Lignin Polyurethane Aerogels: Influence of Solvent on Textural Properties.

This study explores the innovative potential of native lignin as a sustainable biopolyol for synthesizing polyurethane aerogels with variable microstructures, significant specific surface areas, and high mechanical stability. Three types of lignin-Organosolv, Aquasolv, and Soda lignin-were evaluated based on structural characteristics, Klason lignin content, and particle size, with Organosolv lignin being identified as the optimal candidate. The microstructure of lignin polyurethane samples was adjustable by solvent choice: Gelation in DMSO and pyridine, with high affinity to lignin, resulted in dense materials with low specific surface areas, while the use of the low-affinity solvent e.

[Circular soft tissue defect after prolonged application of a strangulating compression stocking].

Wearing a compression stocking over a longer period of time can lead to deep skin and soft tissue defects. This article presents a case of a circular necrosis with an exposed tendon of the tibialis anterior muscle and the Achilles tendon. The use of a peroneus brevis muscle flap led to an adequate coverage of the exposed Achilles tendon.

Ankle Arthrodesis - a Review of Current Techniques and Results.

Ankle arthrodesis continues to be the golden standard in the treatment of end-stage ankle arthritis. Meticulous soft tissue handling, correct positioning of the foot, and stable fixation are crucial for obtaining a favorable result. With current techniques, mostly internal fixation with screws or plates, union rates between 87 and 100% are reported.

Talus Secundarius: Case Series.

Background: Talus secundarius is a very rare accessory bone at the lateral border of the foot. It is attached via a synchondrosis or small synostosis to the lateral aspect of the talar body and has additional facets to the tip of the lateral malleolus and the superior aspect of the calcaneus.

Methods: Over a period of 8 years, we have seen 5 patients with 6 cases of talus secundarius with an average age of 17 years at first presentation to the senior author.

[Syndesmosis injuries at the ankle].

Background: Injuries to the distal tibiofibular syndesmosis are frequent and continue to generate controversy due to an extensive range of diagnostic techniques and therapeutic options.

Objective: The aim of this review is to summarize the current knowledge on syndesmotic instability and to present some recommendations for the clinical practice for acute an chronic injuries.

Material And Methods: Analysis of the current literature concerning the anatomy, etiology, diagnostics and treatment of syndesmosis injuries.