L4-L5 Segments
Innervation of the hip flexors, hip adductors, and knee extensors are usually complete; however, hip abductors and hip extensors remain weakened. Coxa valga and acetabular dysplasia are still a concern.
Typically, hip dislocation occurs later at the L4-L5 segmental levels. Newborns with a well-defined lesion sparing L4 lie in a typical position of hip flexion, hip adduction, and knee extension. When the L5 segment is spared, the gluteus medius, gluteus maximus, and hamstrings have partial strength and knee extensor contracture is less likely. Because the tibialis anterior is unopposed by its plantarflexion and everter antagonists, a calcaneovarus foot deformity develops. If the peroneus muscles are spared, the varus is eliminated. Although the plantar flexors are partially innervated, they are not strong enough to counter the strong force of the ankle dorsiflexors.
More medical literature on Medic.Studio
More on the topic L4-L5 Segments:
-
Infectious diseases -
Internal diseases -
Obstetrics and Gynaecology -
Pediatrics -
Veterinary medicine -
-
Conflictology -
Ecology -
Economy -
Finance -
History -
Law -
Medicine -
Philosophy -
Religious studies -