Abstract
Knee Compression Loading When Lying Supine: Effects of Foot Position on Mattress
Highlights
Static compressive varus loading of 100% bodyweight in the rat knee has been shown to produce degenerative changes in the medial compartment joint cartilage, including a decrease in cartilage modulus and thickness and an increase in matrix loss [1]
Knee-moments were comparable to those previously reported for standing but when the feet were hung over the end of the support the extension moment was all but eliminated (P < 0.001)
Findings suggests that for those who sleep supine, a change in sleeping position so that the feet hang over the end of the mattress will eliminate knee compression loading, and this simple intervention may provide temporary pain relief in those with knee-osteoarthritis
Summary
Static compressive varus loading of 100% bodyweight in the rat knee has been shown to produce degenerative changes in the medial compartment joint cartilage, including a decrease in cartilage modulus and thickness and an increase in matrix loss [1]. It has been shown in the rabbit knee, that fifty minutes of isometric loading for 3 days a week over multiple weeks will cause the cells (chondrocytes) that produce and maintain cartilage matrix to die at a higher rate compared to that following comparable concentric loading [2]. It is worth noting that the study by Dahaghin and colleagues [5] found that routine prolonged standing was not a risk factor in knee-OA
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