07/07/2022
Varus and valgus alignment (shown in images), good or bad? Does it matter in the development of knee osteoarthritis (OA)?
As always in physiotherapy, it’s case dependent. This is some interesting research that might add some value to the conversation
The cited study was observed over a 2.5 year period. In people without knee OA, a knee varus alignment was associated with a higher prevalence of developing OA. In the people who already had OA, then both a varus and valgus alignment were associated with OA progression. The comparison was completed with neutral angle knees
In this study it was found that varus alignment increased medial (inner) OA progression, and a valgus alignment with lateral (outer) OA progression. This is also shown in the image, how a certain angle/shape can lead to a higher pressure/compression in different knee compartments
So how does this affect a person with knee OA, or who is likely to develop OA, and the clinical value for a physiotherapist?
This study shows that, although knee strength can be an issue, there is also a strong biomechanical aspect in the development of knee OA, and these biomechanical aspects will have to be assessed and treated according to the person’s current biomechanical setup
Important to consider, is that the knee has movement in only 2 planes (sagittal and transverse) of motion, which lessens its mobility potential
In my opinion the knee’s resting alignment is going to be strongly influenced by the position of the foot and the position of the hip, which have movement in 3 planes, and access to considerably greater ranges of motion because of this
Keeping this simplistic, to improve knee health, it will be about assessing what position the knee (as well as foot, hip) is currently occupying, why it is currently occupying this position, and then, do we have the ability to create change. This will involve using movement and exercise to promote a better resting alignment, and strengthening of the appropriate muscles to do this
Time of course will be required to achieve this, depending on the amount of knee alignment/angle a person is currently in