Comparative analysis of tension band wiring and hook plate fixation in ulnar styloid fractures: a focus on fracture type.

INTRODUCTION: Various surgical techniques for ulnar styloid fractures (USFs) fixation have recently been developed, the actual clinical outcomes have not been discussed in detail. This study aimed to compare the outcomes of tension band wiring (TBW) and hook plate fixation in the treatment of USFs and to explore effective management strategies for these fractures. MATERIALS AND METHODS: We retrospectively reviewed 109 patients with styloid process fractures from March 2016 to July 2020. Among them, patients aged 21-75 years who required surgical intervention for USFs with distal radioulnar joint (DRUJ) instability, with or without accompanying distal radius fracturs (DRFs), were included. The patients were treated with either TBW (group T) or hook plate fixation (group P). The fractures were classified into four types based on their location and complexity. Postoperative assessments were conducted using radiographic analysis to monitor fracture healing. Clinical evaluations, including range of motion (ROM), grip strength, and patient-reported outcomes using the disabilities of the arm, shoulder, and hand scores and the visual analog scale for pain, were performed, at multiple time points up to a year after surgery. Statistical analyses were conducted to compare outcomes across fracture types and treatment methods. RESULTS: Osseous union was achieved in 96% of the patients. Specifically, the time to union in types 3 and 4 fractures was significantly shorter in group P than in group T. Functionally, ROM assessments showed similar flexion-extension in both groups but better pronation-supination in group T. Grip strength and patient-reported outcomes did not show significant differences between the groups. CONCLUSIONS: TBW offers slight ROM benefits for type 2 USFs, whereas hook plate fixation provides superior stability for complex types 3 and 4 USFs. Despite the minimal differences in ROM, the enhanced advantages of the hook plate fixation make it the preferred choice for severe fractures, ensuring faster healing.

Exercise attenuates high-fat diet-induced PVAT dysfunction through improved inflammatory response and BMP4-regulated adipose tissue browning.

Background: Perivascular adipose tissue (PVAT) dysfunction impairs vascular homeostasis. Impaired inflammation and bone morphogenetic protein-4 (BMP4) signaling are involved in thoracic PVAT dysfunction by regulating adipokine secretion and adipocyte phenotype transformation. We investigated whether aerobic exercise training could ameliorate high-fat diet (HFD)-induced PVAT dysfunction via improved inflammatory response and BMP4-mediated signaling pathways. Methods: Sprague-Dawley rats (n = 24) were divided into three groups, namely control, high-fat diet (HFD), and HFD plus exercise (HEx). After a 6-week intervention, PVAT functional efficiency and changes in inflammatory biomarkers (circulating concentrations in blood and mRNA expressions in thoracic PVAT) were assessed. Results: Chronic HFD feeding caused obesity and dyslipidemia in rats. HFD decreased the relaxation response of PVAT-containing vascular rings and impaired PVAT-regulated vasodilatation. However, exercise training effectively reversed these diet-induced pathological changes to PVAT. This was accompanied by significantly (p < 0.05) restoring the morphological structure and the decreased lipid droplet size in PVAT. Furthermore, HFD-induced impaired inflammatory response (both in circulation and PVAT) was notably ameliorated by exercise training (p < 0.05). Specifically, exercise training substantially reversed HFD-induced WAT-like characteristics to BAT-like characteristics as evidenced by increased UCP1 and decreased FABP4 protein levels in PVAT against HFD. Exercise training promoted transcriptional activation of BMP4 and associated signaling molecules (p38/MAPK, ATF2, PGC1α, and Smad5) that are involved in browning of adipose tissue. In conjunction with gene expressions, exercise training increased BMP4 protein content and activated downstream cascades, represented by upregulated p38/MAPK and PGC1α proteins in PVAT. Conclusion: Regular exercise training can reverse HFD-induced obesity, dyslipidemia, and thoracic PVAT dysfunction in rats. The browning of adipose tissue through exercise appears to be modulated through improved inflammatory response and/or BMP4-mediated signaling cascades in obese rats.

