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Patellofemoral Pain (PFP) is a common knee problem, primarily affecting adolescents and young adults. PFP is characterised by significant retropatellar and/or peripatellar pain and impairment of function and quality of daily life. Exercise therapy is unequivocally recommended as a core component of the management of PFP. Different exercise types (e.g. quadriceps strengthening, hip strengthening and functional/neuromuscular exercises) have been investigated, with knee and hip strengthening exercises as the most common and recommended types. These exercises approaches produce similar small to moderate effects on pain and physical function. However, the PFP population is very heterogeneous and "one-size-fits-all"-approaches presumably are sub-optimal because the heterogeneity is ignored. The heterogeneity probably explains the overall limited beneficial effects of exercise, and the lack of differences in direct comparisons of different exercise types. In that sense, it is not unlikely that certain patient characteristics may predict outcome success of either a hip training program or a training program that focus on the quadriceps but this remains to be shown.
This study has two aims:
According to the study aims we pursue the following hypothesis:
The second study aim is to explore possible candidate patient characteristics that may associate with differential outcomes. As this is exploratory, the pursuit of this aim is hypothesis-free.
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Inclusion criteria
A clinical diagnosis of PFP in at least one knee
Visual analogue score rating of pain during activities of daily living during the previous week at a minimum of 3 on a 10 cm scale.
Insidious onset of symptoms unrelated to trauma and persistent for at least 4 weeks.
Pain in the anterior knee associated with at least 3 of the following:
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200 participants in 2 patient groups
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Data sourced from clinicaltrials.gov
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