Time Difference Between Onsets of Lateral and Medial Hamstring Muscles During Gait in Patients With Patellofemoral Pain: A Preliminary Study

Authors : Dilber KARAGÖZOĞLU COŞKUNSU, Filiz CAN, Shavkat KUCHIMOV, N Ekin AKALAN, Önder KILIÇOĞLU, Necla ÖZTÜRK

Pages : 192-197

Doi:10.33808/clinexphealthsci.923264

View : 26 | Download : 15

Publication Date : 2022-03-30

Article Type : Research Paper

Abstract :Objective: Early activation of lateral hamstrings insert ignore into journalissuearticles values(LH); relative to medial hamstrings insert ignore into journalissuearticles values(MH); has been thought to be the cause of abnormal knee abduction and external rotation of the tibia, which affects the orientation of patellar tendon and increases lateral patellofemoral compression. Therefore, early activation of LH relative to MH is considered to have a role in the patellofemoral pain insert ignore into journalissuearticles values(PFP);. The aim of this study was to investigate the time difference between MH and LH onsets in patients with PFP during gait. Methods: Thirteen patients with bilateral PFP insert ignore into journalissuearticles values(mean age 28.73±7.44 years); and 13 asymptomatic subjects insert ignore into journalissuearticles values(mean age 30.47±6.22 years); were recruited in the study. Gait analysis was performed using the ELITE system insert ignore into journalissuearticles values(BTS, Milano-Italy); with video cameras insert ignore into journalissuearticles values(TVC, BTS, Milano-Italy);. Participants were requested to walk at a self-selected speed on a force platform, and EMG data were recorded from MH and LH muscles for 10 initial contacts by using TELEEMG insert ignore into journalissuearticles values(BTS, Milano-Italy);. Time difference between the onsets of the MH and LH was calculated for each initial contact by using moving averaging method, then their mean was obtained for each participant. Results: The time difference between onsets of MH and LH was – 26.9±22.2 ms for PFP subjects and – 11.2±14.2 ms for control subjects, and LH mainly became activated earlier compared to MH in most of the subjects in both groups. There was a statistically significant difference between the time differences of the groups insert ignore into journalissuearticles values(p=0.041);. Conclusion: Our findings suggest that LH displayed an earlier activation in subjects with PFP compared to control subjects during gait.
Keywords : Hamstrings, Surface EMG, Patellofemoral Pain, Gait, Time difference