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Dislocated Knee

By

Simeon A. Boyadjiev Boyd

, MD, University of California, Davis

Last full review/revision May 2020
CLICK HERE FOR THE PROFESSONAL VERSION

The knee may be dislocated at birth.

Although rare, a dislocated knee in a newborn may be related to the position in the womb before birth. This defect can also occur in children who have Larsen syndrome, which consists of many dislocated joints (elbows, hips, and knees), clubfoot Clubfoot and Other Foot Defects Clubfoot (talipes equinovarus) is a birth defect in which the foot and ankle are twisted out of shape or position. The usual clubfoot is a down and inward turning of the hind foot and ankle... read more Clubfoot and Other Foot Defects , and characteristic facial features (such as a prominent forehead, sunken nose, and wide-spaced eyes). It can also occur in children who have arthrogryposis multiplex congenita Arthrogryposis Multiplex Congenita Arthrogryposis multiplex congenita refers to a variety of conditions that involve limited joint movement. Any condition that impairs the movement of the baby while in the womb can result in... read more Arthrogryposis Multiplex Congenita .

When the infant is examined, doctors find that the leg cannot be bent more than a few degrees.

Immediate treatment with physical therapy Physical Therapy (PT) Physical therapy, a component of rehabilitation, involves exercising and manipulating the body with an emphasis on the back, upper arms, and legs. It can improve joint and muscle function, helping... read more (flexing the infant's leg every day) and splinting the leg in a bent position usually results in a functional knee. Treatment is more complex in infants who have Larsen syndrome, arthrogryposis multiplex congenita, or other problems.

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Separation Anxiety and Stranger Anxiety
An important part of normal development is an infant’s growing attachment to its parents. As this bond strengthens, the infant may express fear or anxiety when the parents leave. This “separation anxiety” typically begins at around 8 months of age and resolves at around 24 months of age. Which of the following is the normal and expected infant behavior in reaction to a parent leaving the room during the time period of separation anxiety?
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