Squeaky Left Knee After Running 20kmph
BTW, I don't what 'kmph' is. I presume a distance, perhaps a misspelling. 20km (about 12-1/2 miles) is a good distance. Running that far in an hour would be world record breaking.
What destroyed my knee cartilage wasn't any single event distance, but years of constant running and climbing. And doing it in combat boots, often carrying a heavy load, over uneven rough terrain.
A tread mill can be kinder, and certainly with quality jogging shoes, that have proper pronation and other personalized considerations. For years in the 1980s I couldn't wear Nike's for recreational running, because their typical pronation was wrong for me, really hurt my knees. Another thing I couldn't do was run on short, indoor banked tracks. Even when I reversed my direction on alternate days.
When I protested to my Army orthopedic doctor that I couldn't have worn out my knees at 36, he used a car tire analogy. "Some people get 40,000 miles or more out of their tires. Others only get 20 because of the way and amount they drive, or tire quality. What you've got there is a 50,000-mile knee, and it's bald." Ah, OK...
So I agreed to have the recommended surgery, and that improved it. But the joint bone damage was permanent, and already developing arthritis. That has only worsened with age. At this point my only option is total joint replacement, but I'm trying to delay that.
But you need to hear from your own medical expert, in sports medicine or an orthopedic specialist who's examined you. We can relate our own stories to you, but we aren't you. Plus injuries, including sports injuries, happen at any age. And variables like healing time, past medical history, genetics, and exact nature of any injury, are highly individual.