Mid-term clinical and sonographic outcomes of minimally invasive acromioclavicular joint reconstruction: mini-open versus arthroscopically assisted.

INTRODUCTION: The current literature describes various operative stabilization strategies which achieve good clinical outcomes after acute acromioclavicular joint (ACJ) dislocation. The aim of this study was to compare the mid-term clinical and sonographic treatment outcomes after minimally invasive mini-open and arthroscopic reconstruction. MATERIALS AND METHODS: We conducted a retrospective two-center study of patients with acute ACJ dislocation. Surgical treatment was performed using either a mini-open approach (MIOP) or an arthroscopic technique (AR). The primary outcome parameters of this study were the sonographically measured acromioclavicular (ACD) and coracoclavicular distances (CCD). Secondary outcome parameters included the Constant-Murley score (CS), range of motion (ROM), postoperative pain scale (VAS), return to daily routine, return to sports, complications, as well as operative revisions. RESULTS: After a mean follow-up of 29 months, 30 patients were included in this study with an average age of 41.3 ± 14.8 years (MIOP) and 41.2 ± 15.4 years (AR). The sonographic ACD (MIOP 9.11 mm vs. AR 8.93 mm, p = 0.41) and CCD (MIOP 25.08 mm vs. AR 24.36 mm, p = 0.29) distances showed no statistically significant differences. Furthermore, there was no statistically significant difference when compared to the contralateral side (p = 0.42). With both techniques, patients achieved excellent clinical outcome parameters without statistically significant differences in CS (MIOP 95 vs. AR 97, p = 0.11) and VAS (MIOP 1.76 vs. AR 1.14, p = 0.18). The return to daily activity and return to sport rates did not differ. There were neither complications nor revisions in both groups. CONCLUSION: Both minimally invasive techniques for acute ACJ stabilization achieved excellent clinical and sonographic outcomes without one technique being statistically superior to the other.

[Patient safety in differentiated (in-hospital) activation of the resuscitation room for severely injured patients]. / Patientensicherheit bei differenzierter (innerklinischer) Schockraumaktivierung für Schwerverletzte.

BACKGROUND AND OBJECTIVE: Providing trauma services demands high personnel resources and structural costs. The goal of this study was to show if the assignment of trauma patients to a defined A or B resuscitation room treatment as a modified management concept is safe and feasible. MATERIAL AND METHODS: Between May 2020 and January 2021, all resuscitation room trauma patients were included in this single center prospective observational study. All patients admitted to the resuscitation room underwent a classification according to the German S3 guidelines grade of recommendation GoR A and GoR B in polytrauma and the status of the ABCDE sequence to an A and B resuscitation room. The classification was performed by the senior consultant on call via telephone after consultation and discussion of clinical findings. RESULTS: All 135 resuscitation room patients were included in the study of whom 42 trauma patients were assigned to the A resuscitation room (A-SR) and 93 were assigned to the B resuscitation room (B-SR). The comparison of the two groups showed that patients in the A­SR group are more likely to be accompanied by a prehospital emergency physician (80.5%) than patients in the B­SR group (55.5%). Patients in the B­SR group showed a significantly higher Glasgow coma scale (GCS). Using the eFAST emergency ultrasound protocol, 2.4% of the A­SR and 4.3% of the B­SR patients had trauma-associated pathologies, 26% of the A­SR and only 3.2% of the B­SR patients had to be admitted to the ICU, 21.4% of the A­SR and 1% of the B­SR patients died within 30 days after trauma. The injury severity scores (ISS) of the A­SR patients were significantly higher than in the B­SR group (ISS 28.3 vs. 6.8). CONCLUSION: The study confirmed that the assignment by the emergency department consultant according to the German S3 guideline in combination with the ABCDE sequence into resuscitation room A or B treatment is feasible, does not compromise the quality of care and is efficient in the use of the personnel resources.

[Training in clinical acute and emergency medicine - Supraspeciality in Germany : A concept for nationwide implementation!] / Zusatz-Weiterbildung Klinische Akut- und Notfallmedizin in Deutschland : Ein Konzept vor der bundesweiten Einführung!

