عنوان مقاله [English]
Purpose & Background: Anterior cruciate ligament injury is one of the most prevalent injuries in sport which has many potential causes and several studies have examined these causes. The purpose of the present study was to investigate relationship between core stability and isometric hip abduction and external rotation strength, and jump-landing biomechanics using Landing Error Scoring System (LESS).
Methodology: Core stability/endurance and isometric lower extremity muscle strength of 30 active men (age of 21.27±2.12 years, height of 177.77±6.59 cm, weight of 69.42±6.94 kg) have been assessed through McGill core stability tests and dynamometry, respectively. Then, subjects have performed LESS test for analysis of their jump-landing biomechanics. Pearson correlation and multivariate regression tests were performed to examine predictive relationship between core stability and isometric hip abduction and external rotation strength values and LESS scores (P≤ .05).
Results: There have been observed no significant relationship between trunk flexor (P=.4), trunk extensor (P=.46), plank (P=.49), side plank to right (P=.41), side plank to left (P=0.4) abduction (P=.44) and external rotation (P=.07) isometric strength and overall LESS score (PConclusion: The findings of the present study showed that there is no significant relationship between core stability/endurance and isometric strength measurements and dynamic biomechanics of jump-landing. This is probably due to the difference in nature of isometric and endurance measurements and dynamic functional movements. Conducting studies regarding screening at-risk athletes is essential in order to reduce serious injuries that threaten athletes career and life. Undoubtedly, using applicable metheods in high-risk technique assessment that can substitute expensive laboratory equipments and can be performed easily in large sample groups are very helpful for sports medicine professionals.
##Spahn G, Schiltenwolf M, Hartmann B, Grifka J, Hofmann G, Klemm H. 2016. The time-related risk for knee osteoarthritis after ACL injury. Results from a systematic review. Orthopade. 45(1):81-90.## Mather R, Koenig L, Kocher M, Dall T, Gallo P, Scott D, Bach BR J, Spindler K. 2013. Societal and economic impact of anterior cruciate ligament tears. J Bone Joint Surg Am. 95(19): 1751-1759. ##Etnoyer J, Cortes N, Ringleb S, Van Lunen B, Onate J. 2013. Instruction and jump-landing kinematics in college-aged female athletes over time. J Athl Train. 48(2): 161-171.##Onate J, Cortes N, Welch C, Van Lunen B. 2010. Expert versus novice interrater reliability and criterion validity of the landing error scoring system. J Sport Rehabil. 19(1): 41-56.##Aminaka N., Pietrosimone B, Armstrong C, Meszaros A, Gribble P. 2011. Patellofemoral pain syndrome alters neuromuscular control and kinetics during stair ambulation. Journal of Electromyography and Kinesiology. 21(4): 645 – 651.##Kibler W, Press J, Sciascia A. 2006. The role of core stability in athletic function. Sports Medicine. 36(3): 189 –198.## Chevidikunnan M, Al Saif A, Gaowgzeh R, Mamdouh K. 2016. Effectiveness of core muscle strengthening for improving pain and dynamic balance among female patients with patellofemoral pain syndrome. J Phys Ther Sci. 28(5): 1518–1523.## Hill J, Leiszler M. 2011. Review and role of plyometrics and core rehabilitation in competitive sport. Curr Sports Med Rep. 10(6): 345–351.## Sharrock C, Cropper J, Mostad J, Johnson M, Malone T. 2011. A pilot study of core stability and athletic performance: is there a relationship? Int J Sports Phys Ther. 6(2): 63–74.## Hewett T, Ford K, Myer G, Wanstrath K, Scheper M. 2006. Gender differences in hip adduction motion and torque during a single-leg agility maneuver. J Orthop Res. 24(3): 416-421.## Wilkerson G, Colston M. 2015. A Refined Prediction Model for Core and Lower Extremity Sprains and Strains Among Collegiate Football Players. J Athl Train. 50(6): 643-50.## Schilling J, Murphy J, Bonney J, Thich J. 2013. Effect of core strength and endurance training on performance in college students: randomized pilot study. J Bodyw Mov Ther. 17(3): 278-90.## Sadeghi H, Shariat A, Asadmanesh E, Mosavat M. 2013. The Effects of Core Stability Exercise on the Dynamic Balance of Volleyball Players. International Journal of Applied Exercise Physiology. 2(2): 1-10.## Lawrence R, Kernozek T, Miller E, Torry M, Reuteman P. 2008. Inﬂuences of hip external rotation strength on knee mechanics during single-leg drop landings in females. Clinical Biomechanics. 23(6) 806–813.## Willson J, Ireland M, Davis I. 2006. Core Strength and Lower Extremity Alignment during Single Leg Squats. Journal of the American College of Sports Medicine. 38(5): 945-52.## Nakagawa T, Moriya É, Maciel C, SerrÃo F. 2012. Frontal plane biomechanics in males and females with and without patellofemoral pain. Med Sci Sports Exer. 44(9): 1747-1755.## Padua D, Marshall S, Boling M, Thigpen C.. 2009. The Landing Error Scoring System (LESS) is a valid and reliable clinical assessment tool of jump-landing biomechanics: The JUMP-ACL study. Am J Sports Med. 37(10): 1996–2002.## Onate J, Guskiewicz K, Marshall S, Giuliani C. 2005. Instruction of jump-landing technique using videotape feedback: Altering lower extremity motion patterns. American Journal of Sports Medicine. 33(6): 831-842.## Padua DA, Boling MC, DiStefano LJ, Onate JA, Beutler AI, Marshall SW. 2011. Reliability of the Landing Error Scoring System-Real Time, a Clinical Assessment Tool of Jump-Landing Biomechanics. Journal of Sport Rehabilitation. 20: 145-156.## DiStefano L, Padua D, DiStefano M, Marshall S. 2009. The Landing Error Scoring System predicts non-contact injury in youth soccer players. Med Sci Sports Exerc. 41(5 Suppl 1): 520–521.## Nesser T, Huxel K, Tincher J, Okada T. 2008. The relationship between core stability and performance in division I football players. J Strength Cond Res. 22(6): 1750-4.## Okada T, Huxel K, Nesser T. 2011. Relationship between core stability, functional movement, and performance. J Strength Cond Res. 25(1): 252-61.## Tse MA, McManus AM, Masters RS. 2005. Development and validation of a core endurance intervention program: implications for performance in college-age rowers. J Strength Cond Res.19(3):547-52.## Saki, F., Rajabi, R., & Tabatabaei, F. 2014. Relationship between Hip and Knee Strength and Knee Valgus Angle during Drop Jump in Elite Female Athletes. Physical Treatments-Specific Physical Therapy Journal. 4(1): 39-46.## Beutler A, de la Motte S, Marshall S, Padua D. 2009. Muscle strength and qualitative jump-landing differences in male and female military cadets: the jump-acl study. J Sports Sci Med. 8(12): 663-671.## Chaudhari A, Jamison, S, Best T. 2012. Proximal risk factors for ACL injury: role of core stability. Berlin: Springer-Verlag.169-183.## Zazulak B, Hewett T, Reeves N, Goldberg B. 2007. Deficits in neuromuscular control of the trunk predict knee injury risk: a prospective biomechanical-epidemiologic study. Am J Sports Med. 35(7): 1123-30.##