**Question:** Windswept deformity is seen in which of the following?

A. Osteoarthritis
B. Osteoporosis
C. Osteonecrosis
D. Trauma-induced fractures

**Core Concept:** Windswept deformity is a clinical term describing a specific radiographic finding in conditions affecting the hip joint. It refers to an abnormally elevated and laterally displaced greater trochanter, which is characteristic of certain pathological states.

**Why the Correct Answer is Right:** Windswept deformity is typically observed in conditions characterized by avascular necrosis (ON) of the femoral head, such as in Cushing's disease, alcoholism, or steroid-induced osteoporosis. In these cases, the lack of blood supply leads to necrosis of the femoral head, causing the abnormal position of the greater trochanter.

**Why Each Wrong Option is Incorrect:**

A. Osteoarthritis: This term refers to degenerative joint disease affecting the entire joint, not specifically the greater trochanter's position. In osteoarthritis, the joint space narrows, and the joint surface becomes rough, but the greater trochanter remains in a normal position.

B. Osteoporosis: Osteoporosis is characterized by decreased bone mineral density and fragile bones, but the windswept deformity is not a typical radiographic finding in osteoporosis. Instead, common findings include vertebral compression fractures, bowed long bones, and widened intervertebral disc spaces.

C. Osteonecrosis: Although osteonecrosis can lead to windswept deformity, the correct answer is C (osteonecrosis) rather than A (osteonecrosis). Osteonecrosis refers to the condition causing the windswept deformity, while Cushing's disease and alcoholism are examples of conditions leading to osteonecrosis.

D. Trauma-induced fractures: While trauma can cause fractures and indirectly alter the position of the greater trochanter, the windswept deformity is a specific radiographic finding in the mentioned conditions, not in simple fractures.

**Clinical Pearl:** The windswept deformity is a crucial radiographic finding that should prompt a thorough evaluation for the underlying cause, such as Cushing's disease, alcoholism, or steroid-induced osteonecrosis, rather than the direct trauma.

**Core Concept:** The windswept deformity is a characteristic radiographic feature associated with conditions causing avascular necrosis (ON) of the femoral head, which is typically seen in Cushing's disease, alcoholism, or steroid-induced osteonecrosis. These conditions lead to a lack of blood supply to the femoral head, causing the abnormal positioning of the greater trochanter.

**Why the Correct Answer is C (Osteonecrosis):**

In osteonecrosis, the affected individual's bone marrow is deprived of blood supply, leading to the death of bone cells (osteocytes) and subsequent collapse of the bone tissue. This process causes the deformation and abnormal positioning of the greater trochanter, which is what the winds