The Role of Quadriceps Contraction in Patellar Repositioning - a Computed Tomography Study

Study Overview
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Brief Summary
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Background Previous studies have a great discrepancy concerning the effects of quadriceps contraction on patellar lateral displacement and tilt in patients with patellofemoral pain syndrome. This discrepancy may be caused by lack of information regarding to classifications of patellofemoral alignment under quadriceps relaxed. We hypothesized quadriceps contraction has different effects on each type of patellofemoral malalignment. Methods The investigators expect to recruit 150 subjects with patellofemoral pain syndrome to participate in this study. All patients underwent computed tomography imaging of symptomatic knees, with and without quadriceps muscle contraction in 0°, 15° and 30° of knee flexion. Patellar lateral condyle index and patellar tilt angles of Sasaki and modified Fulkerson were measured to investigate the effect of quadriceps contraction on patellar repositioning.

Detailed Description
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Background Previous studies have a great discrepancy concerning the effects of quadriceps contraction on patellar lateral displacement and tilt in patients with patellofemoral pain syndrome. This discrepancy may be caused by lack of information regarding to classifications of patellofemoral alignment under quadriceps relaxed. We hypothesized quadriceps contraction has different effects on each type of patellofemoral malalignment. We expect to recruit 150 subjects with patellofemoral pain syndrome to participate in this study. All patients underwent computed tomography imaging of symptomatic knees, with and without quadriceps muscle contraction in 0°, 15° and 30° of knee flexion. Patellar lateral condyle index and patellar tilt angles of Sasaki and modified Fulkerson were measured to investigate the effect of quadriceps contraction on patellar repositioning.

Official Title
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The Role of Quadriceps Contraction in Patellar Repositioning-a Computed Tomography Study

Conditions
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Patellofemoral Pain Syndrome

Intervention / Treatment
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* Procedure: Computed Tomography


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: The inclusion criteria for patients with PFPS were suffering from pain with at least two kinds of knee-flexing activities such as: sitting getting up from sitting walking upstairs or downstairs squatting getting up from squatting running kneeling jumping Exclusion Criteria: The exclusion criteria included: The presence of any major medical disease Rheumatoid arthritis, gouty arthritis Recent history (within 3 months) of knee surgery Image findings of osteoarthritis Any deformity of lower limbs

Ages Eligible for Study
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Minimum Age: 20 Years
Maximum Age: 50 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Intervention/Treatment |
| --- |
|Procedure: Computed Tomography|CT imaging of bilateral knee|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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patellofemoral pain, quadriceps contraction