Relative displacement of the tendon and subsynovial connective tissue using ultrasound captures different phenomena than mechanical tendon shear

摘要: Abstract The most common finding in carpal tunnel syndrome is fibrosis and thickening of the subsynovial connective tissue (SSCT). While SSCT mediates tendon gliding tunnel, this histopathology suggests excessive shear forces are involved injury development. Ultrasound often used to quantify relative motion between finger flexor tendons as an indirect measure “shear-strain”; however, underlying mechanical implications using ultrasound not well understood. middle digitorum superficialis (FDS) 8 cadavers was moved a combination 2 wrist postures (neutral, flexed), 3 velocities (5, 10, 15 cm/s), (10, 20, 30 N) assess ultrasound-based FDS-SSCT displacement while simultaneously quantifying frictional work tunnel. We found independent velocity effects for both constructs (relative displacement, ηp2=0.862, p η =0.937,