The deformity that is most commonly seen in primary osteoahritis of knee joint?

Deformity seen is varus of the knee, flexion-abduction external rotation of the hip Osteoahritis occurs in elderly people, mostly in the major joints of the lower limb, frequently bilaterally. The hip joint is commonly affected in a population with western living habits, while the knee is involved more commonly in a population with Asian living habits i.e., the habit of squatting and sitting cross-legged. Pain is the earliest symptom. It occurs intermittently in the beginning but becomes constant over months or years. Initially, it is dull pain and comes on staing an activity after a period of rest; but later it becomes worse and cramp-like, and comes after activity. Other symptoms are A coarse crepitus, Swelling, Stiffness, a feeling of &;instability&; of the joint, and &;locking&; resulting from loose bodies and frayed menisci. REF:Maheswari 9TH ED pg: 296