Scapholunate Ligament Reconstruction With Internal Brace Augmentation Techniques for Chronic Scapholunate Dissociation: A Clinical Follow-up Study.

INTRODUCTION: The scapholunate ligament is the most important stabilizer of the scapholunate articulation. The management of chronic irreversible injuries of this ligament in the absence of preexisting arthritis of the wrist joint remains controversial. Recently, surgeons introduced a novel surgical technique using an internal brace (IB). Several biomechanical studies on this technique have been conducted using cadavers; however, very few studies have discussed the results in detail in actual clinical practice. Therefore, herein, we investigated the radiological and functional results of patients who underwent IB augmentation as a treatment for chronic scapholunate dissociation. METHODS: This retrospective study was conducted from April 2018 to May 2022. Twenty-two patients with chronic scapholunate dissociation were treated using the IB augmentation technique, of whom 17 were followed-up for at least 1 year. Radiological results, including scapholunate distance, scapholunate angle, and radioscaphoid angle, were collected. Furthermore, clinical parameters, such as the visual analog scale (preoperative and at final follow-up), the Disabilities of the Arm, Shoulder, and Hand scores (preoperatively and at 3, 6, and 12 months postoperatively), and Mayo wrist scores (preoperative and at final follow-up), were measured. RESULTS: The scapholunate distance increased significantly in the affected wrist compared to the unaffected wrist, which improved after reconstruction in all wrist positions ( P < 0.05). Compared to the unaffected wrist, the scapholunate angle increased significantly in all positions ( P < 0.05) except for extension ( P = 0.535) and improved after reconstruction in all wrist positions. The radioscaphoid angle significantly increased compared to the angle of the unaffected wrist in all positions ( P < 0.05) except for extension ( P = 0.602) and clenched fist ( P = 0.556). This angle improved after reconstruction in all wrist positions except for extension ( P = 0.900). The visual analog scale score (7-2, preoperatively and at final follow-up) and Mayo wrist score (53-82, preoperatively and at final follow-up) improved after surgery. The Disabilities of the Arm, Shoulder, and Hand scores also improved after surgery (68, 53, 30, 7, preoperatively and at 3, 6, and 12 months postoperatively). CONCLUSIONS: This study revealed that scapholunate ligament reconstruction using an autologous tendon and suture tape is a good reconstruction technique that can improve clinical symptoms and radiographic parameters with a shorter operation time and fewer complications than other reconstruction methods.

Post-Traumatic Chylous Wrist Effusion: A Case Report.

Chylous joint effusion is a rare condition characterized by the presence of a milky, viscous synovial fluid with abnormal lipid concentrations. The thorax is the most common site of involvement. Only a handful of cases have been reported in the field of orthopedic surgery and even fewer have been reported involving uncommon locations such as the knee. Treatment of chylous joint effusion may require surgical intervention along with the use of somatostatin or octreotide and a low-fat diet. We present herein a case of post-traumatic chylous effusion in the wrist treated with surgical incision and drainage, octreotide, and a low-fat diet. There have been few reports of chylous effusion in the knee; however, to our knowledge, this is the first report of post-traumatic chylous effusion in the wrist.

Is arthritis an associated risk factor for trigger finger occurrence after carpal tunnel release? A nationwide, population-based study in Korea.

