eating more beef steaks will help, that kinda icky white stuff, usually referred to as "gristle" is rich in collagen, and it's the same stuff the joints are lined with for shock absorption

i have this issue with my left knee also, and the other thing i will say about it is that if my allergies are flaring up the inflammation in the joints also gets bad and i'm almost unable to take the strain of just walking down the stairs or up a moderate slope like my walk to the shops

got the allergies reducing again... for me the main trigger is celiac autoimmune reaction, and the joint pain in that knee seems to flare up before many of the other symptoms become obvious