Lower Extremity Propulsion Biomechanics During A Single Limb Hop For Distance In Patients Following Anterior Cruciate Ligament Reconstruction

Download or read book Lower Extremity Propulsion Biomechanics During a Single Limb Hop for Distance in Patients Following Anterior Cruciate Ligament Reconstruction written by Kassondra Verhoff and published by . This book was released on 2018 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: Context: Anterior cruciate ligament (ACL) injuries have an annual occurrence of 250,000; with more than 50% of these injuries occurring in athletes between the ages of 15-25. Anterior cruciate ligament reconstruction (ACLR) is the most common form of surgical intervention following ACL injuries. Quadriceps weakness has been shown to be persistent years after ACLR, and is a modifiable factor that has been related to the early onset of knee osteoarthritis (OA). The propulsion phase during the single limb hop for distance (SLH) needs to be further examined to better understand how patients following ACLR generate their movement. Objective: To investigate lower extremity (LE) propulsion biomechanics during a SLH in patients following ACLR. Design: Descriptive, cross-sectional. Setting: Laboratory. Patients or Other Participants: 5 ACLR males, 3 ACLR females, and 8 equally matched healthy participants. Inclusion: primary unilateral ACLR, ages 15-45, post physician clearance. Exclusion: multi ligament knee injury, LE joint surgery, LE joint injury within 6 months, neurological impairments. Intervention(s): Participants completed 3 successful SLH trials on each limb. Main Objective Measure(s): The SLH trials were assessed with 12 camera 3D motion analysis. LE biomechanics, power, and ground reaction forces were analyzed at the trunk, hip, knee, and ankle. Results: The peak knee extensor moment was significantly decreased in the ACLR group (0.7 + 0.3) compared to the healthy controls (0.9 + 0.2), with an effect size (ES) of -1.23 (-2.13, -0.33). The ACLR group also had a decrease in knee extensor torque (2.03 + 0.38) compared to the healthy controls (2.48 + 0.14), with an ES of -3.21 (-4.46, -1.97). Conclusion: ACLR individuals demonstrated lower peak knee extensor moments, suggesting these individuals are not generating as much torque at the knee and may indicate other strategies being involved to successfully complete the task.