1. Instructional Course Lectures, The American Academy of Orthopaedic Surgeons - Periprosthetic Fractures of the Acetabulum during and following Total Hip Arthroplasty*† by JOHN J. CALLAGHAN J Bone Joint Surg Am Volume 79(9):1416-21 September 1, 1997 ©1997 by The Journal of Bone and Joint Surgery, Inc.

2. Fig. 1 Patterns of acetabular fractures observed during the insertion of oversized acetabular components. JOHN J. CALLAGHAN J Bone Joint Surg Am 1997;79:1416- 21 ©1997 by The Journal of Bone and Joint Surgery, Inc.

3. Fig. 2-A A peripheral rim fracture (arrow) is demonstrated on one radiograph (Fig. 2-A) but not on the other (Fig. 2-B). JOHN J. CALLAGHAN J Bone Joint Surg Am 1997;79:1416- 21 ©1997 by The Journal of Bone and Joint Surgery, Inc.

4. Fig. 3 Load-deflection curves. JOHN J. CALLAGHAN J Bone Joint Surg Am 1997;79:1416- 21 ©1997 by The Journal of Bone and Joint Surgery, Inc.

5. Fig. 4 Graph representing the area of contact between the acetabular prosthesis and the bone, starting from the dome and proceeding to the periphery. JOHN J. CALLAGHAN J Bone Joint Surg Am 1997;79:1416- 21 ©1997 by The Journal of Bone and Joint Surgery, Inc.

6. Fig. 5 Schematic of the acetabular zones on the left side of a pelvis. JOHN J. CALLAGHAN J Bone Joint Surg Am 1997;79:1416- 21 ©1997 by The Journal of Bone and Joint Surgery, Inc.

7. Fig. 5-B Graphic representation of the screw pull-out data recorded in the zones shown in Fig. 5- A. JOHN J. CALLAGHAN J Bone Joint Surg Am 1997;79:1416- 21 ©1997 by The Journal of Bone and Joint Surgery, Inc.

8. Figs. 6-A through 6-D: A woman in whom an acetabular component was inserted without cement, with one millimeter of underreaming and screw augmentation, in osteopenic bone. JOHN J. CALLAGHAN J Bone Joint Surg Am 1997;79:1416- 21 ©1997 by The Journal of Bone and Joint Surgery, Inc.

9. Fig. 6-B: The immediate postoperative radiograph did not show a periprosthetic fracture. JOHN J. CALLAGHAN J Bone Joint Surg Am 1997;79:1416- 21 ©1997 by The Journal of Bone and Joint Surgery, Inc.

10. Fig. 6-C: At six weeks, the radiograph demonstrated a displaced healing periprosthetic fracture (arrow) and a displaced acetabular component. JOHN J. CALLAGHAN J Bone Joint Surg Am 1997;79:1416- 21 ©1997 by The Journal of Bone and Joint Surgery, Inc.

11. Fig. 6-D: At one year, the radiograph demonstrated no more change in the position of the acetabular component. JOHN J. CALLAGHAN J Bone Joint Surg Am 1997;79:1416- 21 ©1997 by The Journal of Bone and Joint Surgery, Inc.