Impact dynamics of tool steel penetrators

Armor-piercing (AP) ammunition generally carries a hard penetrator within a copper jacket. Upon impact on a hard target, the copper case is destroyed, but the penetrator continues its motion and pierces the target. The most efficient AP ammunition is built with penetrators made from either tungsten alloys or depleted uranium, but alloy steel penetrators are also commonly used, because they are less expensive and less polluting, even if they are much less efficient. The impact deformation and fracture behavior of armor-piercing penetrators fabricated with three tool steels, and their resultant ballistic efficiency, are investigated, both to better understand the optimal mechanical properties of armor piercing materials, and to describe the fracture mechanics of the tested materials. Moreover, the ballistic results of the three tool steels are compared with those of plain medium-carbon steel and cemented tungsten carbide

Silicone gauzes with α-tocopherol acetate oil in skin graft donor site dressing

Split-thickness skin graft is one of the most used procedures in plastic surgery. This procedure involves numerous painful dressings at the donor site. α-Tocopherol acetate has anti-oxidative and anti-inflammatory properties and it can reduce the local bacterial growth, thereby promoting wound healing. We designed a prospective study to evaluate the effects of two different kinds of dressings at skin graft donor sites. A total of 30 patients were subjected to daily dressings with α-tocopherol acetate oil and traditional moist gauzes (group 1). Another 30 patients were subjected to dressings every 4 days with α-tocopherol acetate oil and silicone–vitamin E gauzes (group 2). Healing time, infection rate, patient's pain perception and costs were evaluated in both the groups. No statistically significant difference was found in terms of healing time. The infection rate was slightly different in the two groups. Significant reduction of pain perception was detected in group 2. In the same group, significant reduction in the total cost of the treatment was also observed. α-Tocopherol acetate oil and silicone–vitamin E gauzes may represent a safe, simple, painless and inexpensive method for improving skin graft donor site healing

Esiste un'alternativa alla matrice dermica acellulare per la gestione delle ferite? Rivisitazione del ruolo di una medicazione bioattiva a base di collagene e acido ialuronico

La guarigione delle ferite è un processo complesso che coinvolge molte interazioni sinergiche tra diverse linee cellulari, citochine, enzimi e fattori di crescita. Negli ultimi anni sono stati introdotti diversi biomateriali e medicazioni bioattive che si ritiene svolgano un ruolo attivo nella guarigione delle ferite. Sia il collagene che l'Acido Ialuronico (AI) sono stati ampiamente adottati per la gestione delle ferite e la sua combinazione, utilizzata come medicazione bioattiva, è stata studiata. Abbiamo riportato la nostra esperienza clinica con una medicazione avanzata composta da AI più collagene eterologo di tipo I applicato su ferite acute e croniche di diversa eziologia in una coorte retrospettiva di 30 pazienti. Tutti i pazienti inclusi avevano ferite cutanee portate a guarigione completa per seconda intenzione, e tutte le ferite sono state trattate utilizzando Bionect Pad® (BP). Se necessario, alcuni casi sono stati gestiti con trattamenti combinati al fine di ottenere un'adeguata preparazione del letto della ferita prima dell'applicazione di BP. Trenta pazienti con età media di 60,2 anni sono stati trattati per ferite di diversa eziologia. La tipologia di ferite trattate includeva ulcere venose, ferite post-traumatiche, complicanze di ferite chirurgiche, lesioni da decubito, ustioni, ulcerazioni peristomali e ulcerazioni cutanee dopo radioterapia. Il tempo medio di guarigione è stato di 31 giorni (range: 21-76 giorni). Sulla base dei nostri risultati incoraggianti, riteniamo che tali medicazioni bioattive possano essere considerate un'alternativa utile e affidabile ad altri metodi di trattamento ben noti e consolidati, come le matrici dermiche acellulari o altre medicazioni avanzate, in casi selezionati

All-suture anchors in arthroscopic acetabular labral repair: our experience

BACKGROUND: Over the past years, the role of the acetabular labrum in hip joint biomechanics and its relations with joint health has been of particular interest. There is a good clinical improvement of patients in whom the acetabular labrum is preserved during arthroscopic hip surgery. The purpose of this study is to report the results of arthroscopic repair of labral tears at a medium term follow up. MATERIALS AND METHODS: We performed a retrospective review of all cases that underwent hip arthroscopy at our Institution from January 2013 until December 2018. There were 24 patients, 13 males and 11 females, and their mean age at the time of surgery was 29, 42 years (range, 19 to 43 years). All patients were treated by the same surgeon with an extracapsular OUT-IN approach. Suture was performed using a non-absorbable suture anchor all-suture. Clinical assessment was performed at December 2019 using a modified Harris hip score (mHHS), hip outcomes score activities of daily living (HOS ADL), hip outcomes score activities of sport scale (HOS SS). All patients with acetabular labrum injury had femoro-acetabular impingement. RESULTS: The mean overall values in the preoperative period were 67.21 \ub1 10.31 for mHHS, 70.04 \ub1 12.11 for HOS-ADL and 60.06 \ub1 14.58 for HOS -SS. The results obtained in the re-evaluations of patients in December 2019 with a mean follow-up of 38, 3 months (minimum 1 year) are on average 82.17 \ub1 11.36 for mHHS, 83.00 \ub1 12.80 for HOS-ADL and 76.09 \ub1 18.52 for HOS-SS. CONCLUSIONS: The progress of knowledge and the advancement of diagnostic and therapeutic skills has led to a greater awareness of the importance of treating acetabular labrum tears. Arthroscopic treatment with suture appear to be a good option for these patients and we had encouraging results in our center

Role of MRI Features as a Prognostic Index in Cervical Spondilogenetic Myelopathy

Introduction The importance of a correct preoperative radiological diagnosis in patients with cervical myelopathy has been widely demonstrated. Indeed, few studies still exist about the correlation between postoperative radiographic and clinical modifications. Materials and Methods The authors present a prospective study of 54 patients with cervical spondilogenetic myelopathy, who underwent surgery for corpectomy and anterior fusion with mesh in a period between January 2005 and August 2013. Images of cervical RMN were studied pre-and postoperatively and attention has been focused on alterations of intramedullary signal on T1- and T2-weighted sequences. Pre-and postoperative changes were correlated with clinical data (obtained by means of a Nurick scales and JOA classification—modified by Benzel). In relation to cervical RM-based studies, patients were divided into 3 groups: (A) no intramedullary signal alteration; (B) alterations in T2-weighted sequences; (C) alterations of the signal in both T1- and T2-weighted sequences. Results In all patients, decompression of the cervical spinal cord has been demonstrated by extension of the anteroposterior diameter of the spinal canal and by increase in the thickness of the subarachnoid space. In group A patients, no intramedullary signal changes were highlighted postoperatively. Patients in group B showed improvement on the base of hyperintensity disappearance on T2-weighted MRI, correlating with an improvement in the clinical quadro. Patients of group C have not been showing changes in the intramedullary MRI signal despite spinal cord decompression. Conclusions Signal alterations in T1 are an unfavorable prognostic index and proved to be irreversible. They correlate with a lack of clinical improvement of the patient. Patients in group B are those with the greatest clinical benefit after surgery and in whom clinical improvement correlates clearly with the radiological outcome

The Evolving Role of Local Treatments for HCC in the Third Millennium

Hepatocellular carcinoma (HCC) represents the fifth most common malignancy and the third cancer-related cause of death worldwide. The aim of this review was to clarify the role of local treatments for HCC, analyzing the indications and defining future perspectives