At the 121st German Physicians Conference 2018 in Erfurt a resolution to accept the full amendment of the (draft) further training regulations (MWBO) was adopted and the State Medical Councils were requested to include them in their respective areas of responsibility. Therefore, the nationwide implementation of the supraspeciality (ZWB) for clinical acute and emergency medicine has been officially finalized. After consultation with the German Medical Council (BÄK) concerning the format, both the new MWBO 2018 and now the content of the ZWB are available as of 15 November 2018.The Physicians Conference resolution and anchoring of the new ZWB clinical acute and emergency medicine in the MWBO were preceded by a process lasting approximately 10 years. The concept of the ZWB clinical acute and emergency medicine, which was scrutinized by the Standing Committee on "medical further training" and the board of the BÄK and presented for approval, was essentially developed by representatives of the German Interdisciplinary Association for Intensive Care and Emergency Medicine (DIVI) and the German Society for Interdisciplinary Emergency and Acute Medicine (DGINA) in consultation with the BÄK. A consensus was finally reached in September 2017 in cooperation with those German specialist societies with a high proportion of emergency patients.In addition to the title, definition, and minimum requirements for applying the ZWB, the content was processed according to the European curriculum for emergency medicine. The structural prerequisites have now been approved, the Standing Committee has configured the content, and the complete MWBO 2018 has been successfully presented, such that the ZWB clinical acute and emergency medicine is expected to be implemented in the individual Federal States within the next 1-2 years.This article describes the history and development of ZWB clinical acute and emergency medicine in Germany and outlines future perspectives.

Chondrogenic potential of IL-10 in mechanically injured cartilage and cellularized collagen ACI grafts.

OBJECTIVE: The application of adjunctive mediators in Autologous chondrocyte implantation (ACI) techniques might be useful for improving the dedifferentiated chondrocyte phenotype, to support neocartilage formation and inhibit post-traumatic cartilage destruction. In this study we examined if (a) interleukin 10 treatment can cause chondrogenic phenotype stabilization and matrix preservation in mechanically injured cartilage and if (b) IL-10 can promote chondrogenesis in a clinically applied collagen scaffold for ACI treatment. MATERIALS AND METHODS: For (a) bovine articular cartilage was harvested, subjected to an axial unconfined injury and treated with bovine IL-10 (1-10,000 pg/ng/ml). For (b) a post-operatively remaining ACI graft was treated with human IL-10. Expression levels of type I/II/X collagen, SOX9 and aggrecan were measured by qPCR (a,b). After 3 weeks cell death was analyzed (nuclear blebbing and TUNEL assay) and matrix composition was determined by GAG measurements and immunohistochemistry (aggrecan, type I/II collagen, hyaluronic acid). STATISTICS: One way ANOVA analysis with Bonferroni's correction. RESULTS: (a) IL-10 stabilized the chondrogenic phenotype after injurious compression and preserved matrix integrity. This was indicated by elevated expression of chondrogenic markers COL2A1, ACAN, SOX9, while COL1A1 and COL10A1 were reduced. An increased GAG content paralleled this and histological staining of type 2 collagen, aggrecan and toluidine blue were enhanced after 3 weeks. (b) IL-10 [100 pg/ml] improved the chondrogenic differentiation of human chondrocytes, which was accompanied by cartilaginous matrix formation after 3 weeks of incubation. CONCLUSION: Interleukin-10 is a versatile adjuvant candidate to control the post-injurious environment in cartilage defects and promote chondrogenesis in ACI grafts.

IL-10 ameliorates TNF-α induced meniscus degeneration in mature meniscal tissue in vitro.

