аЯрЁБс>ўџ 8:ўџџџ7џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџьЅСq` №П>(bjbjqPqP 8*::з BџџџџџџЄ††††ЎH*>ЪЪЪЪ4ў >n `     ё ё ё Щ Ы Ы Ы Ы Ы Ы $Ю h6vя 9†(ё ё ё  # я ††  л(    / @† † Щ  ё Щ   ††  Р“їэOЩЪo R Ѕ $> 0n  ЌС @Ќ Ќі$ ˆё ё  ё ё ё ё ё я я  ё ё ё n ё ё ё ё >>$bdЦ>>bЦ>>>††††††џџџџ Effects of a sacroiliac joint manipulation on gait mechanics of individuals with patellofemoral joint pain. Grindstaff TL, Franz JR, Beazell JR, Hertel J, Kerrigan DC, Ingersoll CD: University of Virginia; Charlottesville, VA. Context: Decreased quadriceps activation is present in individuals with patellofemoral joint pain (PFJP) and has been shown to effect joint kinematics and kinetics during gait. A sacroiliac joint manipulation has been shown to decrease subjective reports of pain and alter quadriceps activation, but the effects on gait are unknown. Objective: To examine changes in knee joint kinematics and kinetics following a sacroiliac joint manipulation in individuals with PFJP. Design: A single-blind randomized control trial with one between-factor, treatment group (sacroiliac joint manipulation, lumbar passive range of motion, prone extension) and one within-factor, time (pre and post intervention) used to compare peak knee flexion angle and peak external knee flexion moments during the stance phase of running. Setting: University motion analysis laboratory. Participants: Eighteen subjects (9 female and 9 male) with PFJP. Interventions: A 10 camera motion analysis system (VICON 624) was interfaced with a custom built treadmill (Advanced Mechanical Technology, Inc., Watertown, MA) with 3 embedded force plates used to capture kinetic and kinematic data while running at a self selected pace for 3 minutes. During this time 3, 15-second trials were recorded for data analysis. Motion analysis video were sampled at 250 Hz and ground reaction forces were collected at 1000 Hz. Next, participants were randomized to 1 of the 3 treatment interventions: sacroiliac joint manipulation, lumbar passive range of motion, or prone on elbows. Following experimental intervention gait kinetics and kinematics were reassessed using similar methods. Two separate single factor repeated measures ANOVAs were performed to compare changes in peak knee flexion angle and peak external knee flexion moments. The probability was set at P d" .05 for all statistical tests. Main Outcome Measures: Peak knee flexion and peak external knee flexion moments during the stance phase of running were calculated using raw ground reaction forces and kinematic data through a commercialized full-inverse dynamic model (VICON Plug-In-Gait). Kinetic data were normalized by body mass and height, and reported in Nm/kg. Results: There were no significant differences (F2,15 = 0.81, P = 0.46) in peak knee flexion angle (degrees) between groups, Manipulation Pre=41.48 (6.47), Post=41.54 (5.71); PROM 35.80 (10.79) Post= 36.30 (10.94); Prone on Elbows Pre=43.09 (3.92), Post=41.75 (4.57). There were no significant differences (F2,15 = 1.22, P = 0.32) in peak external knee flexion moments (Nm/kg) between groups, Manipulation Pre=0.57 (0.22), Post=0.49 (0.19); PROM Pre=0.44 (0.34), Post=0.46 (0.39); Prone on Elbows Pre=0.66 (0.16), Post=0.61(0.22). Conclusions: Interventions directed at the lumbopelvic region do not seem to have an acute effect on running mechanics in individuals with PFJP. Future studies should determine if there is a subset of individuals with PFJP who may demonstrate changes in running mechanics following sacroiliac joint manipulation. 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