The Geometric Osteotomy: Joint Preservation in Juxta-Articular Surface Bone Neoplasms

Purpose. To present the oncologic and functional results of a consecutive series of patients treated by geometric osteotomy and allograft reconstruction for juxta-articular surface bone neoplasms

A small satellite version of a soft x-ray polarimeter

We describe a new implementation of a broad-band soft X-ray polarimeter, substantially based on a previous design. This implementation, the Pioneer Soft X-ray Polarimeter (PiSoX) is a SmallSat, designed for NASA’s call for Astrophysics Pioneers, small missions that could be CubeSats, balloon experiments, or SmallSats. As in REDSoX, the grating arrangement is designed optimally for the purpose of polarimetry with broad-band focussing optics by matching the dispersion of the spectrometer channels to laterally graded multilayers (LGMLs). The system can achieve polarization modulation factors over 90%. For PiSoX, the optics are lightweight Si mirrors in a one-bounce parabolic configuration. High efficiency, blazed gratings from opposite sectors are oriented to disperse to a LGML forming a channel covering the wavelength range from 35 Å to 75 Å (165 - 350 eV). Upon satellite rotation, the intensities of the dispersed spectra, after reflection and polarizing by the LGMLs, give the three Stokes parameters needed to determine a source’s linear polarization fraction and orientation. The design can be extended to higher energies as LGMLs are developed further. We describe examples of the potential scientific return from instruments based on this design

Longitudinal Assessment of Growth in Hypoplastic Left Heart Syndrome: Results From the Single Ventricle Reconstruction Trial

Background: We sought to characterize growth between birth and age 3 years in infants with hypoplastic left heart syndrome who underwent the Norwood procedure. Methods and Results: We performed a secondary analysis using the Single Ventricle Reconstruction Trial database after excluding patients 2 SD below normal). Failure to find consistent risk factors supports the strategy of tailoring nutritional therapies to patient‐ and stage‐specific targets. Clinical Trial Registration URL: http://clinicaltrials.gov/. Unique identifier: NCT00115934

The Geometric Osteotomy: Joint Preservation in Juxta-Articular Surface Bone Neoplasms

Purpose. To present the oncologic and functional results of a consecutive series of patients treated by geometricosteotomy and allograft reconstruction for juxta-articular surface bone neoplasms.Patients. Twelve consecutive patients (mean age 28 years) underwent excision of benign aggressive or malignantjuxta-articular surface bone neoplasms. In each case, only part of the circumference of the bone was excised, and the jointsurface was preserved and kept in continuity with the remainder of the bone. The defects were filled with allograft orautograff, and internally fixed as appropriate.Methods. Patients were eligible for the study if they had a histologically proven, primary tumour of bone adjacent to ajoint such that the turnout could be completely excised with a partial cortical resection and preservation of the joint. Thedatabase at the University Musculoskeletal Oncology Unit was used to identify all cases. Patient demographics andoncologic results were recorded. Functional assessment was performed using the Musculoskeletal Tumor Society ratingscale and the Toronto Extremity Salvage Score.Results. Nine tumours were about the knee and three were in the proximal humerus. Negative margins were achieved inall cases. No patient had metastatic disease at a mean follow-up of 56.5 months. There was one local recurrence and thiswas managed by conversion to a Van Nes rotationplasty. Functional results were excellent in the proximal humeral casesand in cases about the knee where the stabilizing ligaments were preserved. Cases with post-operative knee instability wereless successful but none the less were well controlled with bracing.Discussion. This technique offers an alternative to joint excision and prosthetic replacement ina group of young patients.Peer Reviewe

Perceived Exertion during Exercise Is Associated with Childrenʼs Energy Intake

International audienc

A small satellite version of a soft x-ray polarimeter

© 2020 SPIE We describe a new implementation of a broad-band soft X-ray polarimeter, substantially based on a previous design. This implementation, the Pioneer Soft X-ray Polarimeter (PiSoX) is a SmallSat, designed for NASA's call for Astrophysics Pioneers, small missions that could be CubeSats, balloon experiments, or SmallSats. As in REDSoX, the grating arrangement is designed optimally for the purpose of polarimetry with broad-band focussing optics by matching the dispersion of the spectrometer channels to laterally graded multilayers (LGMLs). The system can achieve polarization modulation factors over 90%. For PiSoX, the optics are lightweight Si mirrors in a one-bounce parabolic configuration. High efficiency, blazed gratings from opposite sectors are oriented to disperse to a LGML forming a channel covering the wavelength range from 35 Å to 75 Å (165 - 350 eV). Upon satellite rotation, the intensities of the dispersed spectra, after reflection and polarizing by the LGMLs, give the three Stokes parameters needed to determine a source's linear polarization fraction and orientation. The design can be extended to higher energies as LGMLs are developed further. We describe examples of the potential scientific return from instruments based on this design