PURPOSE: We hypothesized that increased friction between the flexor tendon and surrounding structures due to hand arthritis is an important risk factor for trigger finger (TF) after carpal tunnel release (CTR). Therefore, we compared TF development according to the presence or absence of arthritis in carpal tunnel syndrome (CTS) patients treated with CTR. METHODS: This retrospective study was based on data collected from the National Health Insurance Service-National Sample Cohort (NHIS-NSC) in the Republic of Korea between January 1, 2002, and December 31, 2015. Patients diagnosed with TF between one month and one year after the CTR date or with a history of surgery were included in the study. During subsequent follow-up, the patients were divided into subgroups of those (1) with TF and (2) without TF. Sex, age, arthritis, and TF-related comorbidities were compared between the subgroups. RESULTS: The subgroup with TF had a higher proportion of women (9.43% vs 90.57%), the highest age range between 50 and 59 years, more cases of arthritis (32.55% vs 16.79%), and a higher proportion of patients with hypothyroidism (10.85% vs 4.60%) than the group without TF. The association between arthritis and TF after CTR was examined using a multivariate logistic regression model, showing arthritis to be a significant risk factor for TF after CTR (odds ratio, 1.35; P = 0.049). CONCLUSIONS: We identified arthritis as an important risk factor for the development of TF after CTR.

Do multiple fractures affect risk of fixation failure after surgical treatment of midshaft clavicle fracture? A retrospective cohort study.

BACKGROUND: Surgical treatment of midshaft clavicle fractures is associated with quick recovery and low risk of non-union. However, fixation failure may occur in case of severe comminution fractures. Moreover, clinical outcomes may be affected when clavicle fractures occur in combination with other injuries, particularly those involving the lower extremities, as the use of crutches or walkers may hinder the process of rehabilitation by adding strain on the acromioclavicular (AC) joint, resulting in possible fixation failure. This study aims to identify risk factors for fixation failure of midshaft clavicle fractures and elucidate the role of combined fractures in treatment outcomes. METHODS: This study included patients diagnosed with midshaft clavicle fractures who underwent initial surgery between January 2012 and November 2021 at a designated regional trauma center hospital. Retrospective evaluation of fixation failure was carried out in 352 patients with midshaft clavicle fractures using standard clinical evaluation protocols and conventional radiographs. The prevalence of fixation failure and the effects of several demographic variables on the risk of fixation failure and non-union were examined. Multivariate logistic regression analysis was carried out to identify independent risk factors for fixation failure. RESULTS: Fixation failure occurred in 40 patients (11.4%). Multivariate analysis identified comminution [odds ratio (OR) 3.532, p value = 0.003, 95% confidence interval (CI) 1.55-8.05)] and fewer number of screws (OR 0.223, p value = 0.022, 95% CI 0.06-0.80) as risk factors for fixation failure. Surgical techniques using wire cerclage reduced the chances of fixation failure in comminuted fractures (OR 0.63, p value = 0.033, 95% CI 0.05-0.80). Combined fractures that required rehabilitation using walkers or crutches increased the risk of non-union (OR 19.043, p value = 0.032, 95% CI 1.28-282.46). CONCLUSIONS: Additional fixation of comminuted fractures using cerclage can reduce the risk of treatment failure, while multiple fractures or rehabilitation for ambulation increases the risk of the same. LEVEL OF EVIDENCE: III.

Increase in Cape Verde hurricanes during Atlantic Niño.

At seasonal-to-interannual timescales, Atlantic hurricane activity is greatly modulated by El Niño-Southern Oscillation and the Atlantic Meridional Mode. However, those climate modes develop predominantly in boreal winter or spring and are weaker during the Atlantic hurricane season (June-November). The leading mode of tropical Atlantic sea surface temperature (SST) variability during the Atlantic hurricane season is Atlantic Niño/Niña, which is characterized by warm/cold SST anomalies in the eastern equatorial Atlantic. However, the linkage between Atlantic Niño/Niña and hurricane activity has not been examined. Here, we use observations to show that Atlantic Niño, by strengthening the Atlantic inter-tropical convergence zone rainband, enhances African easterly wave activity and low-level cyclonic vorticity across the deep tropical eastern North Atlantic. We show that such conditions increase the likelihood of powerful hurricanes developing in the deep tropics near the Cape Verde islands, elevating the risk of major hurricanes impacting the Caribbean islands and the U.S.

Selective Denervation for the Thumb Carpometacarpal Joint: Clinical Outcome and Comparison Based on Eaton Stage.

