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Knee deformity is the distortion of the knee joint that is characterized by outward or inward bowing of the joint resulting in uneven distribution of the weight across the joint.

Causes:

This usually occurs due to trauma to the knee joint. It can also occur due to certain joint disorders like septic arthritis, osteomyelitis, osteosarcoma or osteoarthritis.

Types & Symptoms:

There are 2 main types of knee deformity:

  • Valgus Deformity – It causes the inward bowing of the knees giving a knock-kneed appearance and putting extra pressure on the outer (lateral) compartment of the knee joint. The characteristic sign of valgus deformity is the inability of the person to touch their ankles together when their knees are together.
  • Varus Deformity – It causes the outward bowing of the knees giving a bow-legged appearance and putting extra pressure on the inner (medial) compartment of the knee joint. The characteristic sign of varus deformity is the inability of the person to touch their knees together when their ankles are together.