AP Length Research Articles

The Relationship Between Craniocervical Morphology and the Presence and Level of Cervical Facet Joint Degeneration.

To investigate the relationship between craniocervical morphology and the presence and level of cervical facet joint degeneration (FJD). A total of 108 consecutive female patients aged 45-55 years who had undergone neck + brain CT angiography were included in this retrospective sectional study. Only patients of a certain age and of the same gender were included in order to eliminate the differences that create a disposition to the development of spinal degeneration. The presence of facet joint (FJ) arthritis (grade ≥2 degeneration in at least one affected facet joint) and the grade of the facet joint degeneration for each patient were recorded. A total of 20 lengths and 3 angles of craniocervical morphology were measured. The differences between the individuals with and without FJ arthritis were investigated with the independent-sample t test, and the relationship between the FJD grade and craniocervical morphology was investigated using the Spearman correlation test. Individuals with FJ arthritis were found to have longer Grabb-Oakes measurement, shorter FM AP length, lower ADI, lower EOP thickness, higher clivus length, higher crista gall-ATS distance, lower CCA angle, lower distance between the C1 vertebra lateral masses, and higher BAI than those without FJ arthritis (P ˂ 0.05). Besides, we found that the FJD grade increased as the Grabb-Oakes measurement increased, ADI distance decreased, FM AP length decreased, EOP thickness decreased, clivus length increased, basal angle increased, distance between the C1 vertebra lateral masses decreased, and BAI increased (P ˂ 0.05). Differences in craniocervical morphology are statistically associated with degenerative processes that result in degenerative changes in the facet joint. Therefore, some morphological changes in craniocervical anatomy cause changes in the momentum and distribution of the load on the facet joints, predisposing the patient to facet arthropathy and osteoarthritis.

Investigation of the anatomic risk factors in acute anterior cruciate ligament ruptures to develop ramp lesions of the medial meniscus by quantitative MRI

ObjectiveTo investigate the anatomic risk factors of knee in patients with acute non-contact anterior cruciate ligament (aACL) ruptures to develop ramp lesions.MethodsA total of 202 subjects were retrospectively divided into three groups: (1) aACL ruptures combined with ramp lesions group (n = 76); (2) isolated ACL ruptures group (n = 56) and (3) normal controls group (n = 70). Quantitative morphological parameters on MRI were measured including: diameter of medial femoral condyle (MFC), anterior-posterior length and depth of medial tibial plateau (MTP AP length and depth), lateral posterior tibial slope (LPTS) and medial posterior tibial slope (MTPS), asymmetry of LPTS and MPTS (LMPTS), lateral meniscal slope (LMS), and medial meniscal slope (MMS).ResultsThe MTP AP length, MTP AP length/MFC diameter ratio, MTP depth, LPTS and the asymmetry of LMPTS showed significant differences among the three groups (p < 0.001). The risk factors associated with the ramp lesions including a longer MTP AP length (OR 1.17, 95% CI 1.00–1.44, p = 0.044), increased MTP depth (OR 1.91, 95% CI 1.22–3.00, p = 0.005) and lager ratio (OR 1.11, 95% CI 1.01–1.22, p = 0.036). The highest AUC was the MTP AP length/MFC diameter ratio (0.74; 95% CI, 0.66–0.82). The combination model increased higher accuracy (0.80; 95% CI, 0.72–0.88).ConclusionSeveral bony anatomic characteristics of the knee, especially the morphology of medial tibia plateau, are additional risk factors for aACL ruptures to develop ramp lesions.Critical relevance statementPredictive anatomic risk factors of the knee for patients with acute non-contact anterior cruciate ligament (aACL) ruptures to develop ramp lesions, especially the morphology of medial tibia plateau, are detectable by MRI.Key PointsRamp lesion development can complicate aACL ruptures and requires specific treatment.Longer AP length and increased MTP depth are risk factors for concurrent ramp lesions.Identification of ramp lesions allows for the most appropriate treatment.Graphical

Are TomoFix Locking Plates Really Anatomical for Indian Population?