PURPOSE: Various operative treatment options for advanced thumb carpometacarpal (CMC) joint arthritis have been presented without a definite surgical guideline. Selective denervation is a less invasive method for thumb CMC arthritis. However, it is unclear whether the clinical outcome varies with the stage of thumb CMC arthritis. This study aimed to evaluate the effectiveness of selective denervation on CMC arthritis for pain relief and functional outcome and to determine whether selective denervation depends on the stage of thumb CMC arthritis. METHODS: We evaluated 29 thumbs of 28 patients with thumb CMC arthritis treated with selective denervation. The disease stage was determined with the classification system described by Eaton. The denervation was performed in the articular branches of the palmar cutaneous branch of the median nerve, lateral antebrachial cutaneous nerve, and superficial branch of radial nerve. The clinical outcomes were evaluated using the visual analog scale (VAS) and Disabilities of the Arm, Shoulder, and Hand (DASH) scores, along with evaluation of the improvement in both postoperative range of motion and strength recovery. RESULTS: The mean duration of follow-up was 24 months (range, 18-48 months). The average VAS and DASH scores decreased from 6.1 to 1.3 and from 54.3 to 24.1, respectively. The range of motion during palmar abduction and opposition of the metacarpophalangeal joint improved with an increase in mean value from 44.1 to 53.7 degrees, and the Kapandji score increased from 7.2 to 9.2, respectively. The grip and key pinch strengths increased from mean preoperative values of 14.3 and 3.1 kg to 27.1 and 6.2 kg, respectively, as measured at the 12-month follow-up. The rate of change in the VAS and DASH scores was significantly higher in stages I to III than in stage IV ( P = 0.01, P < 0.01, respectively). CONCLUSION: The selective denervation for thumb CMC arthritis was effective in pain relief and functional recovery with several advantages, including less invasive procedure, quick recovery time, and regaining of strength. The clinical outcomes were more effective in the early-stage group (Eaton stages I and II) compared with the advance-stage group (Eaton stages III and IV).

The clinical necessity of a distal forearm DEXA scan for predicting distal radius fracture in elderly females: a retrospective case-control study.

BACKGROUND: Recent studies have demonstrated that the distal forearm dual-energy X-ray absorptiometry (DEXA) scan might be a better method for screening bone mineral density (BMD) and the risk of a distal forearm fracture, compared with a central DEXA scan. Therefore, the purpose of this study was to determine the effectiveness of a distal forearm DEXA scan for predicting the occurrence of a distal radius fracture (DRF) in elderly females who were not initially diagnosed with osteoporosis after a central DEXA scan. METHODS: Among the female patients who visited our institutes and who were over 50 years old and underwent DEXA scans at 3 sites (lumbar spine, proximal femur, and distal forearm), 228 patients with DRF (group 1) and 228 propensity score-matched patients without fractures (group 2) were included in this study. The patients' general characteristics, BMD, and T-scores were compared. The odds ratios (OR) of each measurement and correlation ratio among BMD values of the different sites were evaluated. RESULTS: The distal forearm T-score of the elderly females with DRF (group 1) was significantly lower than that of the control group (group 2) (p < 0.001 for the one-third radius and ultradistal radius measurements). BMD measured during the distal forearm DEXA scan was a better predictor of DRF risk than BMD measured during the central DEXA (OR = 2.33; p = 0.031 for the one-third radius, and OR = 3.98; p < 0.001 for the ultradistal radius). The distal one-third radius BMD was correlated with hip BMD, rather than lumbar BMD (p < 0.05 in each group). CONCLUSION: Performing a distal forearm DEXA scan in addition to a central DEXA scan appears to be clinically significant for detecting the low BMD in the distal radius, which is associated with osteoporotic DRF in elderly females. LEVEL OF EVIDENCE: III; case-control study.

