Xray recently shows severe joint space narrowing involve the patellofemoral compartment with underlying subchondral sclerosis & osteophyte formation?

Osteoarthritis. These are classical findings of osteoarthritis being spelled out by the radiologist. Osteoarthritis develops as we lose the cartilage that is not seen on X-ray and usually leaves a "joint space" on films. During this degenerative cascade, sclerosis happens to the bone under cartilage and bone tries to increase its surface area when weakened by forming spurs called osteophytes. Good luck. .