The use of a TomoFix plate can be a challenge in Asian population who inherently have smaller tibial bones. This study aims to find out the normal proximal tibial morphometric measurements in Indian population and to compare the Medial Anterior Radius of Curvature (MAROC) of proximal tibia with the Proximal Part Radius of Curvature (PPROC) of the available TomoFix plates, to estimate conformity of the fit between them. Retrospective Computed Tomography (CT) and Magnetic Resonance Imaging (MRI) based proximal tibial measurements were performed on 824 knees, 664 females and 160 males (604 patients). The mean MAROC, mean MAROC in males and mean MAROC in females were compared to the PPROC of TomoFix plates. The radiological measurements revealed a mean AP length of 45.22 ± 3.79mm, mean ML width of 69.04 ± 5.01mm and mean MAROC of 21.88 ± 2.11mm. The mean MAROC in males was 24.07 ± 2.1mm, whereas in females it was 21.35 ± 1.75mm. The mean MAROC, mean MAROC in males and mean MAROC in females when compared to the PPROC of Standard TomoFix plate (38mm), Small TomoFix and Anatomical TomoFix plates (30mm) showed a significant difference (p < 0.01), indicating that the radius of curvature of the plate does not match the radius of curvature of the anteromedial tibial plateau. The TomoFix plates, including Small (Asian Version) and Anatomical plates, are relatively large for the Indian population. Our study may help the implant to designers develop a plate that will better suit the Indian population, improving results and reducing hardware-related complications of MOWHTO.

A novel method to evaluate the transverse pedicle angles of the lower lumbar vertebrae using digital radiography.

To investigate a novel approach for establishing the transverse pedicle angle (TPA) of the lower lumbar spine using preoperative digital radiography (DR). Computed Tomography (CT) datasets of the lower lumbar were reconstructed using MIMICS 17.0 software and then imported into 3-matic software for surgical simulation and anatomical parameter measurement. A mathematical algorithm of TPA based on the Pythagorean theorem was established, and all obtained data were analyzed by SPSS software. The CT dataset from 66 samples was reconstructed as a digital model of the lower lumbar vertebrae (L3-L5), and the AP length/estimated lateral length for L3 between the right and left sides was statistically significant (P = 0.015, P = 0.005). The AP length of the right for L4 was smaller than that of the left after a paired t test was executed (P = 0.006). Both the width of the pedicle and the length of the pedicle (P2C1) were consistent with TPA (L3<L4<L5). There were no significant differences in TAN-TPA and DR-TPA compared with real TPA. The ICCs for the real TPA and DR-TPA within L3 showed good reliability, and the ICCs for the real TPA and DR-TPA within both L4 and L5 showed moderate reliability. Our novel approach can be considered a reliable way to determine the transverse pedicle angle from routine DR, and the width and length of the pedicle within lumbar DR should be considered to determine the length and trajectory of the screw during preoperative planning.

Comparison of different intensive triglyceride-lowering therapies in patients with hyperlipidemic acute pancreatitis

ObjectivesThe goal of this study was to investigate the clinical value of emergent triglyceride (TG)-lowering therapies for hyperlipidemic acute pancreatitis (HLAP). Methods126 HLAP patients were assigned randomly to receive either conventional treatment (CT), normal saline (NS) alone, or continuous veno-venous hemofiltration (CVVH) as an intensive TG-lowering therapy. TG levels, clinical outcomes, and inflammatory biomarkers were compared among the three groups. ResultsBaseline characteristics did not differ significantly among the groups. CVVH removed TG from the plasma and achieved its target TG (<500 mg/dL) in approximately 25 h, compared to 40 h in the NS alone group and no targeted effect within 48 h in the CT group (P < 0.05). Although the majority of clinical outcomes did not differ significantly, an unexpectedly higher incidence of organ failure occurred in the CVVH group compared to the others. Hospital costs, severe AP patients and length of stay were significantly higher in the CVVH group compared to the other groups (P < 0.005). ConclusionsEarly CVVH lowers TG levels more efficiently than NS alone or CT therapy, but is not superior in terms of clinical outcomes and costs. NS also lowers TG levels and is significantly less costly than the other two treatments. Further multicenter studies are needed to determine the feasibility of NS alone treatment for HLAP patients.

