Clinical trial NCT00760136: The Role of Quadriceps Contraction in Patellar Repositioning - a Computed Tomography Study
Official title: The Role of Quadriceps Contraction in Patellar Repositioning-a Computed Tomography Study
Study type: OBSERVATIONAL
Overall status: UNKNOWN
Conditions: Patellofemoral Pain Syndrome
Keywords: patellofemoral pain
quadriceps contraction
Lead sponsor: National Taiwan University Hospital
Sponsor class: OTHER
First posted: 2008-09-26
Enrollment: 150
Sex: ALL
Minimum age (years): 20
Maximum age (years): 50
Standard ages: ADULT
Accepts healthy volunteers: no
Observational model: CASE_ONLY
Time perspective: RETROSPECTIVE
Sampling method: PROBABILITY_SAMPLE
Study population: Patients with patellofemoral pain.

Brief summary: 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: 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.

Eligibility criteria: 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

Primary outcomes:
Secondary outcomes:
Other outcomes:
Locations:
city: Taipei
country: Taiwan
facility: Mei-Hwa Jan
Study officials:
affiliation: Graduate institute of physical therapy
name: Mai-Hwa Jan, MS
role: STUDY_DIRECTOR
References: