Thank you for the information you have provided here. I the older I get the more conscious I am of preserving my joints. As a high country backpack deer and elk at age 53, I workout, train and eat right year around. I try to keep my hunting pack under 40lbs. But for packing meat, usually downhill, I may go up to 80 or 100lbs to save trips. Do these infrequent exposures do much damage to joint health?
Let me answer your question this way
We're the same age.
After I walk on blacktop or concrete for long periods of time my right kne becomes inflamed and stiffens up.
The only time I do that is when I walk my dog on the road near my house.
It would be easy for someone who doesn't know me to say that walking my dog is wrecking my knee.
I've spent 50 of my 54yrs getting, punched, kicked, kneed, slammed, knee locked, arm barred, etc....
I have also had my fair share of hard landings and crashes on bikes, motorcycles, snowboards and skateboards.
Life is a cumulative effect.
If you're a healthy, lean, physically strong, regularly active person who doesn't have a genetic predisposition for arthritis then it's not likely to be a problem.
If you maintain a high level of capillary density (endurance), train intelligently specifically for rucking and manage fatigue in your strength training then hauling meat will be even less of a stressor on your body.
If you're over fat, regularly sedentary, not very strong and eat a poor diet it is more likely that hauling heavy weight out of the mountains is going to take its toll on your body