Management of Hardware-Exposed Soft Tissue Defects Using Dermal Substitutes and Negative Pressure Wound Therapy.

INTRODUCTION: Reconstruction of complex injuries of the extremities with full-thickness wounds is a challenging but important task. If primary closure is not feasible, more complex procedures are required, such as split-thickness skin graft or flap surgery. Recently, several studies have shown good results when combined with negative pressure wound therapy (NPWT) and artificial dermal replacement therapy after extensive surgical debridement and NPWT administration for severe complex wounds accompanied by tendon or bone exposure. However, flap surgery remains the only treatment for wounds in which the hardware is exposed after fracture fixation. Therefore, in this study, we attempted to prove the usefulness of the combined treatment using artificial dermal substitutes (MatriDerm) and NPWT by focusing on hardware-exposed wounds, which have not been studied before. METHODS: From 2019 to 2021, we treated with our wound management procedure 14 patients with hardware-exposing wounds after internal fixation using plates, out of 48 patients with full-thickness posttraumatic skin defect. Before skin grafting, after surgical debridement and thorough washouts, MatriDerm was placed and NPWT was applied over it. This staged approach aimed at conditioning even the most complex wounds so that closure with MatriDerm-augmented skin grafting would become possible in a one-step approach. RESULTS: We stratified the duration of treatment and number of replacements in NPWT according to the type of injury. Cases with open fractures required significantly longer NPWT than those with closed fractures (P = 0.01); however, there was no significant difference between the Gustilo-Anderson classification within open fractures (P > 0.05). Patients with open fractures underwent a mean of 6.6 changes while those with closed fractures underwent 2.5 (P = 0.002) until the final wound closure with MatriDerm-augmented skin grafting was performed. There was no significant difference in the treatment period based on the location and size of the wound, and there was no significant difference in the number of NPWT replacements. Skin grafting was successful in all 14 patients. CONCLUSIONS: This study revealed that NPWT and artificial dermis-augmented skin grafting after combined treatment with NPWT and artificial dermis were sufficiently useful for hardware-exposed wounds, where flap surgery has been considered the only treatment to date.

Carpal tunnel release under wide awake local anesthesia with no tourniquet in hemodialysis patients with arteriovenous shunt.

INTRODUCTION: Long-term hemodialysis patients experience many hand diseases caused by dialysis-related amyloidosis (DRA), with carpal tunnel syndrome (CTS) being the most common. For the patients with arteriovenous (AV) shunt, surgical decompression remains challenging because of the contraindications of a tourniquet. A technique called wide-awake local anesthesia with no tourniquet (WALANT), in which epinephrine provides hemostasis instead of the tourniquet, can be a good option for hemodialysis patients. The purpose of this study was to assess the prevalence of CTS and related factors in hemodialysis patients, and to establish the efficacy and safety of WALANT on hemodialysis patients with AV shunt. MATERIALS AND METHODS: This prospective study included 275 hemodialysis patients between March 2013 and July 2019. 43 patients were diagnosed with CTS, involving surgical treatment on 70 wrists. We performed mini-open carpal tunnel release using WALANT on the AV shunt arm (defined as the WALANT group), while using lidocaine and a tourniquet on the arm without an AV shunt (defined as the tourniquet group). The operative time, surgical field bleeding (blood loss and hemostasis score), surgical pain (injection pain and tourniquet pain), outcomes, complications, and satisfaction were compared between the two groups. RESULTS: The incidence of CTS in hemodialysis patients was 15.6%. Longer dialysis durations were related to higher proportions of patients with CTS. There was no significant difference in blood loss (p=0.184) and hemostasis score (p=0.165) between the two groups. Clinical symptoms improved in all patients, and there were no severe complications. The WALANT group had a significantly longer preparation time of approximately 20minutes, but they had low injection pain and no tourniquet pain. There was also no significant difference in terms of satisfaction levels (p=0.212). DISCUSSION: CTS is a very common disease among hemodialysis patients. WALANT provided sufficient hemostasis without a tourniquet, despite the patients' high bleeding tendency. The technique also had the advantages of low injection pain, no tourniquet pain, and no major complications. In this respect, WALANT can be a good choice for hemodialysis patients with AV shunt. LEVEL OF EVIDENCE: II.

