1. Disassembly of the inner head of a bipolar hip prosthesis
Tsuyoshi Toyota, MD, Hiroshi Horiuchi, MD, PhD, Yoshiyuki Nakamura, MD, Ikuya Yamazaki, MD, Tsutomu Takizawa, MD, PhD 
Arthroplasty Today 
Volume 4, Issue 3, Pages (September 2018)
DOI: /j.artd
Copyright © 2018 The Authors Terms and Conditions

2. Figure 1
Anteroposterior radiograph film obtained immediately after implantation of the right bipolar hemiarthroplasty. There are no obvious abnormalities.
Arthroplasty Today 2018 4, DOI: ( /j.artd )
Copyright © 2018 The Authors Terms and Conditions

3. Figure 2
Displacement of the inner head from the neck of the stem. Sinking of the stem compared with the primary surgery was also observed.
Arthroplasty Today 2018 4, DOI: ( /j.artd )
Copyright © 2018 The Authors Terms and Conditions

4. Figure 3
Tomographic image and computed tomography scan. The inner head is displaced from the stem. There is a crack in the lesser trochanter, suggesting a fracture (arrow).
Arthroplasty Today 2018 4, DOI: ( /j.artd )
Copyright © 2018 The Authors Terms and Conditions

5. Figure 4
Intraoperative photograph. A fracture line (arrow) runs toward the lesser trochanter, and sinking of the stem is evident. (The inner head has been fitted into the stem neck for confirmation.)
Arthroplasty Today 2018 4, DOI: ( /j.artd )
Copyright © 2018 The Authors Terms and Conditions

6. Figure 5
Postoperative radiograph. Wiring of the fracture site was performed with Dall-Miles cable. Then, a new inner head and bipolar cup were fitted into the stem.
Arthroplasty Today 2018 4, DOI: ( /j.artd )
Copyright © 2018 The Authors Terms and Conditions