Blood tests can be ordered by your doctor to determine if there is a systemic cause for your knee joint pain. Inflammatory markers, C-reactive protein (CRP), is indicative of inflammatory processes in the body.
Your GP can prescribe medication to relieve your symptoms during an acute flare up. Cortisone or anti inflammatory medication will reduce the swelling. It is important to take medication that does not cause digestive side effects (constipation or burning), because you may be on the medication for an extended period of time.
Intra articular gel injections (Synvisc one) helps with joint lubrication and can last for up to six months.
No joint manipulation will take the cause of your symptoms away. Chiropractic manipulation of a knee joint with osteoarthritis can be dangerous because of the physiological changes within the joint. Bony spurs and sclerotic ligaments may be damages with a forceful manipulation.
No brace or knee guard will make your knee more stable. It may make your knee feel more stable, but would you not like to have faith in your own muscles to give you stability. The compression given by a knee brace can help reduce swelling, this tactile support will stimulate muscle activation in the short run. Regular, long term wear will have the opposite effect, and essentially make the muscle around your knee lazy and incapable of carrying the load.