BACKGROUND: Joint inflammation causes meniscus degeneration and can exacerbate post-traumatic meniscus injuries by extracellular matrix degradation, cellular de-differentiation and cell death. The aim of this study was to examine whether anti-inflammatory interleukin-10 exerts protective effects in an in vitro model of TNF-α-induced meniscus degeneration. METHODS: Meniscus tissue was harvested from the knees of adult cows. After 24 h of equilibrium explants were simultaneously treated with bovine TNF-α and IL-10. After an incubation time of 72 h cell death was measured histomorphometrically (nuclear blebbing, NB) and release of glycosaminoglycans (GAG, DMMB assay) and nitric oxide (NO, Griess-reagent) were analysed. Transcription levels (mRNA) of matrix degrading enzymes, collagen type X (COL10A1) and nitric oxide synthetase 2 (NOS2) were measured by quantitative real time PCR. TNF-α-dependent formation of the aggrecanase-specific aggrecan neoepitope NITEGE was visualised by immunostaining. Differences between groups were calculated using a one-way ANOVA with a Bonferroni post hoc test. RESULTS: Administration of IL-10 significantly prevented the TNF-α-related cell death (P .001), release of NO (P .003) and NOS2 expression (P .04). Release of GAG fragments (P .001), NITEGE formation and expression of MMP3 (P .007), -13 (P .02) and ADAMTS4 (P .001) were significantly reduced. The TNF-α-dependent increase in COL10A1 expression was also antagonized by IL-10 (P .02). CONCLUSION: IL-10 prevented crucial mechanisms of meniscal degeneration induced by a key cytokine of OA, TNF-α. Administration of IL-10 might improve the biological regeneration and provide a treatment approach in degenerative meniscus injuries and in conditions of post-traumatic sports injuries.

[Injuries of major tendons : Review of current diagnostic and surgical standards]. / Verletzung großer Sehnen : Übersicht über die Diagnostik und Therapie der Sehnenverletzungen.

Chronic degenerative tendon injuries as well as injuries due to acute high-energy trauma and incisional injuries are a significant aspect in the emergency surgery department. As a result of anatomical characteristics and exposure certain tendons are particularly vulnerable to injury. These include the biceps brachialis, quadriceps femoris, patella, achilles and tibialis anterior tendons. Besides the broad spectrum of non-surgical treatment, surgeons should have knowledge of the various surgical techniques including suturing, anchor refixation and reconstruction techniques. The indications for surgery are of particular importance for the clinical outcome of tendon injuries. The therapeutic approach should consider the patients biological age, functional requirements and pre-existing comorbid pathologies. Finally, adequate aftercare has been shown to significantly determine the surgical outcome.

[Fixed angle carbon fiber reinforced polymer composite plate for treatment of distal radius fractures : Pilot study on clinical applications]. / Winkelstabile karbonverstärkte Polymerkompositplatte zur Versorgung einer distalen Radiusfraktur : Pilotstudie zur klinischen Anwendung.

BACKGROUND: The clinical implementation of a new carbon-fiber-reinforced polyetheretherketon (PEEK) plate for distal radius fractures might offer advantageous properties over the conventional metallic devices. This includes similar elastic modulus to cortical bone, radiolucency, low artifacts on MRI scans and the lack of metal allergies. OBJECTIVE: The aim of this study was to evaluate the clinical results at 6-week and 12-month follow-up using either a new fixed angle (monoaxial) PEEK plate system or a fixed angle (polyaxial) titanium plate. METHODES: We included 26 patients (mean age 59.3) with displaced fractures of the distal radius (all AO types). Radiological and functional outcomes were measured prospectively at a 6-week and 12 month follow-up. RESULTS: We documented no cases of hardware breakage or significant loss of the surgically achieved fracture reduction with the usage oft the new PEEK device. Operating time was 101.0 min using PEEK versus 109.3 min in titanium plates, recorded times were including preparation, draping, and postoperative processing (ns, p 0.156). At the 6-week follow up the PEEK plate showed a trend for better range of motion and functional results (DASH-score, Mayo-wrist score, VAS) with no statistical significance. Results of 12 month follow up with PEEK showed comparable results with corresponding studies examining titanium plate after this period. CONCLUSION: First experience with PEEK plate osteosynthesis demonstrate quick clinical implementation with good clinical outcome and the advantage of excellent postoperative radiological assessment. At early follow-up PEEK even showed a trend for improved functional results.

[Femoral neck fractures in young patients]. / Schenkelhalsfraktur des jungen Patienten.

