Patellofemoral pain syndrome (PFPS) is a multifactorial pathology characterized by diffuse retropatellar and peripatellar pain in the knee joint, exacerbated by overloading activities on the patellofemoral joint. However, this disease showed high degree of patients not responsive to therapeutic strategies. This condition occurred because several factors is related to disease such as: (1) proximal factors (involving trunk and hip), (2) local factors (surrounding and or within the patellofemoral joint) and (3) distal factors (involving ankle and foot). Thus, the identification of clinical subgroups based in anatomic changes (proximal, local and distal factors) is a recent strategy that could help in the therapeutic strategies focused on the etiology of the disease, improve responsiveness to treatment, clinical and functional benefits.
Study Type
OBSERVATIONAL
Enrollment
45
(1) Muscle trunk endurance test; (2) Hip isometric strength (abductor, lateral rotation, extension); (3) Knee extensor isometric strength; (4) unilateral squat; (5) navicular drop test; (6) muscle architecture at rest of gluteus medius, gluteus maximus,vastus lateralis, vastus medialis and rectus femoris; (7) muscle activation during unilateral squat (gluteus and quadriceps muscles); (8) pennation angle of obliques vastus medialis; (9) medial patellofemoral ligament length; (10) knee pain.
Exercise Research Laboratory
Pôrto Alegre, Rio Grande do Sul, Brazil
Muscular strength tests of hip and knee muscles.
Isometric torque of knee extensor muscles, hip abductor, extension and medial rotation muscles through hand-held dynamometer tests will be performed to create clinical subgroups after cluster analysis for a focused intervention in the second step.
Time frame: 1 day
Muscle thickness measures
Muscle thickness (in millimeters) of vastus lateralis, vastus medialis and rectus femoris muscle. Muscle thickness of gluteus medius, maximus and peroneus muscle through ultrasound equipment. Tests Test will be performed to create clinical subgroups after cluster analysis for a focused intervention in the second step.
Time frame: 1 day
Muscle activation of knee, hip and foot muscles
Muscle activation measures of quadriceps, gluteus maximus, gluteus medius and peroneus muscles during unilateral squat through surface electromyography. Tests will be performed to create clinical subgroups after cluster analysis for a focused intervention in the second step.
Time frame: 1 day
Kinematics during unilateral squat
Pelvis, hip, knee and ankle angular displacement during unilateral squat through kinematics analysis. Tests will be performed to create clinical subgroups after cluster analysis for a focused intervention in the second step.
Time frame: 1 day
Fascicle length measures
Fascicle length (in milimeters) of vastus lateralis, vastus medialis and rectus femoris muscle through ultrasound equipment. Tests Test will be performed to create clinical subgroups after cluster analysis for a focused intervention in the second step.
Time frame: 1 day
Pennation angle measures
Pennation angle (in °) of vastus lateralis, vastus medialis and rectus femoris muscle through ultrasound equipment. Tests Test will be performed to create clinical subgroups after cluster analysis for a focused intervention in the second step.
Time frame: 1 day
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