Treatment of local talus osteochondral defects using mosaic autogenous osteochondral plasty

The authors presented the brief incidence analysis of talus osteochondral defect (local joint surface osteonecrosis of the anklebone), its etiology, pathogenesis, symptoms, modern diagnostic algorithm and described proposed surgical procedure. The operation consists of ankle joint arthrotomy, osteonecrotic tissue resection, harvesting of cylindrical mosaic osteochondral graft from low weightbared region of femoral knee joint surface and its implantation into resection cave of the anklebone. The indications to supramalleolar osteotomy for concomitant ankle frontal deformities are grounded. Rigid osteosynthesis and early movements in ankle joint are recommended. Eighteen patients with age from 20 to 58 years old were operated: 8 men and 10 women. In 13 cases (72.3%) the lesion was found in medial edge of talus trochlea, and 5 (27.7%) were lateral lesions. Treatment results of 18 patients evaluated according AOFAS score (H. Kitaoka) improved after operation from (38.2+3.3), to (88.9+3.6) when assessed one year after surgery. Two clinical case reports are presented

Chemical origins of a fast-charge performance in disordered carbon anodes

Fast charging of lithium-ion cells often causes capacity loss and limited cycle life, hindering their use in high-power applications. Our study employs electrochemical analysis and a multiphysics model to identify and quantify chemical and physical constraints during fast charging, comparing state-of-the-art graphite and nanocluster carbon (nC, a disordered carbon) anodes. The combination of modeling material phase separation phenomena with ion-electron transfer theory reveals significant insight. The active material strongly influences charge transfer kinetics and solid-state lithium diffusion. Unlike graphite, nC supports lithium insertion without phase separation, enabling faster lithium diffusion, better volume utilization, and lower charge transfer resistance. We demonstrate practical implications of these material phenomena through multilayer pouch cells made with nC anodes, which withstand over 5000 fast-charge cycles at 2C without significant degradation (<10% at reference 0.2C)