thanks for sharing your experience with our dreaded friend Arthur Ritis.
.
I finally got some X-rays, now called imaging, and was told exactly what you had said

(but you didn’t charge $600) about:

(1) “tricompartmental osteoarthritis in the patellofemoral compartment

with subchrondral scierosis, subchondral cysts and osteophytes

 on the tibial projections of intercondylar notch” and

(2) “mild subchrondral sclerosis, cysts and ostophytes

along the symphytic and sacroiliac margins.”

 .

Fortunately, there was “no lateral patellic subluxation to the trochlea” so, as you had already predicted,

with low impact running and stifling my competitive urges, it should be possible still  to enjoy  slower-paced marathons and other physical activities for another 10 - 15 years and more.  Just what the doctor ordered.

.

Thanks again.