restoration, if the patient desire fixed prosthesis with reduced extensions then treatment option used for group(B) (fixed detachable prosthesis screwed to four implants with the posterior implants tilted 30° posteriorly) however when access for oral hygiene measures is more important with patients that cant maintain hygiene with fixed prosthesis, then the selection of group (A) will be more appropriate.

Double Plating in Type C Distal Humerus Fractures: Current Treatment Options and Factors that Affect the Outcome.

PurposeThis is a retrospective cohort study of type C distal humeral fractures (AO classification system) aimed at evaluating the effectiveness of current operative treatment options.Materials and methodsThirty-seven patients with type C distal humeral fractures, treated operatively from January 2002 to September 2016, were retrospectively studied. Thirty-two were eligible for inclusion. Patients were treated by open reduction using the posterior approach, olecranon osteotomy and parallel-plate two-column internal fixation. Patients were evaluated for fracture healing, functional outcomes and complications (infection, ulnar neuropathy, heterotopic ossification and need for implant removal). Restoration of the normal anatomy was defined by measuring carrying angle, posterior angulation and intercondylar distance of distal humerus.ResultsThe mean follow-up time was 8.7 years [range 2–15.5 years, standard deviation (SD) = 3.96]. Mean time to fracture union was 8 weeks for 29 patients (90.6%) (range, 6–10 weeks). In nine cases, there was malunion of varied importance (28.1%). There was one case with postoperative ulnar neuropathy and one case with deep infection. The mean Disabilities of the Arm, Shoulder and Hand (DASH) score and mean Mayo Elbow Performance Score (MEPS) were 20 (range 0–49) and 83.3 (range 25–100), respectively.ConclusionIn complex distal humerus fractures, the posterior approach with olecranon osteotomy and parallel plating of two columns, after anatomic reconstruction of the articular segment, is a prerequisite for successful elbow function.How to cite this articleAthanaselis ED, Komnos G, Deligeorgis D, et al. Double Plating in Type C Distal Humerus Fractures: Current Treatment Options and Factors that Affect the Outcome. Strategies Trauma Limb Reconstr 2022;17(1):7–13.

Posterior Displacement and Angulation of Displaced Lateral Clavicle Fractures: Letter to the Editor.

Posterior Displacement and Angulation of Displaced Lateral Clavicle Fractures: Letter to the Editor.

Risk factors for early-onset radiographical adjacent segment disease in patients with spondylolytic spondylolisthesis after single-level posterior lumbar interbody fusion

BACKGROUND CONTEXTThe risk factors for radiographical adjacent segment disease (ASD) in patients with degenerative spondylolisthesis have been previously reported. However, there are only few reports on patients with spondylolytic spondylolisthesis who underwent single-level posterior lumbar interbody fusion (PLIF). PURPOSEThe study aimed to investigate the risk factors for radiographical ASD in patients with L5–S1 spondylolytic spondylolisthesis who underwent single-level PLIF. STUDY DESIGN/SETTINGA retrospective study PATIENT SAMPLEThis study retrospectively reviewed 135 consecutive patients (91 men and 44 women) with symptomatic L5–S1 spondylolytic spondylolisthesis who underwent single-level PLIF. OUTCOME MEASURESThe pre- and postoperative (at the final follow-up) spinopelvic parameters, % slip, sacral slope, lumbar lordosis (LL), pelvic tilt, pelvic incidence (PI), PI minus LL (PI − LL), lumbosacral angle, C7 sagittal vertical axis, and thoracic kyphosis were measured using standing radiographs. METHODSRadiographical ASD was defined as disc height loss (>3 mm), increase of posterior angulation (>5°), or progression of spondylolisthesis (>3 mm) between the pre- and postoperative radiographs. Pfirrmann's classification was used to evaluate disc degeneration. The radiographical parameters and changes between the pre- and postoperative values were evaluated and compared for the non-ASD and ASD groups. Binary logistic regression analysis was performed to evaluate the adjusted associations between each potential explanatory variable and ASD development. RESULTSThe radiographical ASD incidence was 11%. Additionally, 60% of the patients with ASD had radiographical ASD at 1 year and all cases of radiographical ASD in this follow-up period occurred within 3 years after the initial surgery. The mean period of ASD occurrence after initial surgery was 21.7 ± 12.6 months. No patients required reoperation for radiographical ASD. Multivariate analysis revealed that a preoperative (odds ratio [OR], 5.9; 95% confidence interval [CI], 1.2–28.9; p=.03) and a postoperative (OR, 6.5; 95% CI, 1.2–34.5; p=.03) PI − LL of ≥15° were risk factors for radiographical ASD. CONCLUSIONSPre- and postoperative PI − LL value mismatch was identified as significant independent risk factors for radiographical ASD in patients with L5–S1 spondylolytic spondylolisthesis. Obtaining larger lordosis at L5–S1 may be the key to preventing radiographical ASD.