Sub-optimal femoral fit in total knee arthroplasty, a systematic review of human femoral data vs off-the-shelf contemporary femoral components

PurposeThe purpose of the current study is to investigate the inadequacy of fit between the human distal femur and the knee implants offerings and describe the available strategies to overcome this issue.MethodsA systematic research of the literature was performed to identify studies reporting morphologic measures of the distal femur. Studies were excluded if they included unhealthy knees or the morphological analysis did not report the two key dimensions to identify the patient’s unique anatomy: AP length and mediolateral (ML) width. Clinically relevant component overhang or underhang was considered when the metal-bone mismatch was > 3 mm as described in the literature.ResultsSix studies with anthropometric analysis of 1395 distal femurs met the inclusion criteria. The analysis revealed that by employing the available sizes of four current “state-of-the-art” primary off-the shelf (OTS) femoral implants up to 13–41% would show underhang and 9–27% overhang clinically relevant and the introduction of narrower sizes did not reduce this percentage of underhang but improved the overhang rate of 10–15%.ConclusionsWhenever an ML/AP mismatch in encountered in the operating room, adaptations are needed, and these bring about deleterious biomechanical and clinical complications. Therefore, this study highlights the need for implants design with multiple ML offerings per AP size, since they provide not only more sizes options but more femoral shapes to match the different ML sizes of the distal femur, compared to designs with single ML offerings for a given femoral AP dimension.

Evaluation of thymic dimensions in patients with multisystem inflammatory syndrome

Multisystem inflammatory syndrome (MIS-C) is the most important complication of COVID-19 in the pediatric population. Unfortunately, this problem is an unpredictable situation in patients with COVID-19. We aimed to evaluate the effects of MIS-C on thymus dimensions in pediatric patients. We retrospectively analyzed the files of 368 pediatric patients aged 2-18 years, who were diagnosed with COVID-19. Computer Tomography (CT) images of 22 patients diagnosed with COVID-19 and 10 patients diagnosed with MIS-C were evaluated in detail by two board-certified radiologists. Eighteen age and sexmatched patients who applied to the emergency department of our hospital for any reason and had a CT scan for any reason were selected as the control group. The data of both groups were statistically compared. Considering the differences between the groups in terms of laboratory data, monocytes, hemoglobin, and platelet were significantly lower in the MIS-C group than the other groups. Procalcitonin, C- reactive protein, neutrophil to lymphocyte ratio (NLR), platelet to lymphocyte ratio (PLR), and proBNP levels were statistically significantly higher in the MIS-C group compared to the other groups Regarding the differences in thymus dimensions, thymus AP diameter, transverse diameter, length, thickness, and volume were significantly higher in the MIS-C group than in the other groups There was a significant positive correlation between the transverse diameter of the thymus and CRP, procalcitonin, pro-brain natriuretic peptide (proBNP), and NLR levels. Our study shows that thymus dimensions and acute phase reactants are higher in pediatric patients in the MIS-C group. Also, thymus transverse diameter, thymus thickness, and PLR values pose a risk for the development of MIS-C. More research is needed on the role of the thymus gland in the pathogenesis and diagnosis of MIS-C.

Comparison of posterior cranial fossa morphometric measurements in Chiari type I patients with and without syrinx cavity on magnetic resonance imaging.

To compare the posterior fossa measurements of Chiari type I malformation (CHM1) patients with and without syrinx and with a control group. The patients with syrinx were divided into 2 groupd according to syrinx width/cord width (S/C) ratios: group 1 - S/C ratio < 50%; group 2 - S/C ratio > 50%. The length of the clivus, the AP length of the foramen magnum, the AP length of the posterior fossa, the perpendicular distance between the McRae line and (a) the splenium of corpus callosum, (b) the pons, and (c) the fastigium of the 160 patients and of the 160 control patients were statistically compared. In addition, the measurements of the patients with and without syrinx, according to the S/C ratio, were statistically compared. Syrinx was present in 59 (36.8 %) of the 160 patients. The S/C ratio was < 50% in 30 (50.9 %) of them, and S/C ratio > 50% in 29 (49.1%) of them. All the measurements in the patient group, except of the AP length of the foramen magnum, were statistically significantly lower than in the control group (p = 0.001). There was no significant difference in the measurements of the patients with syrinx group 1 and the patients without syrinx, but the AP length of posterior fossa was statistically significantly lower in the patients with syrinx group 2 than the patients without syrinx (p = 0.03). The S/C ratio can be a guide to the underlying aetiology.

