- The impact of abnormal movement patterns have on the lower kinetic chain with regard to injury.
- Identify a few of the causative factors related to pathokinematics.
- Briefly examine the impact pathokinematic movement patterns have on athletic performance.
factors can impact these ground reaction forces including surface, fatigue of the athlete, landing mechanics, etc. Knowing the high GRFs associated with athletic activities, some studies have correlated the degree or severity of the “pathokinematics” to an increase in GRFs. This may indicate why those athletes are at greater risk for injury with these higher demand sports (basketball/volleyball). Several studies have shown pathokinematics also increase with fatigue and may be a contributing factor of why injuries occur later in the game (like soccer/skiing). When combined with sports with high GRFs, then the risk is even greater. As movement patterns break down, ground reaction forces increase with gait and impact, which may result from altered length tension relationships of the musculature of the lower kinetic chain. The change in length tension relationships alters force production of this musculature at a time when there is an increase demand. This results in the muscles’ inability to attenuate the force that is applied which equates to higher forces being distributed further along the kinetic chain and tissues being loaded in a biomechanically disadvantageous fashion. The net result is not only an increased load to the tissue but when combined with valgus and rotational stresses, it creates a shearing stresses to the cartilage and ligaments. Since cartilage and ligaments are weakest in shear forces, this could be one reason why, when combined with high load situations that it results in a ligamentous or cartilaginous tear, pain or reoccurrence of injuries with return to sport. Hence, the more pronounced the pathokinematics and the higher the GRFs or physical demands of the sport, the higher the potential for injury. However, one factor that has not been well investigated is the impact these movements have on athletic performance?
female population on the incidence of noncontact ACL tears. Sun Valley, ID: 23rd Annual Meeting of the
American Orthopaedic Society for Sports Medicine; 1997.
posture and pain, 5th Edition. Lippincott Williams & Wilkins. 2005.
associated with athletic injuries in female collegiate athletes. Am J Sports Med. 1991;1:76-81.
Effectiveness of a neuromuscular and proprioceptive training program in preventing anterior cruciate
ligament injuries in female athletes: 2-Year follow-up. Am J Sports Med. 2005;33:1003-1010.
17. McNair P, Marshall R. Landing characteristics in subjects with normal and anterior cruciate ligament deficient knee joints. Arch Phys Med Rehabil. 1994;75:584-589.
18. Myer G, Ford K, McLean S, Hewett T. The effects of plyometric versus dynamic stabilization and
balance training on lower extremity biomechanics. Am J Sports Med. 2006;34:445- 455.
19. Nessler T. Using Movement Assessment to Improve Performance and Reduce Injury Risk. In J Ath
Ther & Train. 18:8-12. 2013.