If you mean ligaments, they are the tissues in the body that hold the joints together.
legaments legaments
Tendons and/or legaments
Tendons and/or legaments
Torn legaments
sometimes swelling constant hurting or throbbing and hard to do serious work with the arm mentioned
According to the related link, monkeys can walk on 4 legs. They can also walk on 2 legs, but for shorter periods of times. As the state "4 legs", and not "limbs", monkeys probably have 4 legs, which answers you question.
Arthritis in itself has no effect on ligaments and muscles, However pain as a result of the build up of scar tissue and bone can lead to problems with these. I have feet that I have been told By rhuematologists are badly affected by RA, and that I must have a high pain threshold to still be walking around without a limp. Personally I would put this down to the fact that I spent most of my life in the building trade and as a result the muscles in my feet were always kept in tip top order giving the joints and bones good support. There were however short periods of time when I was forced to limp around as a result of inflammation in my feet.