Short- to Intermediate-Term Radiographic Outcomes Following Cotton Osteotomy

The cotton osteotomy or the medial cuneiform opening wedge osteotomy has been a common adjunct procedure in flatfoot reconstruction to correct for forefoot varus or a dorsiflexed first ray. The main goal of the study is to retrospectively review outcomes specifically in the short-intermediate term for the cotton osteotomy. The medical records of a single foot and ankle surgeon (PRB) were reviewed for patients who met inclusion and exclusion criteria. The study period was from January 2006 to October 2018. The analysis was performed using information obtained from chart-review to examine union and complication rates, as well as changes in the cuneiform articular angle based on graft size and type. A total of 71 feet in 61 patients underwent cotton osteotomies for flatfoot reconstruction. Overall complication rate was 5.6% (4/71) with 2 nonunions (2/47) in those that had radiographic follow-up of greater than 9 months. Change in cuneiform articular angle (CAA) showed 0.91° of correction per 1-millimeter increase in graft wedge size from preoperative to 3 weeks. Change for anterior-posterior medial cuneiform bisection dorsal length (AP length) was 0.70 mm per 1 mm of graft used from preoperative to 3 weeks. 6 weeks to 10 weeks showed statistically significant changes in the CAA (p=.01) and the AP length (p=.002). The cotton osteotomy showed statistically significant radiographic loss of correction between the 6- and 10-week time points when patients were allowed to begin weightbearing. Metal grafts may provide maintenance of correction which warrants future studies on their efficacy.

Morphometric Evaluation of Fourth Ventricle by Using Magnetic Resonance Imaging

Background: The fourth ventricle is one of the components of the ventricular system in the brain, along with the lateral and third ventricles. The ventricular size is considered as a potential indicator in determination of many brain diseases. There are dimensional differences between males and females which appeared larger in males. Aim: The aim of this study was to determine the radiological dimensions of fourth ventricle and to assess their relationship with gender and age. Subjects and methods: Brain Magnetic Resonance Images (MRI) of 100 patients (44 males and 56 females) were examined. The dimensions of the fourth ventricle were estimated. Additionally, the variation with sex and age were also described. After collection and checking of data, Statistical Package for Social Sciences (SPSS) was used for data entry and analysis. Results: The AP length of 4th ventricle of all patients ranged from 6.5-13.9 mm with mean (± SD) 10.67 ± 1.66 mm. In females, it ranged from 6.5-13.9 mm with mean (± SD) 10.48 ± 1.76 mm while in males; it ranged from 7-13.9 mm with mean (± SD) 10.92 ± 1.51 mm. The mean of 4th ventricle AP length of males were comparatively higher than females. Similarly, the 4th ventricle width of all patients ranged from 8.7-16.1 mm with mean (± SD) 12.06 ± 1.41 mm. In females, it ranged from 8.7-14.6 mm with mean (± SD) 11.85 ± 1.32 mm while in males; it ranged from 9.1-16.1 mm with mean (± SD) 12.32 ± 1.48 mm. The study showed that width of fourth ventricle was more than the AP length and both were greater in males than in females. AP length and width showed negative correlation with age. Conclusion: The normal reference values of ventricles obtained from MRI are necessary to form the baseline data for interpreting pathological changes, planning surgery, and determining presence and progress of some neurological diseases. Furthermore, the dimension of fourth ventricle should be taken into consideration during radiological reports and during clinical examination.

Delayed Achilles tendon rupture presentation: Non-operative management may be the SMART choice

IntroductionThis biomechanical study aims to assess the function of patients who were treated non-operatively for delayed diagnosis Achilles tendon rupture. Patients were treated using the Swansea Morriston Achilles Rupture Treatment protocol (SMART), which is a physiotherapy led non-operative treatment program. Methods19 patients (16M:3F) were enrolled and prospectively assessed using Achilles Repair Scores (ARS)/Achilles Tendon Rupture Scores (ATRS) (PROMS), Ankle ROM and isokinetic peak torque for plantarflexion of the ankle. MRI scans of both the injured and uninjured TA were performed to compare both AP diameter and length. ResultsBoth ATRS and ARS improved between short- and long-term follow-up. The mean difference in plantar torque between the injured and uninjured leg was 21.9%. There was no significant difference in ankle plantarflexion or dorsiflexion. There was no significant difference in length of the injured and uninjured TA on MRI. Three patients failed the SMART protocol requiring surgical fixation. DiscussionThe SMART protocol can be an effective method of treatment even in younger and active patients especially if delay to treatment is less than 12 weeks. It may still be preferable for patients with a large gap size or high functional demand to elect for surgical intervention, but clinicians should consider the SMART protocol as an alternative to surgery and discuss it with some patients as a viable alternative.

