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.