The Effect of the Ratio of Waist Circumference to Thigh Circumference in Obese Patients on the Therapeutic Efficacy of Medial Unicompartmental Knee Arthroplasty for Knee Osteoarthritis.

Background: Medial unicompartmental knee arthroplasty (UKA) is a surgical procedure that replaces only the damaged medial compartment of the knee joint, preserving the healthy lateral compartment. Previous studies have investigated the impact of body mass index (BMI) on the efficacy of UKA for knee osteoarthritis, but the effect of the ratio of waist circumference to thigh circumference in obese patients has not been reported. This study aimed to explore the impact of the waist-to-thigh ratio on the efficacy of medial UKA in obese patients with knee osteoarthritis.

Measurement of Zinc Ions in Seawater Samples Using a Microfluidic System Based on the GR/CeO/Nafion Material.

Considering that heavy-metal contamination of seawater is getting worse, building a quick, accurate and portable device for detecting trace zinc in seawater in real time would be very beneficial. In this work, a microfluidic system was developed that includes a planar disc electrode, a micro-cavity for detection, an electrochemical workstation, a computer, a container for waste liquid reprocessing, an external pipeline and other components as well as a graphene/cerium oxide/nano-cerium oxide/Nafion composite membrane was used to modify the planar disc electrode (GR/CeO/Nafion/Au) to investigate the electrochemical behaviour of Zn(II) using cyclic voltammetry, square-wave voltammetry and orthogonal test methods. Under optimal experimental conditions, the peak reaction current of Zn(II) showed a good linear relationship with the concentration of Zn(II) in the range of 1-900 μg/L with a correlation coefficient of 0.