Frontal Sinus Variations and Prevalence of Frontal Recess Cells among Adult Egyptians: Computerized Tomography Study

Abstract Background: The frontal sinus is often considered as the most challenging area to approach in Functional Endoscopic Sinus Surgery (FESS). Considerable variations in the shape, capacity and symmetry of frontal sinus have been reported. Aim of Study: To provide better understanding of frontal sinus morphometry and anatomical variations of specific frontal recess cells and their prevalence among adult Egyptians. Material and Methods: Coronal and sagittal CT scans of sixty adult persons of the Egyptian population (30 males and 30 females, assigned into Group 1; from 20 to 30 years, group 2; from 31 to 50 years and group 3; more than 50 years) were done to demonstrate the anatomy of the frontal sinus. Results: A statistically significant difference in the width of the right sinus between group 2 and group 3 was revealed. Eighty percent of frontal sinuses were asymmetrical. Agger nasi cell was the most common encountered frontal recess cell and mostly bilateraly presented. The second common was Interfrontal sinus septal cell (IFSC). Statistically significant association was found between Fronta Bullar Cell (FBC) and frontal cell type 4 (FC4) but no statistically significant differ-ence was found between males and females except for frontal cell type 3 (FC3) which was higher among females than males. Statistically significant positive correlation between A-P length of left FR and AP length of right FR was revealed, while no significant correlation was found between AP length and volume of ANC. Conclusion: Awareness of frontal sinus dimensions frontal recess cells variations among Egyptians should be taken in consideration in safe frontal endoscopic surgery.

Does the Bandeau Grow: Quantifying Postoperative Changes in the Bandeau Over Time After Fronto-orbital Advancement

INTRODUCTION: Temporal hollowing is a known late sequelae of fronto-orbital advancement (FOA) surgeries, and much work has highlighted the effect of soft tissue manipulation as a cause. However, bony manipulation including devascularization and undercorrection may also contribute to temporal hollowing. Currently no long-term quantitative assessments exist which evaluate the bony changes after FOA. We sought to objectively assess how such bony morphology changes overtime. METHODS: A multicenter, Institutional Review Board–approved retrospective study identified craniosynostosis patients treated with FOA between 2008 and 2018 at Children’s Hospital of Pittsburgh or Children’s Hospital of Philadelphia. Syndromic and nonsyndromic patients with both early postoperative and late follow-up (>12 months) head computerized tomography scans were included. Scans were reconstructed, oriented in a standardized fashion, and manually segmented into surgical fragments that delineated the osteotomies of interest for a given. Two craniofacial surgeons confirmed all segmentations and data points of interest. Thirty-two data points and 56 discreet metrics were collected from each patient and evaluated for changes over time. RESULTS: Twenty patients matched inclusion criteria (12 female:8 male). Craniosynostosis subtypes included metopic (7), unilateral coronal (6 right, 3 left), multisutural (2), sagittal (1), and sagittal and metopic (1). Mean age at surgery and time to follow-up scan were 1.4 and 2.8 years, respectively. Average growth of the inter-eurion distance and glab.-opistho. distance was 3.3% and 9.6%, respectively. The bandeau AP length increased 17.4%. Although average bitemporal width increased 9.0%, anterior bandeau width decreased by 4.1%, leading to a transverse deficiency in the anterior temporal region. The average initial zygomaticofrontal osteotomy offset was 3.9 mm laterally and 6.5 mm anteriorly; these remodeled, eliminating the gap. The average initial bandeau orbital width was 3.8 mm wider than the midface orbital width and decreased over time (≈39% loss of overcorrection). Data were significant to P < 0.05 by paired t test. CONCLUSION: The long-term shape and position of the bandeau determine surgical success of FOA. We found that the skull continues to widen bitemporally after surgery; however, widening at the anterior temporal region is negligible. This is the first comparative demonstration of the bony contribution toward temporal hollowing in early and late postoperative patients.

