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Go to Editorial ManagerIn this study, an experimental and numerical approach is used to evaluate a transtibial bone-anchored prosthesis system that includes an osseointegration implant composed of Ti-6Al-7Nb. The work addresses three factors that are critical to clinical and biomechanical performance: (1) the mechanical properties and corrosion behavior of the implant materials, (2) enhancement of bioactivity via hydroxylapatite (HAp) surface coatings, and (3) structural response of the tibia-implant construct under physiologically representative gait loads. A compressive test was also realized, and the good mechanical behavior of Ti-6Al-7Nb (σu =1271 MPa; σy = 755 MPa) revealed its ability to be used for load-bearing applications. The HAp coatings had a homogeneous nanostructure, greatly enhanced corrosion resistance (89% protection efficiency), and induced apatite-like formation in simulated body fluid. Peak ground reaction force was 1060 N, recorded using gait analysis, and used for implant biomechanics analysis in FE modelling. The equivalent stress of the model was low (11.95 MPa), its deformation small (0.114 mm), and the safety factor high (11.7), indicating that the implant‐bone interface had good structural stability. Taken together, these data demonstrate that Ti-6Al-7Nb osseointegrated prostheses for transtibial amputees exhibit good mechanical reliability and bioactivity, offering a stable load-transfer profile suitable for long-term clinical application.
Many joints in the body depend on cartilage for their mechanical function. Since cartilage lacks the ability to self-heal when injured, treatments and replacements for damaged cartilage have been created in recent decades. The mechanical tests had an important role in the treatment and designing of the replaced cartilage. There are two types of cartilages in the knees: fibrocartilage (the meniscus, it is a special type of cartilage) and hyaline cartilage. Its mechanical properties are important because structural failure of cartilage is closely related with joint disorders. This study aimed to determine the stress-strain curve to give broader understanding of the material’s properties. The results of this study could help to develop computational models for evaluating mechanics of knee joint, predicting possible failure locations and disease progression in joints.The study involved two specimens taken from bovine, the first was the articular cartilage with subchondral bone and the second was the meniscus cartilage each one loaded on a compressive testing machine to compute the displacement, and the force applied, enabling the calculation of the stress-strain curve of the material.Specimen failure occurred in the articular cartilage surface at a force break of 73.8N and get force peak about 87.2 N. The meniscus cartilage failure had occurred at a force break of 29.2 N and get force peak about 34.9 N.