Femoral neck fractures in young patients are rare but of high clinical relevance due to the complexity of risk factors and complications. Early stabilization and accurate reduction are of high priority. Femoral head-preserving stabilization by dynamic hip screws or threefold screw osteosynthesis are the methods of choice. Postoperative results should be closely controlled in every case in order to be able to treat possible complications in time.

Comparison of intraoperative flat panel imaging and postoperative plain radiography for the detection of intraarticular screw displacement in volar distal radius plate ostheosynthesis.

OBJECTIVES: To investigate if intraoperative 3D flat panel imaging improves the detection of radiocarpal intraarticular screw misplacement (RCSM) in comparison to standard postoperative x-ray. METHODS: In a study on cadaver specimens, we evaluated the sensitivity and specificity to detect RCSM using X-ray, intraoperative 3D-fluoroscopy as well as the digital volume tomography. The gold standard reference was computed tomography. RESULTS: Sensitivity for the detection of RCSM for X-ray was 58% and specificity 88%. For DVT, the sensitivity to detect RCSM was 88% and the specificity 53%. For 3D-fluoroscopy, the sensitivity for RCSM was 68% and specificity 95%. When combining the methods, the best performance was found, when combining the two intraoperative imaging methods, with a resulting sensitivity of 88% and a specificity of 73%. CONCLUSIONS: Intraoperative 3D fluoroscopy and digital volume tomography appear to be at least as sensitive and specific to detect RCSM than the regular postoperative radiography in two planes. However, especially discrete screw misplacements can be missed with either method. LEVEL OF EVIDENCE: Level IV. Diagnostic device study.

Intragastric pH and pressure profiles after intake of the high-caloric, high-fat meal as used for food effect studies.

The intraluminal conditions of the fed stomach are critical for drug release from solid oral dosage forms and thus, often associated with the occurrence of food effects on oral bioavailability. In this study, intragastric pH and pressure profiles present after the ingestion of the high-caloric, high-fat (964 kcal) FDA standard breakfast were investigated in 19 healthy human subjects by using the telemetric SmartPill® capsule system (26 × 13 mm). Since the gastric emptying of such large non-digestible objects is typically accomplished by the migrating motor complex phase III activity, the time required for recurrence of fasted state motility determined the gastric emptying time (GET). Following the diet recommendations of the FDA guidance on food effect studies, the mean GET of the telemetric motility capsule was 15.3 ± 4.7 h. Thus, the high caloric value of the standard breakfast impeded gastric emptying before lunch in 18 out of 19 subjects. During its gastric transit, the capsule was exposed to highly dynamic conditions in terms of pH and pressure, which were mainly dependent on further meal and liquid intake, as well as the intragastric capsule deposition behavior. Maximum pH values in the stomach were measured immediately after capsule intake. The median pH value of the 5 min period after capsule ingestion ranged between pH 3.3 and 5.3. Subsequently, the pH decreased relatively constantly and reached minimum values of pH 0-1 after approximately 4 h. The maximum pressure within the stomach amounted to 293 ± 109 mbar and was clearly higher than the maximum pressure measured at the ileocaecal junction (60 ± 35 mbar). The physiological data on the intraluminal conditions within the fed stomach generated in this study will hopefully contribute to a better understanding of food effects on oral drug product performance.

[Position paper for a reform of medical emergency care in German emergency departments]. / Positionspapier für eine Reform der medizinischen Notfallversorgung in deutschen Notaufnahmen.

The hospital emergency departments play a central role for the in- and outpatient care of patients with medical emergencies in Germany. In this position paper we point out some general financial and organizational problems of German emergency departments and urge for a higher significance of emergency care in the German health system as an element of public services. The corresponding reform proposals include a change in hospital financing towards a more budget-based system for the emergency departments, an improved structural planning for regional and transregional emergency care, an intensified cooperation with the emergency services of the ambulatory care physicians, a better organizational representation of emergency care within the hospitals and an advancement of emergency medicine in postgraduate medical education.

[Toxic shock syndrome after open ankle fracture]. / Toxic-shock-Syndrom nach offener Sprunggelenkverletzung.

