A
Standard hemispherical cementless cup with screws
B
Impaction bone grafting with a cemented cup
C
Jumbo porous-coated cup or cup-cage construct
D
Isolated polyethylene liner exchange
Explanation:The correct option is 'c'. Paprosky Type IIIA defects feature severe bone loss, 'up and out' migration (10-15mm), and a non-supportive Kohler's line (intact but thin). Standard cups fail to achieve stability. Reconstruction typically requires a jumbo cup (if >50% host bone contact is possible) or augments, cages, and cup-cage constructs to span the defect.
Reference: Paprosky WG, Perona PG, Lawrence JM. Acetabular defect classification and surgical reconstruction in revision arthroplasty. A 6-year follow-up evaluation. J Arthroplasty. 1994;9(1):33-44.