Atypical fractures of the ulna: Effect of bowing of the ulna on fracture location and occurrence.

INTRODUCTION: Ulnar fractures associated with long-term bisphosphonate (BPs) therapy are rare, and the nature and extent of this potential risk remains unknown. Although ulna is generally considered a "straight bone", it actually features a bow anatomically. For this reason, we speculated that ulnar bow may have a role in the development of atypical ulnar fractures (AUFs). Therefore, we compared the location and depth of ulnar bow between AUF patients and patients with atypical fractures other than the ulna. We aimed to answer: (1) whether a correlation exists between the location of the ulna bow and the location of AUFs, (2) whether the degree of ulnar bow affects the occurrence of AUFs. HYPOTHESIS: Ulnar bowing could play a critical role in the location and occurrence of AUFs. METHODS: We retrospectively reviewed the radiographs and medical records of 64 patients with atypical fractures admitted to our department between May 2010 to July 2020. The bow of the ulna was measured using anteroposterior (AP) and lateral radiographs. Bone angulation was described as apex of deformity, with apex lateral bow designated as AP plane bowing and apex posterior bow marked as lateral plane bowing. RESULTS: In all patients with atypical fractures, bow locations were measured at the proximal third level to the index line in 68% of AP plane and 72% of lateral plane. In patients with AUFs, fracture sites occurred in the range of 20% to<40%, except in one patient. Fracture site versus apex lateral bow location and fracture site versus apex posterior bow location showed a statistically significant correlation coefficient of 0.81 (p<0.001) and 0.69 (p=0.003), respectively. In lateral plane, there was a significant difference between AUF patients and patients with atypical fractures other than the ulna in ulnar bow depth (p=0.014). However, no statistically significant differences were found in AP plane (p=0.110). DISCUSSION: In AUFs, fracture site was highly correlated with ulnar bowing location, and, as the degree of apex posterior bow increased, occurrence of AUFs increased. These findings are helpful in understanding the role of bowing as the ulnar geometry in the development of AUF and early identification of the location of suspicious AUF. LEVEL OF EVIDENCE: IV.

The influence of accelerometer epoch length on physical activity output in adolescent athletes.

Epoch in accelerometer measurements is an important option that affects the results of physical activity (PA) analysis. Many studies have been conducted to investigate the effect of epoch on PA output in adolescents, but few have been performed on highly active youth athletes. We aimed to examine the differences in energy expenditure and time spent in different activity intensities by applying various epoch lengths in adolescent athletes. The participants of this study comprised 31 male athletes aged 12 to 13 in basketball, soccer, and taekwondo teams. Athletes wore a tri-axial accelerometer attached to the right hip for 6 to 7 consecutive days, including sleeping time. Subsequently, the recorded data from the accelerometer were downloaded using the ActiLife software and analyzed by varying the epoch to 1, 10, 30, and 60 sec. Daily average metabolic equivalents (METs) increased as the epoch increased (F=2.918, P=0.037), showing a significant difference between 1 and 60-sec epochs. As epoch length increased, sedentary (0-1.5 METs) (F=94.001, P=0.000) and high intensity (6 METs and higher) activity time (F=3.536, P=0.017) decreased, while low (1.5-3 METs) (F=173.949, P= 0.000), moderate (3-6 METs) (F=70.792, P=0.000), and moderate-to-vigorous activity (3 METs and higher intensity) (F=34.683, P=0.000) times increased. Comparing PA among adolescent athletes by varying epoch settings of accelerometers revealed differences in PA levels and time spent in different activity intensities. Future studies should consider the characteristic changes in the PA outputs according to the epoch length in very active adolescent athletes.

