Whui Jae Jin

Biomechanical Effect of Cyclic Loading on the Reconstructed Posterior Cruciate Ligament: Comparison between Inlay and Transtibial Technique

Purpose : To compare differences in the biomechanical characteristics of posterior cruciate ligament (PCL) reconstructed by the inlay and transtibial techniques. Materials and Methods : PCL reconstruction was performed in 12 pairs of porcine hindlimbs using the inlay and transtibial techniques. Cyclic load testing was carried out in three steps. The first step was 750 cycles at 35-350 N, the second 10,000 cycles at 35-350 N, and the third 10,000 cycles at 45-450 N. Length changes of the reconstructed PCLs were measured and the sites of rupture observed. Results : Among the 10 pairs of limbs that completed the test procedure, the graft ruptured before step 3 in all specimens except one in the transtibial group, and seven specimens completed step 3 testing in the inlay group. Comparing the load elongation curves obtained in step 2 tests, more elongation of the graft was evident in the transtibial group (p

Discomfort in Winter Season after Fixing Lateral Malleolar Fracture with Plates - A comparison between stainless steel and titanium plate -

Purpose : The purpose of this study was to find a method of proving cold discomfort in patients who complain during the winter seasons, after receiving an internal fixation with a metal plate, and to determine the different in the developments of cold discomfort according to the type of metal plate used. Materials and Methods : Among 26 cases of lateral malleolar fracture, 16 stainless-steel plates and 10 titanium plates were compared. Discomfort was induced by placing ice over both lateral malleoli (ice provocation test), and the side on which discomfort was induced first was recorded. Results : Ten patients who felt discomfort in the winter, among which 8 cases stainless-steel plate and 2 cases titanium plate. The degree of pain was rated as 3.6 on average (ranging 2-4) on the VAS (visual analogue scale). Conclusion : Cold discomfort during the winter season can be confirmed by using the ice provocation test (p=0.0004). The frequency of discomfort during the winter season was higher (p=0.126) in cases filted with stainless-steel plate (50%) than in those with a titanium plate (20%).