Patients with bilateral CDH walk with the following gait-
**Core Concept**
The question is testing the understanding of the gait pattern in patients with bilateral Congenital Dislocation of the Hip (CDH). CDH, also known as Developmental Dysplasia of the Hip (DDH), is a condition where the hip joint is not properly formed, leading to instability and dislocation of the femoral head from the acetabulum. The gait pattern in patients with bilateral CDH is often characterized by a specific abnormality.
**Why the Correct Answer is Right**
Patients with bilateral CDH typically walk with a **Trendelenburg gait**. This gait pattern is characterized by a limp on the side of the affected hip, where the pelvis tilts downward on the unaffected side due to the weakness of the hip abductors. The Trendelenburg sign, which is a clinical test for hip abductor weakness, is often positive in patients with bilateral CDH. The hip abductors, primarily the gluteus medius and gluteus minimus muscles, play a crucial role in stabilizing the pelvis during gait. In bilateral CDH, the abnormal hip joint mechanics lead to weakness and atrophy of these muscles, resulting in the characteristic Trendelenburg gait.
**Why Each Wrong Option is Incorrect**
**Option A:** **Waddling gait** is often seen in patients with neuromuscular disorders, such as muscular dystrophy, and is characterized by a wide-based gait with a tendency to fall forward. This is not a typical gait pattern in patients with bilateral CDH.
**Option B:** **Spastic gait** is often seen in patients with cerebral palsy and is characterized by a stiff, short-strided gait. This is not a typical gait pattern in patients with bilateral CDH.
**Option C:** **Steppage gait** is often seen in patients with peripheral neuropathy and is characterized by a high-stepping gait due to foot drop. This is not a typical gait pattern in patients with bilateral CDH.
**Clinical Pearl / High-Yield Fact**
The Trendelenburg sign is a useful clinical test for assessing hip abductor weakness, which is often seen in patients with bilateral CDH. A positive Trendelenburg sign, where the pelvis tilts downward on the unaffected side when the patient stands on one leg, is a strong indication of hip abductor weakness.
**Correct Answer: C. Steppage gait is often seen in patients with peripheral neuropathy and is characterized by a high-stepping gait due to foot drop.