Airway increase after open bite closure with temporary anchorage devices for intrusion of the upper posteriors: Evidence from 2D cephalometric measurements and 3D magnetic resonance imaging.

The aim of this study was to analyse morphological changes in the upper airways in patients with anterior open bite treated with temporary anchorage devices for intrusion of upper posterior teeth. Twelve nonobese (body mass index: <25) anterior open bite patients between the ages of 19 and 44years (mean age: 22.83±8.19years) were recruited for this study. Cephalometric radiographs and magnetic resonance imaging (MRI) scans before and after anterior bite closure without bracketing on anterior teeth were used to measure the upper airway, which was divided into retropalatal and retroglossal regions. The mandibular plane angle and lower facial height were significantly reduced by intrusion of the upper posteriors and autorotation of the mandible. The retroglossal airway width (AW2) and retroglossal area (RG area) measured on cephalometric radiographs both increased significantly after treatment. Retroglossal volume increased and the retroglossal width/length ratio decreased significantly in MRI analysis. All other measurements were not significantly changed. However, no statistically significant correlations were observed between all measurements in 2D and 3D images, with the exception of the AW2 linear measurement in 2D images correlating with the AP length in MRI axial view images (r=0.56, P=0.0430). Counterclockwise rotation of the mandible after anterior open bite closed using orthodontic treatment changed the airway morphology. Retroglossal volume significantly increased and the airway shape became less elliptical after bite closure.

Foramen magnum - Dry bone study and review of studies from India

Abstract Background and Aims: Of late, there is heightened interest in foramen magnum morphology and morphometry as evidenced by innumerable publications in most of the Indian and foreign research journals publishing anatomical studies. The main objective of our study was to report the morphometric data of foramen magnum from Indian population as evidenced by dry bone study. The objective of the review was to report morphometric studies from India and to compare the data between two regions. Methodology: Forty adult dry skulls were studied for morphometric data of foramen magnum. Antero-posterior diameter and width of the foramen were considered. An extensive search for articles with foramen magnum either in the title or keywords was done using PubMed, ScienceDirect, Google Scholar, SciELO, EMBASE, and Web of Science databases was carried out in December 2017. Search terms restricted to foramen magnum morphometry in dry bones and CT scan studies. Results: The mean AP length and width of foramen magnum was 31.5 ± 3.4 mm and 27.1 ± 3 mm respectively. The mean of foramen magnum index was 1.2±0.2. Out of 37 records, 28 dry bone studies, 8 CT scan studies and one autopsy study was reviewed. A total of 2635 dry bones and 1165 CT scans were studied in 37 studies. Conclusions: There is unprecedented surge in published reports on morphometry of foramen magnum, both dry bone studies and radiological studies. There is no difference between morphometric data between dry bone studies and radiological studies. There is no significant difference between data from two states of India.

Variations in Knee Kinematics After ACL Injury and After Reconstruction Are Correlated With Bone Shape Differences.

