Enhancing rotational placement of reconstruction prostheses of the distal femur after sarcoma resection

Introduction: Currently there are no accepted international guidelines for the correct placement of reconstruction prostheses in the axial plane of the femur after en bloc resection. The most accepted method is based on the linea aspera as an intraoperative landmark, indicating posterior. This study was conducted to address the reliability of the linea aspera as a landmark for rotational alignment. Material and methods: 50 CT angiographies of the right limb were used for this purpose. These 2D images were reconstructed into 3D models using proprietary software (materialize NV, Leuven, Belgium). The posterior condylar line was used as a reference axis. The orientation of the linea aspera was described as the angle between the perpendicular line to the PCL, through the center of the diaphysis, and the lateral (a) and medial labium (beta). Results: The linear mixed model shows that the alpha- and beta-angles are significantly associated with the distance from the joint line (p<0.001) and vary significantly between subjects (p<0.001). The alpha-angle has the lowest variance and approximates more closely true posterior, while the median beta-angle never overlaps true posterior. Discussion: When a surgeon would blindly rely on the linea aspera as a posterior landmark roughly 78% of the femoral implants would exceed the accepted +/- 3 degrees deviation around the surgical transepicondylar axis (sTEA) as defined in total knee replacement. The linea aspera is not a reliable landmark for axial rotation of femoral implants. The position is highly dependent on the osteotomy height and in addition differs between individual patients. Preoperative assessment of the linea aspera is advocated in order to reduce the risk of malrotation. As the height of the osteotomy cannot always be determined correctly preoperatively, a table was designed as a guideline for how much a deviation from the planned resection height will affect the rotation of the implant. (c) 2020 IPEM. Published by Elsevier Ltd. All rights reserved

Ten-year outcomes of the Arpe prosthesis for the treatment of osteoarthritis of the trapeziometacarpal joint

Outcomes of 66 Arpe prostheses in 50 patients treated for osteoarthritis of the trapeziometacarpal joint were investigated with a mean follow-up of ten years. Ten-year survival was 87% when failure was defined as implant removal followed by trapeziectomy and tendon interposition. Ten-year survival was 82% when revision of the cup was also considered as failure and it was 80% when replacement of the neck alone was also chosen as an endpoint. Of the 52 prostheses that were not revised mean DASH score was 11, mean pain score 1.2 and mean score for satisfaction 9.5 It can be concluded that the majority of patients who did not underwent revision surgery were satisfied and had little or no pain. However, long-term survival of the Arpe prosthesis was moderate and patients should be warned that after ten years the risk for reoperation might be up to 20%.

Ten-year outcomes of the Arpe prosthesis for the treatment of osteoarthritis of the trapeziometacarpal joint

Outcomes of 66 Arpe prostheses in 50 patients treated for osteoarthritis of the trapeziometacarpal joint were investigated with a mean follow-up of ten years. Ten-year survival was 87% when failure was defined as implant removal followed by trapeziectomy and tendon interposition. Ten-year survival was 82% when revision of the cup was also considered as failure and it was 80% when replacement of the neck alone was also chosen as an endpoint. Of the 52 prostheses that were not revised mean DASH score was 11, mean pain score 1.2 and mean score for satisfaction 9.5. It can be concluded that the majority of patients who did not underwent revision surgery were satisfied and had little or no pain. However, long-term survival of the Arpe prosthesis was moderate and patients should be warned that after ten years the risk for reoperation might be up to 20%

Effects of supercharging, EGR and variable valve timing on power and emissions of hydrogen internal combustion engines

A

The terrestrial invertebrate fauna of Edgeøya, Svalbard: Arctic landscape community composition reflects biogeography patterns

Colonisation and immigration history is often neglected as a factor when investigating community or species distribution patterns. However, for dynamic systems that are still reacting to large-scale environmental change, such as the retreat of the ice since the last glacial maximum, colonisation history may explain a large amount of the variation between geographically distinct communities. The High Arctic archipelago of Svalbard presents an opportunity to test whether it is possible to observe the effects of large-scale biogeographical patterns on species distribution at landscape scales. Svalbard has one of the best described inventories of the invertebrate fauna in the Arctic. Nonetheless, the majority of the species records originate from the more accessible west coast and the invertebrate fauna of the whole eastern region, including Edgeøya, is virtually unknown. Edgeøya is located at the eastern fringe of the archipelago on the boundary between Palaearctic and Nearctic faunas. It was expected that post-colonisation dispersal within Edgeøya would conceal routes to the archipelago. Samples were obtained from six locations along the coast of Edgeøya between 2009 and 2010. 140 invertebrate species were identified belonging to 69 different genera of which 16 are new records for Svalbard. Most new species present an eastern Palaearctic distribution. Habitat variables (percentage cover of moss, lichen, vascular plant, or bare soil) fail to explain 35.5% of the differences among sites. However, cluster analysis reveals a clear east–west distribution pattern across the island suggesting that pan-Arctic dispersal routes can be identified even at relatively short geographical scales

rdfjs/N3.js: v1.17.2

&lt;h2&gt;&lt;a href="https://github.com/rdfjs/N3.js/compare/v1.17.1...v1.17.2"&gt;1.17.2&lt;/a&gt; (2023-10-27)&lt;/h2&gt; &lt;h3&gt;Bug Fixes&lt;/h3&gt; &lt;ul&gt; &lt;li&gt;support indexing of quoted triples (&lt;a href="https://github.com/rdfjs/N3.js/issues/369"&gt;#369&lt;/a&gt;) (&lt;a href="https://github.com/rdfjs/N3.js/commit/e1cc8dd41f6fe407ac224121cd85c94307e33dae"&gt;e1cc8dd&lt;/a&gt;)&lt;/li&gt; &lt;/ul&gt