Anterior knee pain & retropatellar chondropathy.
Conditions
Interventions
Sponsors
Eligibility
Inclusion criteria
Inclusion criteria: The clinical diagnosis of PFPS was formed if the subject had a self complaint of atraumatic uni- or bilateral anterior knee pain that was aggravated with at least two of the following activities: a positive patella compression test, squatting, prolonged sitting, and ascending of descending the stairs.
Exclusion criteria
Exclusion criteria: Exclusion criteria included pain less than 3 months, prior knee or spine surgery, severe lumbosacral nerve root compression signs. Other exclusion criteria included clinical signs of ligamentous instability or suspected meniscal injury, patellar tendinopathy, (sub)luxations of the patella, pregnancy, osteoporosis, neurologic disorders. MRI, xray and/ or echo will be used for exclusion.
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| The AKPS questionnaire is used as the primary outcome measure The AKPS is a questionnaire with 13 items that together give a maximum of 100 points which lower scores indicates an increasing degree of limitations. (Kujala 1993) The AKPS has high test-retest reliability and good internal consistency (ICC = 0.95) (Horton 2005) The Dutch translation used in this study is similar to the original English questionnaire. The standard error of measurement (SEM) here is 0.78 and the smallest detectable change is (SDC) ± 11.01. (Ummels 2015) This is a scale from 0 mm (no pain) to 100 mm (worst possible pain). | — |
Secondary
| Measure | Time frame |
|---|---|
| As secondary outcomes, the VAS and Biodex are used. The VAS has a good internal consistency, test-retest reliability and responsiveness (Lara Muñoz 2005) The VAS has a minimal Important Change (MIC) of 30% or 20 mm from the starting value. (Ostelo 2008). The VAS questionnaire is used to identify the minimum, maximum and average pain. VAS for average and maximum pain and AKPS are the most reliable and responsive outcome measures in the treatment of PFPS. The AKPS has a moderate correlation with the VAS (r = 0.74) (Crossley 2004). So, it does not always have to give an improvement in function when there is an improvement of the pain. The Biodex has an acceptable reliability and validity (Drouin 2001 Valovich 2001) It gives reliable results for torque, position and angular velocity on repeat testing on the same day and on different days. The validity of the isometric torque and position measurements is acceptable for clinical and research purposes (Drouin 2003). | — |
Countries
Netherlands