What is characterized by psoatic limp in Legg-Calvé-Perthes disease?

In Legg-Calvé-Perthes disease, the psoatic limp often occurs due to weakness in the psoas major muscle. This condition involves avascular necrosis of the femoral head, leading to hip joint pain and dysfunction during movement. The psoas major is a primary hip flexor and, when affected by the disease, contributes to altered gait patterns.

Patients may present with a limp that is characterized by hip flexion and external rotation during ambulation, resulting from the inability to properly stabilize the hip joint because of pain or weakness in the psoas muscle. This compensatory mechanism helps to reduce the pressure on the femoral head but leads to an atypical gait, which is termed the psoatic limp.

The other muscles listed, such as the quadriceps, gluteus medius, and hamstrings, have different roles and contributions to hip mechanics and gait stability but do not specifically contribute to the characteristic limp associated with Legg-Calvé-Perthes disease in the same way that weakness in the psoas major does.