Article Title: Optimal Clamping Force of Ultra High Molecular Weight Polyethylene Cable is 15 kgf
Author: Rina Sakai*, Toki Yada, Katsufumi Uchiyama, Kazuhiro Yoshida, Takeaki Yamamoto and Masanobu Ujihira
Published Date: April 25, 2022
This study aimed to estimate the optimal clamping force of ultra-high-molecularweight polyethylene (UHMWPE) cables based on contact pressure distributions indicating blood flow by focusing on the mechanical factor of contact pressure. UHMWPE cables with widths of 3 mm and 5 mm were used. A pressure sensor was set on an artificial femur, and the cables were wrapped on simulated tissues and tightened with clamping forces of 10, 20, and 30 kgf based on the indication values displayed on the tightening guns. Removal of the tensioner after clamping was defined as release, and the contact pressure with each clamping force was measured. After the cable with a width of 3 mm was clamped with a force of 10 kgf and released, the contact area was 31.2 mm2; the ratio of the contact area to the entire surface of the cable was calculated, which showed that approximately 30% made local contact. The ratio did not change significantly and remained at 30% even when the clamping force increased to 15 kgf. After the cable with a width of 5 mm was clamped with a force of 10 kgf and released, the contact area ratio was approximately 40% and it remained the same as the clamping force increased to 15 kgf. Blood flow disorders can be avoided with UHMWPE cables fixed under clamping forces of 10 kgf and 15 kgf. Considering the conservation of the fixing force, the optimal clamping force of UHMWPE cables is determined to be 15 kgf.