Disease and usual joint affected

Gout - MTP of great toe 

Pseudogout - knee 

Rheumatoid arthritis - metacarpophalangeal joint 

Ankylosing spondylitis- sacro iliac joint 

Septic arthritis - knee

Syphilitic arthritis - knee 

Gonococcal arthritis - knee

Diabetic Charcot joint - foot(mid tarsal)

Senile osteoporosis- vertebra 

Paget’s disease - pelvis 

Actinomycosis - mandible 

Hemophillic arthritis - knee 

Acute osteomyelitis - lower end of femur 

Brodie’s abscess - upper end of tibia 

Osteochondrosis dessicans - knee elbow