In CDH, the hip and knees are held in a flexed position and gradually abducted a ‘click of entrance’ will be felt as the femoral head slips into the acetabulum from the position of the dislocation is known as:
The correct answer here is the Ortolani test. The Ortolani test is used to detect hip dislocation in infants. When the hip is flexed and abducted, the examiner applies upward pressure, and if a click is felt, it indicates the femoral head moving into the acetabulum. This is different from the Barlow test, which is used to detect instability when reducing the hip. The Barlow test involves adduction and downward pressure to check for dislocation.
Now, the other options—let's assume they are Barlow test, Galeazzi sign, and Trendelenburg test. The Barlow test is the opposite; it's for detecting dislocation rather than reduction. The Galeazzi sign is when one leg appears shorter due to hip dislocation, observed when the infant is supine. The Trendelenburg test assesses hip abductor strength, not for dislocation itself.
The clinical pearl here is that the Ortolani test is for detecting reducible dislocations, while the Barlow test checks for instability. It's crucial for medical students to remember these two tests and their purposes, as they are fundamental in the early diagnosis of DDH. Early detection is vital to prevent long-term complications like arthritis.
**Core Concept**
This question tests knowledge of clinical examination techniques for Developmental Dysplasia of the Hip (DDH), specifically the **Ortolani test**, which detects reducible hip dislocation in infants. The maneuver involves flexing and abducting the hip to assess for a "click" as the femoral head re-enters the acetabulum.
**Why the Correct Answer is Right**
The **Ortolani test** is performed by holding the infant’s hip and knee in flexion and gently abducting the hip while applying upward pressure. A "click of entrance" during abduction indicates the femoral head slipping into the acetabulum from a dislocated position. This test confirms **reducible dislocation** (subluxation) when the hip is unstable but can be repositioned. It is distinct from the **Barlow test**, which checks for irreducible dislocation by adduction and downward pressure.
**Why Each Wrong Option is Incorrect**
**Option A:** If labeled "Barlow test," it assesses for **irreducible dislocation** by adducting the hip and applying downward pressure. A "clunk" here indicates dislocation, not reduction.
**Option B:** If labeled "Galeazzi sign," it refers to apparent leg length discrepancy in DDH, observed when the infant is supine with hips and knees flexed. No abduction is involved.
**Option C:** If labeled "Trendelenburg test," it evaluates hip abductor strength, not for DDH detection. Performed by having the patient stand on one leg, it checks for pelvic drop