Well I'm just curious.
Have you ever injured that are before.
(Including your leg, lower abdomen?)

If you had a previous muscular or skeletal injury it could have caused your balance to alter, placing additional strain on that hip, perhaps damaging the cartilage at the joint of leg and hip.

Strenuous sports could also result in this. If you've ran distance before or competed in soccer, football etc, it's easy to injure these areas or simply wear them down.

Also excessive weight can cause cartilage to wear down.
aT 245 and 5'9" I assume your reither very muscualr or somewhat ovwerweight. This could result in extra wear on cartilage or the loss of synovial fluid.

Perhaps you could take some fish oils