The factors that contribute to the abnormal knee kinematics after anterior cruciate ligament (ACL) injury and ACL reconstruction remain unclear. Bone shape has been implicated in the development of hip and knee osteoarthritis, although there is little knowledge about the effects of bone shape on knee kinematics after ACL injury and after ACL reconstruction. QUESTIONS/QUESTIONS: (1) What is the relationship between bony morphology with alterations in knee kinematics after ACL injury? (2) Are baseline bone shape features related to abnormal knee kinematics at 12 months after ACL reconstruction? Thirty-eight patients (29 ± 8 years, 21 men) were prospectively followed after acute ACL injury and before ligamentous reconstruction. Patients were excluded if there was a history of prior knee ligamentous injury, a history of inflammatory arthritis, associated meniscal tears that would require repair, or any prior knee surgery on either the injured or contralateral side. In total, 54 patients were recruited with 42 (78%) patients completing 1-year followup and four patients excluded as a result of incomplete or unusable imaging data. MR images were obtained for the bilateral knees at two time points 1 year apart for both the injured (after injury but before reconstruction and 1 year after reconstruction) and contralateral uninjured knees. Kinematic MRI was performed with the knee loaded with 25% of total body weight, and static images were obtained in full extension and in 30° of flexion. The side-to-side difference (SSD) between tibial position in the extended and flexed positions was determined for each patient. Twenty shape features, referred to as modes, for the tibia and femur each were extracted independently from presurgery scans with the principal component analysis-based statistical shape modeling algorithm. Spearman rank correlations were used to evaluate the relationship between the SSD in tibial position and bone shape features with significance defined as p < 0.05. Each of the shape features (referred to as the bone and mode number such as Femur 18 for the 18th unique femoral bone shape) associated with differences in tibial position was then investigated by modeling the mean shape ± 3 SDs. Two of the 20 specific femur bone shape features (Femur 10, Femur 18) and two of the 20 specific tibial bone shape features (Tibia 19, Tibia 20) were associated with an increasingly anterior SSD in the tibial position for the patients with ACL injury before surgical treatment. The shape features described by these modes include the superoinferior height of the medial femoral condyle (Femur 18; ρ = 0.33, p = 0.040); the length of the anterior aspect of the lateral tibial plateau (Tibia 20; ρ = -0.35, p = 0.034); the sphericity of the medial femoral condyle (Femur 10; ρ = -0.52, p < 0.001); and tibial slope (Tibia 19; ρ = 0.34; p = 0.036). One year after surgical treatment, there were two of 20 femoral shape features that were associated with SSD in the tibial position in extension (Femur 10, Femur 18), one of 20 femoral shape features associated with SSD in the tibial position in flexion (Femur 10), and three of 20 tibial shape features associated with SSD in the tibial position in flexion (Tibia 2, Tibia 4, Tibia 19). The shape features described by these modes include the sphericity of the medial femoral condyle (Femur 10; ρ = -0.38, p = 0.020); the superoinferior height of the medial femoral condyle (Femur 18; ρ = 0.34, p = 0.035); the height of the medial tibial plateau (Tibia 2; ρ = -0.32, p = 0.048); the AP length of the lateral tibial plateau (Tibia 4; ρ = -0.37, p = 0.021); and tibial slope (Tibia 19; ρ = 0.34, p = 0.038). We have observed multiple bone shape features in the tibia and the femur that may be associated with abnormal knee kinematics after ACL injury and ACL reconstruction. Future directions of research will include the influence of bony morphology on clinical symptoms of instability in patients with and without ACL reconstruction and the long-term evaluation of these shape factors to better determine specific contributions to posttraumatic arthritis and graft failure. Level II, therapeutic study.

Distinct Proximal Humeral Geometry in Chinese Population and Clinical Relevance.

Replicating humeral anatomy during shoulder arthroplasty is important for good patient outcomes. The proximal humeral geometry of the Chinese population has been rarely reported. We analyzed the geometry of the proximal part of the humerus in Chinese subjects and compared it with that of Western populations and the dimensions of available prostheses. Eighty healthy Chinese subjects underwent computed tomography (CT)-arthrography. Three-dimensional (3D) digital humeral and glenoid models were reconstructed, and geometric parameters were measured. Humeral measurements included the radius of curvature, articular surface diameter and thickness, anterior-posterior/superior-inferior (AP/SI) articular surface diameter ratio, articular surface thickness/radius of curvature ratio, surface arc, inclination angle, retroversion angle, and medial and posterior offsets. Glenoid measurements included SI length, AP length, SI radius, and AP radius. The average radius of curvature (and standard deviation) of the humeral head was 22.1 ± 1.9 mm, the articular surface diameter averaged 42.9 ± 3.6 mm, and the articular surface thickness averaged 16.9 ± 1.5 mm. There was strong linear correlation between the articular surface diameter and thickness (r = 0.696, p = 0.001), with a linear regression relationship of thickness = 0.357 × diameter + 1.615. The AP/SI articular surface diameter ratio averaged 0.93 ± 0.03; the articular surface thickness/radius of curvature ratio, 0.77 ± 0.05; the surface arc, 153° ± 5.6°; the inclination angle, 133° ± 3.1°; and the retroversion angle, 22.6° ± 10.2°. The medial and posterior offsets averaged 6.3 ± 0.9 mm and 0.4 ± 0.78 mm, respectively; the SI and AP lengths, 30.15 ± 3.70 mm and 20.35 ± 2.56 mm; and the SI and AP radii, 23.49 ± 2.48 mm and 25.54 ± 3.07 mm. Compared with the Western population, the Chinese cohort had a smaller radius of curvature (p < 0.001), smaller articular surface diameter (p = 0.009), larger articular surface thickness/radius of curvature ratio (p < 0.001), larger surface arc (p < 0.001), smaller inclination angle (p < 0.001), and smaller posterior offset (p < 0.001). Unlike the Western population, the Chinese population had higher glenohumeral conformity in the coronal plane than in the axial plane. Many manufacturers' shoulder prostheses do not adequately cover the range of humeral head dimensions in our Chinese cohort. The geometric parameters of the humeri in the Chinese population differ from those in other populations. These differences have clinical relevance with regard to implant design and arthroplasty technique and likely affect clinical outcomes.

