Corresponding vacuum function length: symptomatic mechanism

2021-01-26 12:00 AM

An apparent longer leg, or unequal function, can occur at any point, from the ileum to the lowest edge of the foot, for a number of reasons.

When measured from navel to ankle in each leg, there is a difference between the legs. Measurement technique describes unilateral asymmetry of the lower extremities without any concurrent contraction (bone) or components of the lower limb.

Figure. Measure foot length

A.Leg length is clearly the distance from the belly button to the inner ankle. B. Pelvic tilt causes a long leg disparity


Deformed leg muscles.

Adaptive shortening of soft tissues.

Shorten each segment.

Ligament loose.

Axial deviation.


A markedly longer leg or unequal function can occur at any point from the ileum to the lowest edge of the foot for a number of reasons.

Ligament lose

In this situation, the bones are similar in length. However, the ligaments on one side (for example, in the hip joint) may last longer or longer than their remaining ligaments on the opposite side, causing the thighbone to be lower during folding and sitting movements. appears also on measurement.

Slit joints

The joint contraction creates stiffness and does not allow for full operation. If the knee joint is held in the folded position, the affected sides will not be stretched as long as the opposite side even in a fully extended position.

Mechanical foot changes

The excessive tilt of the legs inward and/or maybe accompanied by a reduced arch height compared to 'normal' legs, resulting in one or shorter functional leg length


In true leg length inequalities, significant changes in predominantly nonspecific clinical differences and accuracy in clinical measurement have been reported. It is therefore of limited value as a diagnostic or prognostic test. If there is irreversible material in leg length (> 2 cm) along with clinical signs, reinforce the examination.