You may have an issue similar to mine. As the result of several minor injuries in my late teens I had many joints x-rayed at different times over a few years, and every doctor commented that my joints were odd, at one point the doctor had my other wrist x-rayed so he could compare it to the injured one. The bones in my joints are further apart than is normal. This results in a greater risk of injury to some joints, so one of my main reasons for weight lifting is specifically to strengthen the muscles that stabilize the joints.
I also have a bad knee, I guess from repeatedly hitting the ground with it while playing handball when I was young(<20). It started to be really painful in long car rides, whenever I standed up for long times or had long walks but it never bothered me when I had played some sport.
A year ago I got into a gym and I feared that my knee would break down, amazingly I learnt what you refer to, that weight lifting is one of the best ways to strengthen muscles that are important to the joints. When I thought of weight lifting I just thought of stressing the body, my idea now is completely different, weight lifting is a way of activating some of your more obscure muscles. Never again I got any complain from that knee.
