scholarly journals VASTUS LATERALIS OBLIQUE ACTIVITY DURING GAIT OF SUBJECTS WITH PATELLOFEMORAL PAIN

2017 ◽  
Vol 23 (2) ◽  
pp. 88-92
Author(s):  
Gilmar Moraes Santos ◽  
Karina Gramani Say ◽  
Flávio Pulzatto ◽  
Thiele de Cássia Libardoni ◽  
Larissa Milani Brognoli Sinhorim ◽  
...  
Keyword(s):  
Knee Joint ◽  
Vastus Lateralis ◽  
Pain Syndrome ◽  
Patellofemoral Pain Syndrome ◽  
Patellofemoral Pain ◽  
Flexion Angle ◽  
Oblique Muscle ◽  
Electromyographic Activity ◽  
Healthy Controls ◽  
Patellar Stability

ABSTRACT Introduction: So far, little is known about the behavior of electromyographic activity of vastus lateralis oblique muscle during treadmill gait in subjects with and without patellofemoral pain syndrome. Objective: The purpose of this study was to investigate the electromyographic activity of the patellar stabilizers muscles and the angle of the knee joint flexion in subjects with and without patellofemoral pain syndrome. Method: Fifteen subjects without (21 ± 3 years) and 12 with patellofemoral pain syndrome (20 ± 2 years) were evaluated. The electromyographic activity and flexion angle of the knee joint were obtained during gait on the treadmill with a 5 degree inclination. Results: The knee flexion angle was significantly lower in the subjects with patellofemoral pain syndrome when compared with the healthy controls. The electromyographic activity of vastus lateralis longus was significantly greater during gait on the treadmill with inclination in subjects with patellofemoral pain syndrome. The results also showed that the electromyographic activity of vastus lateralis oblique and vastus medialis oblique were similar in both groups, regardless of the condition (with/without inclination). Conclusion: We have shown that knee kinematics during gait differs among patients with and without patellofemoral pain syndrome and healthy controls and that a different motor strategy persists even when the pain is no longer present. In addition, the findings suggested that the vastus lateralis oblique has a minor role in patellar stability during gait.

Evaluating electromyographic activity of vastus medialis obliqus, vastus lateralis, and hamstrings in women with patellofemoral pain syndrome

2020 ◽  
Author(s):  
Mahsa Mazaheri ◽  
Alireza Motealleh ◽  
sobhan sobhani ◽  
amin kordi yoosefinejad
Keyword(s):  
Healthy Subjects ◽  
Vastus Lateralis ◽  
Pain Syndrome ◽  
Patellofemoral Pain Syndrome ◽  
Patellofemoral Pain ◽  
Emg Activity ◽  
Tibial Rotation ◽  
Electromyographic Activity ◽  
Vastus Medialis ◽  
Significant Difference

Abstract Background: Temporal difference in activation of medial-lateral hamstrings could lead to external tibial rotation. It was assumed that patients with patellofemoral pain syndrome (PFPS) exhibit altered medial-lateral hamstrings muscular pattern during functional tasks. Objectives: The aim of this study was to compare the electromyography (EMG) activity of quadriceps and hamstrings in patients with PFPS and healthy subjects during stair descending. Design: cross sectional comparative study Setting: Motion analysis Lab, Rehabilitation research center, Shiraz University of Medical Sciences Participants: 24 women with PFPS and 24 healthy subjects, aged 18-40 years recruited through convenience sampling method participated in this study. Interventions: The EMG activity of vastus medialis obliqus (VMO), vastus lateralis (VL), medial (MH) and lateral hamstrings (LH) recorded during stair descending. Main outcome measures: Onset latency and intensity of muscle activity measured relative to the moment of foot contact. Results: There were statistically significant difference in onset of hamstrings heads (LH-MH) between groups (p=0.014). The BF activated before ST in PFPS group. Normalized muscular activity was significantly reduced for VMO (p=0.002), VL (p=.045), and LH (p=0.019) in PFPS patients. Conclusions: Difference in temporal activation patterns of BF and ST may result in lack of rotational knee stabilization and lead to increased patellofemoral joint pressure. Earlier activation of LH rotates tibia externally, and hence, produced lateral patellar tracking.

scholarly journals Changes in Knee Biomechanics After a Hip-Abductor Strengthening Protocol for Runners With Patellofemoral Pain Syndrome

2011 ◽  
Vol 46 (2) ◽  
pp. 142-149 ◽  
Author(s):  
Reed Ferber ◽  
Karen D. Kendall ◽  
Lindsay Farr
Keyword(s):  
Muscle Strength ◽  
Knee Joint ◽  
Pain Syndrome ◽  
Patellofemoral Pain Syndrome ◽  
Patellofemoral Pain ◽  
Genu Valgum ◽  
Abductor Muscle ◽  
Muscle Strengthening ◽  
Peak Knee ◽  
Hip Abductor

Abstract Context: Very few authors have investigated the relationship between hip-abductor muscle strength and frontal-plane knee mechanics during running. Objective: To investigate this relationship using a 3-week hip-abductor muscle-strengthening program to identify changes in strength, pain, and biomechanics in runners with patellofemoral pain syndrome (PFPS). Design: Cohort study. Setting: University-based clinical research laboratory. Patients or Other Participants: Fifteen individuals (5 men, 10 women) with PFPS and 10 individuals without PFPS (4 men, 6 women) participated. Intervention(s): The patients with PFPS completed a 3-week hip-abductor strengthening protocol; control participants did not. Main Outcome Measure(s): The dependent variables of interest were maximal isometric hip-abductor muscle strength, 2-dimensional peak knee genu valgum angle, and stride-to-stride knee-joint variability. All measures were recorded at baseline and 3 weeks later. Between-groups differences were compared using repeated-measures analyses of variance. Results: At baseline, the PFPS group exhibited reduced strength, no difference in peak genu valgum angle, and increased stride-to-stride knee-joint variability compared with the control group. After the 3-week protocol, the PFPS group demonstrated increased strength, less pain, no change in peak genu valgum angle, and reduced stride-to-stride knee-joint variability compared with baseline. Conclusions: A 3-week hip-abductor muscle-strengthening protocol was effective in increasing muscle strength and decreasing pain and stride-to-stride knee-joint variability in individuals with PFPS. However, concomitant changes in peak knee genu valgum angle were not observed.

scholarly journals Braking and propulsive impulses in individuals with patellofemoral pain syndrome when walking up and down stairs

2014 ◽  
Vol 20 (4) ◽  
pp. 442-447
Author(s):  
Marcelo Camargo Saad ◽  
Renato Moraes ◽  
Lilian Ramiro Felicio ◽  
Débora Bevilaqua-Grossi
Keyword(s):  
Clinical Condition ◽  
Pain Syndrome ◽  
Patellofemoral Pain Syndrome ◽  
Patellofemoral Pain ◽  
Ground Reaction Forces ◽  
Healthy Controls ◽  
Painful Condition ◽  
Motor Strategy ◽  
Reaction Forces ◽  
Biomechanical Parameters

Patellofemoral pain syndrome (PFPS) is a prevalent clinical condition and it affects gait behavior. Braking and propulsive impulses are important biomechanical parameters obtained from ground reaction forces (GRF), which combine the amount of force applied over a period of time. The aim of this study was to evaluate these impulses while walking up and down stairs in healthy controls and PFPS individuals. The results did not reveal significant differences in braking and propulsive impulses between groups during these activities. Thus, the painful condition on a simple functional activity was insufficient to change the motor strategy to walking up or down the stairs.

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