Projections of faster onset and slower decay of El Niño in the 21st century.

Future changes in the seasonal evolution of the El Niño-Southern Oscillation (ENSO) during its onset and decay phases have received little attention by the research community. This work investigates the projected changes in the spatio-temporal evolution of El Niño events in the 21st Century (21 C), using a multi-model ensemble of coupled general circulation models subjected to anthropogenic forcing. Here we show that El Niño is projected to (1) grow at a faster rate, (2) persist longer over the eastern and far eastern Pacific, and (3) have stronger and distinct remote impacts via teleconnections. These changes are attributable to significant changes in the tropical Pacific mean state, dominant ENSO feedback processes, and an increase in stochastic westerly wind burst forcing in the western equatorial Pacific, and may lead to more significant and persistent global impacts of El Niño in the future.

A randomized controlled trial of three different local anesthetic methods for minor hand surgery.

Purpose: Hemostasis and local anesthetic injection are essential for minor hand surgeries under local anesthesia (LA). Wide awake local anesthesia no tourniquet (WALANT) became popular for achieving hemostasis without a tourniquet. However, a recent study reported that injection is more painful than tourniquet use in minor hand surgery. Therefore, this study aimed to compare three LA methods that differ according to injection and hemostasis, namely, the combination of a tourniquet and buffered lidocaine solution (CTB), WALANT, and conventional LA. Methods: This randomized prospective single-center study included 169 patients who underwent minor hand surgery between 2017 and 2020. We randomly allocated the patients to each group and recorded the pain and anxiety score during the surgery, as well as satisfaction after the surgery. Results: Pure lidocaine injection was significantly more painful than buffered lidocaine and WALANT solution injection (p < 0.001). Local anesthesia injection was significantly more painful than tourniquet use in all groups (p < 0.001). The intraoperative anxiety score was significantly lower in the CTB group than in the conventional LA and WALANT groups (p < 0.001). The satisfaction score was significantly higher in the CTB and WALANT groups than in the conventional LA group (p < 0.001). Conclusion: CTB for minor hand surgery under LA is associated with less injection pain and patient anxiety. The tourniquet is tolerable without much pain and waiting time. Thus, CTB in minor hand surgery is a good alternative to WALANT and conventional LA.

A Comparison of Pronator Quadratus Preservation and Dissection Approaches for Volar Plating of Comminuted Intra-articular Distal Radius Fracture.

PURPOSE: Although the pronator quadratus (PQ) preservation approach for volar plating of distal radius fracture has been commonly used recently, its superiority to the conventional PQ dissection approach, especially for comminuted intra-articular distal radius fractures, has not been well established. The purpose of this study was to assess the efficacy of PQ preservation for comminuted intra-articular fractures and to evaluate the healed PQ during hardware removal surgery. MATERIALS AND METHODS: From January 2014 to March 2019, 86 patients who underwent both volar plating for AO Foundation/Orthopedic Trauma Association classification type C2 or C3 distal radius fractures and subsequent hardware removal were assessed in this study. Radiographic measurements, clinical outcomes at each follow-up, and the integrity of healed PQ during hardware removal were compared between the PQ dissection (group D) and PQ preservation (group P) groups. RESULTS: Complete union with acceptable reduction on radiographic measurements was achieved in both groups. Group P showed a statistically significant earlier recovery of clinical outcomes at 2 weeks and 1 month postoperatively and improved anatomical restoration of PQ muscle covering the plate, which was identified during hardware removal surgery. Flexor tendon rupture was identified in 2 patients (5%) and tenosynovitis in 6 patients (14%) in group D; no patient had flexor tendon rupture (0%), and 2 patients (5%) had tenosynovitis in group P. CONCLUSIONS: Pronator quadratus preservation approach for volar plating is easily applicable and useful even for comminuted intra-articular distal radius fractures and is helpful for earlier restoration of wrist function and in preventing flexor tendon problems in the latter postoperative period.

