Test on Paprosky Classification for Acetabular Bone Loss

Question 1: The Paprosky classification assesses the status of acetabular supporting structures including the anterior and posterior columns, the superior weightbearing dome, and the medial wall.

A. Ano

B. Ne

Explanation: The study materials explicitly state, "The Paprosky system uses preoperative radiographs to classify defects by the amount of acetabular component migration and the status of the acetabular supporting structures including the anterior and posterior columns, the superior weightbearing dome, and the medial wall."

Question 2: The Paprosky classification recommends a "proximal femur arc" graft as a bone graft for Type 3A acetabular defects.

A. Ano

B. Ne

Explanation: According to Table 2, the Paprosky classification recommends 'Number 7 distal femur' and 'Bulk proximal tibia' as bone grafts for Type 3A defects. The 'Proximal femur arc' graft is recommended for Type 3B defects.

Question 3: According to the Paprosky classification of acetabular bone loss, which of the following statements correctly describe Type 2 defects?

A. They involve extensive global erosion of the acetabulum with destruction of all supporting structures.

B. They are characterized by moderate bone loss, deficient walls, and intact acetabular columns.

C. They are associated with hip center migration of less than 2 cm.

D. They have minimal focal bone loss with maintenance of the hemispheric shape of the acetabulum.

Explanation: Type 2 defects are described as having moderate bone loss, deficient walls but intact acetabular columns, and less than 2 cm of hip center migration. Extensive global erosion and destruction of all supporting structures is characteristic of Type 3 defects, while minimal focal bone loss with maintenance of hemispheric shape defines Type 1 defects.

Question 4: According to the Paprosky classification of acetabular bone loss, which type is characterized by extensive global erosion of the acetabulum with attenuation or destruction of all supporting structures?

A. Type 1

B. Type 2A

C. Type 3

D. Type 2C

Explanation: Type 3 defects are described as having extensive global erosion of the acetabulum with attenuation or destruction of all supporting structures and greater than 2 cm of hip center migration. Type 1 defects have minimal focal bone loss, and Type 2 defects have moderate bone loss.

Question 5: The Paprosky femoral deficiency classification system was developed to categorize acetabular defects in revision total hip arthroplasty.

A. Ano

B. Ne

Explanation: Valle CJ and Paprosky WG developed a "Classification and an algorithmic approach to the reconstruction of femoral deficiency in revision total hip arthroplasty," indicating it pertains to femoral deficiency, not acetabular defects.