I have bought a farm and kicked a rock sideways with my gumboots. The knee was sore but I continued and kept up my usual ballroom dancing, but now it is swollen and tight about 6 weeks later and the joints in my fingers hurt for the first time. I hadn t slowed down my rigorous activity but now difficulty walking has made me reassess. Thanks, Mn,,lle 60 and usually very active.
Sellotaping gone on this long, this needs evaluation with an exam and an MRI of the knee.  It may only be bursitis, but it could be a torn meniscus. The other possibility, given the multiple joint problem, would be gout, so I would also check your serum uric acid level