Unprecedented reduction and quick recovery of the South Indian Ocean heat content and sea level in 2014-2018.

Following the onset of the strong 2014-2016 El Niño, a decade-long increase of the basin-wide sea level and heat content in the subtropical southern Indian Ocean (SIO) in 2004-2013 ended with an unprecedented drop, which quickly recovered during the weak 2017-2018 La Niña. Here, we show that the 2014-2016 El Niño contributed to the observed cooling through an unusual combination of both the reduced heat advection from the Pacific (dominant in the eastern SIO) and the basin-wide cyclonic wind anomaly that led to shoaling of isotherms (dominant in the western SIO). The ensuing recovery was mainly forced by an anticyclonic wind anomaly associated with stronger trade winds that caused deepening of isotherms and upper-ocean warming, effectively suppressing the 2014-2016 cooling signal propagating from the eastern boundary. The results presented here highlight the complexity of the SIO heat content variability driven by remote and local forcing.

Revealing Metabolic Perturbation Following Heavy Methamphetamine Abuse by Human Hair Metabolomics and Network Analysis.

Methamphetamine (MA) is a highly addictive central nervous system stimulant. Drug addiction is not a static condition but rather a chronically relapsing disorder. Hair is a valuable and stable specimen for chronic toxicological monitoring as it retains toxicants and metabolites. The primary focus of this study was to discover the metabolic effects encompassing diverse pathological symptoms of MA addiction. Therefore, metabolic alterations were investigated in human hair following heavy MA abuse using both targeted and untargeted mass spectrometry and through integrated network analysis. The statistical analyses (t-test, variable importance on projection score, and receiver-operator characteristic curve) demonstrated that 32 metabolites (in targeted metabolomics) as well as 417 and 224 ion features (in positive and negative ionization modes of untargeted metabolomics, respectively) were critically dysregulated. The network analysis showed that the biosynthesis or metabolism of lipids, such as glycosphingolipids, sphingolipids, glycerophospholipids, and ether lipids, as well as the metabolism of amino acids (glycine, serine and threonine; cysteine and methionine) is affected by heavy MA abuse. These findings reveal crucial metabolic effects caused by MA addiction, with emphasis on the value of human hair as a diagnostic specimen for determining drug addiction, and will aid in identifying robust diagnostic markers and therapeutic targets.

Honokiol ameliorates angiotensin II-induced hypertension and endothelial dysfunction by inhibiting HDAC6-mediated cystathionine γ-lyase degradation.

Hypertension and endothelial dysfunction are associated with various cardiovascular diseases. Hydrogen sulphide (H2 S) produced by cystathionine γ-lyase (CSE) promotes vascular relaxation and lowers hypertension. Honokiol (HNK), a natural compound in the Magnolia plant, has been shown to retain multifunctional properties such as anti-oxidative and anti-inflammatory activities. However, a potential role of HNK in regulating CSE and hypertension remains largely unknown. Here, we aimed to demonstrate that HNK co-treatment attenuated the vasoconstriction, hypertension and H2 S reduction caused by angiotensin II (AngII), a well-established inducer of hypertension. We previously found that histone deacetylase 6 (HDAC6) mediates AngII-induced deacetylation of CSE, which facilitates its ubiquitination and proteasomal degradation. Our current results indicated that HNK increased endothelial CSE protein levels by enhancing its stability in a sirtuin-3-independent manner. Notably, HNK could increase CSE acetylation levels by inhibiting HDAC6 catalytic activity, thereby blocking the AngII-induced degradative ubiquitination of CSE. CSE acetylation and ubiquitination occurred mainly on the lysine 73 (K73) residue. Conversely, its mutant (K73R) was resistant to both acetylation and ubiquitination, exhibiting higher protein stability than that of wild-type CSE. Collectively, our findings suggested that HNK treatment protects CSE against HDAC6-mediated degradation and may constitute an alternative for preventing endothelial dysfunction and hypertensive disorders.