True about CDH-a) Usually b/1b) Genu valgumc) Wadding gaitd) Shenton’s line brokene) Spine lordosis present
**Core Concept**
Congenital Dislocation of the Hip (CDH) is a condition where the femoral head is dislocated from the acetabulum due to anatomical or developmental abnormalities. This condition can lead to various secondary deformities and gait disturbances.
**Why the Correct Answer is Right**
The correct answer is related to the typical presentation of CDH. In CDH, the pelvis and lower limb structures are often affected, leading to characteristic deformities. Genu valgum, also known as "knock knees," is a common secondary deformity seen in CDH due to altered pelvic and femoral alignment. This deformity occurs as a result of the abnormal growth and development of the hip joint and surrounding bones.
**Why Each Wrong Option is Incorrect**
* **Option A:** Usually bilateral - While CDH can be bilateral, it is not always the case, and unilateral presentation is common.
* **Option B:** Genu valgum - This is the correct answer, as genu valgum is a common secondary deformity seen in CDH.
* **Option C:** Wadding gait - Wadding gait is more commonly associated with poliomyelitis or other conditions affecting the lower limbs, not CDH.
* **Option D:** Spine lordosis present - Spine lordosis is not a typical feature of CDH; in fact, these patients may have a reduced lumbar lordosis.
**Clinical Pearl / High-Yield Fact**
In CDH, the presence of a positive Ortolani sign (a palpable clunk when the dislocated femoral head is gently reduced into the acetabulum) or a positive Barlow test (a dislocation of the femoral head from the acetabulum when the hip is gently flexed and abducted) is highly suggestive of the condition.
**Correct Answer: B. Genu valgum**