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Decreased pulsatile blood flow in the patella in patellofemoral pain syndrome
Näslund, J., Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden, Nobels väg 8, Stockholm, SE-17177, Sweden.
Department of Orthopaedics, Hässleholm Hospital, Hässleholm, Sweden.
Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Physiological Measurements.
2007 (English)In: American Journal of Sports Medicine, ISSN 0363-5465, Vol. 35, no 10, 1668-1673 p.Article in journal (Refereed) Published
Abstract [en]

Background: Anterior knee pain without clinical and radiologic abnormalities has primarily been explained from a purely structural view. A recently proposed biologic and homeostatic explanation questions the malalignment theory. No objective measurement of the pathophysiology responsible for changes in local homeostasis has been presented. Hypothesis: Flexing the knee joint interferes with the perfusion of the patellar bone in patellofemoral pain syndrome. Study Design: Case control study, Level of evidence, 4. Methods: Pulsatile blood flow in the patella was measured continuously and noninvasively using photoplethysmography. Measurements were made with the patient in a resting position with knee flexion of 20°and after passive knee flexion to 90°. In total, 22 patients with patellofemoral pain syndrome were examined bilaterally, and 33 subjects with healthy knees served as controls. Results: The pulsatile blood flow in the patient group decreased after passive knee flexion from 20°to 90°(systematic change in position, or relative position [RP] = -0.32, 95% confidence interval for RP, -0.48 to -0.17), while the response in the control group showed no distinct pattern (RP = 0.17, 95% confidence interval for RP, -0.05 to 0.31). The difference between the groups was significant (P =.0002). The median change in patients was -26% (interquartile range, 37). Conclusions: Pulsatile patellar blood flow in patellofemoral pain syndrome patients is markedly reduced when the knee is being flexed, which supports the previous notion of an ischemic mechanism involved in the pathogenesis of this pain syndrome. © 2007 American Orthopaedic Society for Sports Medicine.

Place, publisher, year, edition, pages
2007. Vol. 35, no 10, 1668-1673 p.
Keyword [en]
Bone, Ischemia, Knee, Pain, Photoplethysmography
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-48377DOI: 10.1177/0363546507303115OAI: diva2:269273
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2011-01-11

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