The Compact Linear Collider (CLIC) - 2018 Summary Report

The Compact Linear Collider (CLIC) is a TeV-scale high-luminosity linear $e^+e^-$ collider under development at CERN. Following the CLIC conceptual design published in 2012, this report provides an overview of the CLIC project, its current status, and future developments. It presents the CLIC physics potential and reports on design, technology, and implementation aspects of the accelerator and the detector. CLIC is foreseen to be built and operated in stages, at centre-of-mass energies of 380 GeV, 1.5 TeV and 3 TeV, respectively. CLIC uses a two-beam acceleration scheme, in which 12 GHz accelerating structures are powered via a high-current drive beam. For the first stage, an alternative with X-band klystron powering is also considered. CLIC accelerator optimisation, technical developments and system tests have resulted in an increased energy efficiency (power around 170 MW) for the 380 GeV stage, together with a reduced cost estimate at the level of 6 billion CHF. The detector concept has been refined using improved software tools. Significant progress has been made on detector technology developments for the tracking and calorimetry systems. A wide range of CLIC physics studies has been conducted, both through full detector simulations and parametric studies, together providing a broad overview of the CLIC physics potential. Each of the three energy stages adds cornerstones of the full CLIC physics programme, such as Higgs width and couplings, top-quark properties, Higgs self-coupling, direct searches, and many precision electroweak measurements. The interpretation of the combined results gives crucial and accurate insight into new physics, largely complementary to LHC and HL-LHC. The construction of the first CLIC energy stage could start by 2026. First beams would be available by 2035, marking the beginning of a broad CLIC physics programme spanning 25-30 years

False profile radiography for the evaluation of Legg-Celvé-Perthes disease

False profile radiography (FPR), as proposed by Lequesne and de Sèze, depicts the pathology on the anterolateral acetabular wall and femoral head. A study was conducted to find out the differences between normal anteroposterior radiography and FPR. Twenty-seven patients with Legg-Calvé-Perthes disease who had not been operated on previously and 50 recruits without any pathology were studied for the acetabulum-head index of Heyman-Herndon (HHI) and center-edge angles (CEs) in anteroposterior radiographs and VCA angles in FPR. The VCA angle is most useful to detect anterolateral coverage of the femoral head in lateral pillar C hips. FPR is an easy, reliable and cheap technique to evaluate the anterolateral parts of the femoral head, and the acetabulum. © 2004 Lippincott Williams & Wilkins

Ponseti technique for the correction of idiopathic clubfeet presenting up to 1 year of age. A preliminary study in children with untreated or complex deformities

Introduction: The aim of this study is to evaluate the effectiveness of the Ponseti method in children presenting before 1 year of age with either untreated or complex (initially treated unsuccessfully by other conservative methods) idiopathic clubfeet. Patients and methods: The authors report 134 feet of 92 patients with Dimeglio grade 2, 3, or 4 deformities treated with the Ponseti method. Twenty-four percent of feet were of complex deformities at initial presentation to the authors' clinics. Results: At a mean follow-up of 46 months (range 24-89) we avoided joint release surgery in 97% of feet. Sixty-seven percent required a percutaneous tenotomy of the Achilles tendon. Relapse rate was 31% (41 feet). We treated 2 relapses by restarting the use of orthosis, 17 with re-casting, 18 with anterior tibial tendon transfer following a second relapse, and 4 feet with extensive joint surgery. Compliance with the use of orthosis was identified as the most important risk factor (P < 0.0001) for relapses. Previous unsuccessful treatment attempts by other conservative methods did not adversely affect the results unless the cases had iatrogenic deformities. Cases with iatrogenic deformities from previous treatment had a significantly increased risk of non-compliance and relapse. Experience of the treating surgeon and cast complications were also related to relapses. Conclusion: Our results show that the Ponseti technique is reproducible and effective in children at least up to 12 months of age. It can also produce good correction in children presenting with complex idiopathic deformities. Therefore, extensive joint releases should not be considered immediately in such cases. The treating surgeon should be meticulous in using the technique and ensure compliance to foot abduction brace in order to avoid recurrences