There is not an item of HiFi worthwhile having, if it comes with a risk to health, especially if a underlying health condition is known off.
Speak to a medical professional about your concerns and options on weights you are able to consider to get equivalent function from alternate devices.
The answer will be very clear, select what is best for your looking after ones Skeletal Joints.
I myself with knee conditions have been very satisfied with my discoveries of lightweight alternative materials which are now being used in my Audio System.