This is Dr Basu, experienced Internal Medicine Specialist.
I am here to address your concerns and provide great service.
Thanks for detailed information.
Your pain does radiate from your knee downwards.
You also experienced left knee swelling once.
However your pain mainly seems to be cramp like.
Pain is more pronounced than swelling and mostly bilateral.
These factors suggest you likely have some degree of nerve compression as well.
Nerves supplying the knees and legs can get compressed either at your lower spine or at the back of knees.
Chronic osteoarthritis can cause development of baker's cysts at the back of knees and often can cause nerve compression.
Nerve compression can also result in leg weakness.
Another possibility can be blood circulation problem.
Reduced blood flow to the legs can also cause pain and weakness especially after walking some distance.
Xrays will not be diagnostic in such cases.
MRI scan of the knee, lower spine to look for nerve compression, ABI index and duplex ultrasound of the leg arteries should be considered for further evaluation.
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