Context: Deficits in knee extension strength after anterior cruciate ligament reconstruction have been a major problem. The inadequate recovery of the knee extension strength of surgical limb reportedly delays return to sports and increases reinjury risk. Accordingly, the early detection of knee extension strength deficits after reconstruction may help plan early interventions to manage impairment. This study aimed to clarify the association between knee extension strength at 3 and 6 months after anterior cruciate ligament reconstruction. Design: Retrospective study. Methods: Fifty patients who underwent primary anterior cruciate ligament reconstruction using hamstring grafts were included. At 3 months postoperatively, the limb symmetry index (LSI) of isokinetic knee extension strength (IKE) at 60°/s, degree of swelling, passive range of motion of knee flexion and extension, and anterior leg reach distance were measured. At 6 months postoperatively, the LSI of IKE was measured at 60°/s, which was used as the main outcome. A correlation analysis was performed with the LSI of IKE at 6 months postoperatively as the dependent variable and the LSI of IKE at 3 months postoperatively as the independent variable. Subsequently, a multiple regression analysis was performed, with LSI of IKE at 6 months postoperatively as the dependent variable; LSI of IKE at 3 months postoperatively as the independent variable; and other variables, demographic information, and surgical data as covariates. Results: The correlation analysis revealed that the LSIs of IKE at 3 and 6 months postoperatively were correlated (r = .535, P < .001). In the multiple regression analysis, the LSI of IKE at 3 months postoperatively was significantly associated with that at 6 months postoperatively, even when other variables were included as covariates (R 2 = .349, P = .004). Conclusion: Asymmetry of knee extension strength at 3 months postoperatively could be more useful than other variables related to knee strength in predicting the asymmetry of knee extension strength at 6 months postoperatively.
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Association Between Knee Extension Strength at 3 and 6 Months After Anterior Cruciate Ligament Reconstruction
Sho Mitomo, Junya Aizawa, Kenji Hirohata, Shunsuke Ohji, Takehiro Ohmi, Toshiyuki Ohara, Hideyuki Koga, and Kazuyoshi Yagishita
The Effect of Teeth Clenching on Dynamic Balance at Jump-Landing: A Pilot Study
Tomomasa Nakamura, Yuriko Yoshida, Hiroshi Churei, Junya Aizawa, Kenji Hirohata, Takehiro Ohmi, Shunsuke Ohji, Toshiyuki Takahashi, Mitsuhiro Enomoto, Toshiaki Ueno, and Kazuyoshi Yagishita
The aim of this study was to analyze the effect of teeth clenching on dynamic balance at jump landing. Twenty-five healthy subjects performed jump-landing tasks with or without teeth clenching. The first 3 trials were performed with no instruction; subsequently, subjects were ordered to clench at the time of landing in the following 3 trials. We collected the data of masseter muscle activity by electromyogram, the maximum vertical ground reaction force (vGRFmax) and center of pressure (CoP) parameters by force plate during jump-landing. According to the clenching status of control jump-landing, all participants were categorized into a spontaneous clenching group and no clenching group, and the CoP data were compared. The masseter muscle activity was correlated with vGRFmax during anterior jump-landing, while it was not correlated with CoP. In comparisons between the spontaneous clenching and the no clenching group during anterior jump-landing, the spontaneous clenching group showed harder landing and the CoP area became larger than the no clenching group. There were no significant differences between pre- and postintervention in both spontaneous clenching and no clenching groups. The effect of teeth clenching on dynamic balance during jump-landing was limited.
Sequential Changes in Scapular Range of Motion After An Intervention Using the KOJI AWARENESS Original “Wall Angel Slider” Exercise
Koji Murofushi, Sho Mitomo, Kenji Hirohata, Hidetaka Furuya, Hiroshi Akuzawa, Hiroki Katagiri, Koji Kaneoka, and Kazuyoshi Yagishita
Context: We aimed to evaluate the sequential changes in the scapular range of motion (ROM) after an intervention using the KOJI AWARENESS Original Wall Angel Slider exercise in which reverse motion is applied. Design: This study used a single-group, pretest–posttest design to evaluate changes in scapular ROM following an intervention. Methods: Participants (n = 54) underwent a 2-week intervention in this study. Scapular mobility was screened using the KOJI AWARENESS Self-Screening Scapula Mobility test, and participants with scapular mobility restrictions were recruited (n = 48). The participants performed the Wall Angel Slider exercise involving reverse motion tasks with dynamic sliding movements against a wall. They performed 3 sets of 8 repetitions for 6 sessions in 2 weeks, and adherence to the exercise regimen was monitored using a checklist. The scapular upward rotation and glenohumeral joint external rotation ROM were measured before the intervention, immediately after the first session, and after 2 weeks of the intervention. Results: The participants exhibited significant improvements in scapular upward rotation and glenohumeral external rotation ROM after the first session of an intervention using the Wall Angel Slider exercise and after 2 weeks of the intervention. Conclusion: The KOJI AWARENESS Original Wall Angel Slider exercise effectively improves scapular upward rotation and glenohumeral joint external rotation ROM over a 2-week intervention period, suggesting its potential utility in enhancing scapular mobility and function in clinical practice.
