Most commonly involved bone in Paget’s disease
**Core Concept**
Paget's disease is a chronic skeletal disorder characterized by abnormal bone remodeling, leading to deformities and increased risk of fractures. The disease involves the replacement of normal bone tissue with disorganized and weakened bone, resulting in an increased risk of osteosarcoma. The pathophysiology of Paget's disease involves the imbalance between bone resorption and bone formation.
**Why the Correct Answer is Right**
The most commonly involved bone in Paget's disease is the pelvis, particularly the ilium. This is due to the high mechanical stress and load-bearing capacity of the pelvic bones, making them more susceptible to the abnormal bone remodeling characteristic of Paget's disease. The ilium is also a common site for osteosarcoma in patients with Paget's disease.
**Why Each Wrong Option is Incorrect**
**Option A:** The femur is also commonly involved in Paget's disease, but it is not the most commonly affected bone. While the femur is a weight-bearing bone, the ilium is more frequently involved.
**Option B:** The skull is a common site for Paget's disease, but it is not the most commonly affected bone. The skull is more frequently involved in the later stages of the disease.
**Option C:** The tibia is a weight-bearing bone, but it is not as commonly involved in Paget's disease as the pelvis. The tibia may be involved in the disease, but it is not the most commonly affected bone.
**Clinical Pearl / High-Yield Fact**
It is essential to remember that Paget's disease can lead to an increased risk of osteosarcoma, particularly in the pelvis and femur. A high index of suspicion is necessary for early detection and treatment of osteosarcoma in patients with Paget's disease.
**Correct Answer: C. The tibia is a weight-bearing bone, but it is not as commonly involved in Paget's disease as the pelvis. The tibia may be involved in the disease, but it is not the most commonly affected bone.