The treatment of open fractures is a challenge for the attending surgeon. Depending on the severity, the risk of infection rises up to 50%. Local infection up to the point of sepsis can develop in spite of surgical and antimicrobial therapy. The present case demonstrates the case of an 18-year-old man who developed toxic shock syndrome (TSS) after an open ankle fracture. This potentially life-threating syndrome usually presents with the main symptoms of fever, hypotension and exanthema and is caused by toxins, such as toxic shock syndrome toxin 1 (TSST-1) and staphylococcal enterotoxins A-D. In some cases it is associated with cardiopulmonary decompensation and can rapidly progress to multiorgan failure.

Early endothelial progenitor cells as a source of myeloid cells to improve the pre-vascularisation of bone constructs.

According to present knowledge, blood derived endothelial progenitor cells (EPC) might act as proangiogenic myeloid cells, which play a fundamental role in the regulation of angiogenesis and blood vessel reorganisation. In this context, we have evaluated the contribution of endogenous myeloid cells in co-cultures of blood derived outgrowth endothelial cells (OEC) and osteogenic cells. In addition, we investigated the role of EPC as a potential source of myeloid cells in the formation of vascular structures in an in vitro model consisting of mesenchymal stem cells (MSC) and OEC. For this purpose, we added EPCs to co-cultures of MSC and OECs. Vascular structures and the co-localisation of myeloid cells were analysed by confocal laser microscopy (CLSM) for endothelial and myeloid markers and quantitative image analysis. The molecular effects of myeloid cells were evaluated by quantitative real time PCR, ELISA and protein arrays from cell culture supernatants and lysates. Endogenous myeloid cells were significantly co-localised with angiogenic structures in co-cultures of OEC and osteogenic cells. The active addition of EPC to co-cultures of OEC and MSC resulted in a statistically approved increase in the formation of prevascular structures at early stages of the co-culture process. In addition, we observed an increase of endothelial markers, indicating beneficial effects of EPC or myeloid cells on endothelial cell growth. Furthermore, real time PCR indicated high expression levels of CD68, CD11b and CD163 in co-cultures of EPC and MSC indicating that EPC act at least partly as macrophage like-cells.

[Operative treatment strategies for multiple trauma patients : early total care versus damage control]. / Operative Versorgungsstrategien von Polytraumapatienten : "Early total care" vs. "damage control"

The treatment of multiple trauma patients is a great challenge for an interdisciplinary team. After preclinical care and subsequent treatment in the emergency room the order of the interventions is prioritized depending of the individual risk stratification. For planning the surgery management it is essential to distinguish between absolutely essential operations to prevent life-threatening situations for the patient and interventions with shiftable indications, depending on the general condition of the patient. All interventions need to be done without causing significant secondary damage to prohibit hyperinflammation and systemic inflammatory response syndrome. The challenge consists in determination of the appropriate treatment at the right point in time. In general the early primary intervention, early total care, is differentiated from the damage control concept.

[Knee joint infections]. / Das infizierte Kniegelenk.

Knee joint infection represents an emergency case at every age. Joint infection occurs frequently after trauma or joint surgery. The infection can be caused by numerous bacteria, viruses, or yeasts; however, Staphylococcus aureus is identified as the cause in 85-95 % of joint infections. Early treatment is important for patient outcome. In addition to synovectomy and therapeutic arthroscopy, antibiotic therapy is essential and should be started after sample recovery.

Platelet-released growth factors can accelerate tenocyte proliferation and activate the anti-oxidant response element.

