Popleteal angle was 45 degrees and Thomas was 30 degrees bilaterally. An abduction pillow has been applied post-operatively. The x-ray showed dramatical improvement of the subluxation and acetabular coverage. Dislocation of the hip occurs more frequently in the non-ambulatory patient with the spastic quadriplegia. It is rare in the hemiplegic.
Acetabular dysplasia is absent in early stages of dislocation.
Paralytic dislocation of the hip usually develops late in childhood at around five to seven years of age. The adductors, flexors, and medial hamstrings are relatively overactive compared with their antagonists. This leads to an adducted, flexed, internally rotated hip which tends to dislocate posteriorly. Secondary femoral antetorsion and acetabular insufficiency. Mental retardation, the retention of neonatal reflexes, and total involvement of the body indicates an increased likelihood of hip dislocation.