Weight-bearing

In orthopedics, weight-bearing is the amount of weight a patient puts on an injured body part. Generally, it refers to a leg, ankle or foot that has been fractured or upon which surgery has been performed, but the term can also be used to refer to resting on an arm or a wrist. In general, it is described as a percentage of the body weight, because each leg of a healthy person carries the full body weight when walking, in an alternating fashion.^{[citation needed]}

After surgery of the hip, or of the bones of the leg, ankle, or foot, it is of the utmost importance for recovery to get the right amount of weight-bearing when moving around with crutches or frames.^[1]

The grades of weight bearing for each phase of recovery will be determined by the surgeon. The Anti-Gravity Treadmill can allow testing of weight bearing by lowering effective body weight in 1% increments from 100 to 20% of body weight.^[2]

• Non-weight-bearing (NWB): The leg must not touch the floor and is not permitted to support any weight at all.^[3] The patient may hop on the other leg or use crutches or other devices for mobility. In this grade, 0% of the body weight may be rested on the leg.
• Touch-down weight-bearing or Toe-touch weight-bearing: The foot or toes may touch the floor (such as to maintain balance), but not support any weight.^[3] Do not place actual weight on the affected leg. Imagine having an egg underfoot that one is not to crush.
• Partial weight-bearing: A small amount of weight may be supported by the affected leg.^[3] The weight may be gradually increased up to 50% of the body weight, which would permit the affected person to stand with his body weight evenly supported by both feet (but not to walk).
• Weight-bearing as tolerated: Usually assigned to people that can support from 50 to 100% of the body weight on the affected leg, the affected person independently chooses the weight supported by the extremity.^[3] The amount tolerated may vary according to the circumstances.
• Full weight-bearing: The leg can now carry 100% of the body weight, which permits normal walking.^[3]