Little is know about the pathophysiology of acute and degenerative tendon injuries. Although most lesions are uncomplicated, treatment is long and unsatisfactory in a considerable number of cases. Besides the common growth factors that were shown to be relevant for tendon integrity more recently protection against oxidative stress was shown to promote tendon healing. To improve tendon regeneration, many have advocated the use of platelet-rich plasma (PRP), a thrombocyte concentrate that can serve as an autologous source of growth factors. In this study, we investigated the effect of platelet-released growth factors (PRGF) on tenocytes. Tenocytes were isolated from the Achilles tendon of postnatal rats. Tenocyte cell cultures were stimulated with PRGF. We used a CyQuant assay and WST assay to analyse tendon cell growth and viability in different concentrations of PRGF. Migration and proliferation of cells grown in PRGF were assessed by a scratch test. A dual-luciferase assay was used to demonstrate the activation of the anti-oxidant response element (ARE) in tenocytes. A positive effect of PRGF could be shown on tendon cell growth and migratory capacity. PRGF activated the Nrf2-ARE pathway in a dose-dependent manner. Here, we provide evidence of a biological effect of PRGF on tenocytes by the promotion of tenocyte growth and activation of the Nrf2-ARE pathway. This is a novel aspect of the action of platelet concentrates on tendon growth.

[Patella dislocation]. / Patellaluxation.

The patella dislocation is defined as a non-recurring or recurrent dislocation of the patella from the patella surface of the femur. In general the patella dislocates in the lateral direction. Patella dislocations are subdivided in congenital, habitual or traumatic dislocations. Furthermore patella dislocations are differentiated in recurrent and chronic dislocations. Etiology of patella dislocations is not consistent and can be due to genu valgum, patella dysplasia or patella alta etc. Frequently the patella reposes spontaneously after dislocation. Besides examination of the knee, x-ray and magnetic resonance tomography belong to clinical diagnostics of the knee joint. Decision between conservative and operative therapy is addicted to accompanying injuries like fractures or ligamental injuries.

[Mass sports improves proprioception and reduces valgus stress on the female knee joint]. / Breitensport verbessert die Propriozeption und beugt Valgusstress im Kniegelenk der Frau vor.

AIM: ACL rupture is more common in females than in males. The injury can result in chondral and meniscal damage or chronic instability. Most often ACL rupture occurs during landing after throwing and jumping in ball sports. Many studies have reported on incidence, mechanism of injury and predisposing factors in professional athletes. In contrast, we have investigated the impact of mass sports on predisposing factors for the female ACL rupture. METHOD: In an empirical analytical study leg-axis dynamics, proprioception and foot load of 44 women participating either in regular mass sports or in no sports were investigated by video analysis and on the Biodex-Stability Platform. RESULTS: Our study demonstrates that mass sports improves proprioception of the knee joint. Non-sportive subjects had an increased valgus leg axis during landing in comparison with mass sport participants. CONCLUSION: Here, we show to the best of our knowledge for the first time that moderate sports activity has a positive effect on predisposing factors of the female ACL rupture. We conclude that prevention programmes focussed on jumping and proprioception can lower the incidence of female ACL ruptures.

Femur ultrasound (FemUS)--first clinical results on hip fracture discrimination and estimation of femoral BMD.

SUMMARY: A quantitative ultrasound (QUS) device for measurements at the proximal femur was developed and tested in vivo (Femur Ultrasound Scanner, FemUS). Hip fracture discrimination was as good as for DXA, and a high correlation with hip BMD was achieved. Our results show promise for enhanced QUS-based assessment of osteoporosis. INTRODUCTION: Dual X-ray absorptiometry (DXA) at the femur is the best predictor of hip fractures, better than DXA measurements at other sites. Calcaneal quantitative ultrasound (QUS) can be used to estimate the general osteoporotic fracture risk, but no femoral QUS measurement has been introduced yet. We developed a QUS scanner for measurements at the femur (Femur Ultrasound Scanner, FemUS) and tested its in vivo performance. METHODS: Using the FemUS device, we obtained femoral QUS and DXA on 32 women with recent hip fractures and 30 controls. Fracture discrimination and the correlation with femur bone mineral density (BMD) were assessed. RESULTS: Hip fracture discrimination using the FemUS device was at least as good as with hip DXA and calcaneal QUS. Significant correlations with total hip bone mineral density were found with a correlation coefficient R (2) up to 0.72 and a residual error of about one half of a T-score in BMD. CONCLUSIONS: QUS measurements at the proximal femur are feasible and show a good performance for hip fracture discrimination. Given the promising results, this laboratory prototype should be reengineered to a clinical applicable instrument. Our results show promise for further enhancement of QUS-based assessment of osteoporosis.