Results of non-surgical treatment of isolated closed tibial shaft fractures

This Research aimed to see how well isolated closed tibial fractures retained their reduction after being immobilized in a cast. Medical data were gathered for all patients of identified solitary closed tibial shaft fractures treated non-surgically. Males were more typically impacted than females among the 32 individuals evaluated. The mean age was 27.68 years old (SD=7.06). Direct trauma with motorcycle was the most prevalent causes of injury. The average follow-up time for each patient was 9.1 months (SD=2.36). According to the AO/OTA classification, 34.4 % of the fractures are A1.1, 28.1% are A2.1, and 37.5 % are A3. The average time for all fractures to heal was 13.7 weeks (SD=3.24). In the 22nd week, there was one occurrence of delayed union. Shortening of bone was less than 1 cm in 93.75 % of patients and more than 1.5 cm in 6.25% of patients. In 2 (6.25%) of the patients, the anterior or posterior angulation was more than 10 degrees. Furthermore, even with uncomplicated tibial fractures, there appears to be a debate about therapy selection when considering long-term physical handicap and a longer follow-up time.

EVALUATION OF RESULTS OF NON OPERATIVE TREATMENT OF FRACTURE SHAFT OF THE HUMERUS WITH A FUNCTIONAL BRACE

Introduction: Fractures of the humeral shaft account for roughly 3% of all fractures due to fall on the outstretched hand, motor vehicle accidents and direct loads to the arm. The brace effectively compresses the bulky biceps and triceps muscle allowing early shoulder, elbow, wrist and hand motion with nonunion and radial nerve palsy in a signicant percentage of humeral shaft fractures. This study intends to assess the results of non-operative treatment of fracture shaft of the humerus with a functional brace. Materials and Methods: Prospective observational study was conducted in NMCTH, Birgunj among 50 patients from 16 years onwards of age who presented with fracture of humerus shaft. The patients with open fracture, oating elbow, bilateral humeral fracture, polytrauma, pathological fracture, additional injury of the extremities and patients with neurologic and psychiatric disorders were excluded from the study. The patients were treated with close reduction and immobilization in functional humeral cast brace and were followed up in outpatient department basis once a week for the rst four weeks and every four weeks subsequently till fracture united. After removal of brace functional evaluation of results of upper limb was done according to Hunter's criteria. RESULTS: Six patients out of 50 lost to follow up and was removed from nal analysis . Out of 44 cases, mean age of patient was 34.77 year. Most of them 28(64%) were male. RTA was most common mode of injury 24(54%). Most of the patient 26(59%) had rd fracture on non dominant side. Majority of the fractures 24(55%) were in the middle 1/3 . Thirty two cases (72%) attended the hospital within 24 hours of injury. Union was achieved in 41(93%) patients within a mean time of 11.48 weeks. One transverse and two comminuted fractures in middle and distal third of diaphysis did not unite and were treated surgically. According to Hunter's criteria of evaluation of results, 31(75.6%) of united fractures had excellent (G5) and 10(24.4%) had good (G4) results. Restriction of few degrees of terminal range of movements of shoulder abduction and external rotation present initially improved subsequently after physiotherapy. Mean varus angulation in 39 patients at the time of removal of brace was 7.05° and mean valgus angulation in four patients was 6.00°. Mean anterior angulation of 6.85° was present in 21 patients and mean posterior angulation of 7.11° was present in 20 patients at the time of removal of brace. Mean shortening of 6.5 mm was present in 36 patients. The various angulation deformities and shortening at the end of union did not cause functional and cosmetic effect. Conclusion: Fracture shaft of humerus treated by close reduction and functional bracing has good functional outcomes.