Triple-Loaded Single-Row versus Suture-Bridge Double-Row Rotator Cuff Tendon Repair with Platelet Rich Plasma Fibrin Membrane: A Randomized Control Trial

Triple-Loaded Single-Row versus Suture-Bridge Double-Row Rotator Cuff Tendon Repair with Platelet Rich Plasma Fibrin Membrane: A Randomized Control Trial

Immediate Effectiveness of Humming on the Supraglottic Compression in Subjects with Muscle Tension Dysphonia

Aims: To verify whether humming corrects supraglottic compression in muscle tension dysphonia (MTD) patients. Methods: We enrolled 23 MTD participants (13 male, 10 female) showing supraglottic compression. Each individual was instructed to perform 3 types of phonation under transnasal laryngofiberscopy: natural phonation, humming phonation without pitch change and subsequent um-hum phonation, i.e. humming with pitch glide up as if agreeing with someone. The degree of supraglottic compression was estimated with 2 parameters. The false vocal fold and anterior-posterior indices (the FVF and AP indices) were calculated by normalizing the lateral width and AP length of the visible vocal cords at phonation normalized to the mean vocal cord length at inspiration, respectively. These indices were compared among the tasks. Results: All the MTD participants but 5 females accomplished decreases in the vocal roughness scores upon the phonatory tasks. The whole MTD group showed significant increases in the FVF and AP indices even after humming without pitch change with a dominance of the AP index. The humming-responsive MTD subgroup showed greater increases in both indices than the humming-resistant subgroup. Conclusion: These data demonstrate that humming corrects both the lateral and AP components of supraglottic compression in most MTD patients.

Gender differences of the morphology of the distal femur and proximal tibia in a Korean population

PurposeWe conducted this study to determine whether the sizes of distal femurs and proximal tibiae in Korean men and women are different, and to assess suitability of the sizes of prostheses currently used in Korea. Materials and methodsWe performed morphological analysis of proximal tibia and distal femur on 115 patients (56 male, 59 female) using MRI to investigate a gender difference. Tibial mediolateral dimension (tMAP), tibial medial anteroposterior dimension (tMAP), tibial lateral anteroposterior dimension (tLAP) femoral mediolateral dimension (fML), femoral medial anteroposterior dimension (fMAP), and femoral lateral anteroposterior dimension (fLAP) were measured. The ratio of tMAP and tLAP to tML (plateau aspect ratio, tAP/tML×100%), and that of fMAP and fLAP to fML (condylar aspect ratio, fAP/fML×100%) were calculated. The measurements were compared with the similar dimensions of four total knee implants currently used. ResultsThe tML and tAP lengths showed a significant gender difference (P<0.05). The plateau aspect ratio (tMAP/tML) revealed a significant difference between male (0.74±0.05) and female (0.68±0.04, P<0.05). For morphotype of distal femur, males were found to have significantly large values (P<0.05) in the parameters, except for fLAP. With regards to the ratio of the ML width to the AP length, the women showed a narrower ML width than the men. Both genders were distributed within the range of the dimensions of the prostheses currently used prostheses. ConclusionsKorean population revealed that women have smaller dimensions than male counterparts. In both genders, a relatively small size of prostheses matches distal femur and proximal tibia better among the implants currently used in Korea.