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. 2017 Jul-Aug;51(4):386–396. doi: 10.4103/ortho.IJOrtho_144_17

Figure 5.

Figure 5

X-ray pelvis with both hip joints and proximal 1/3rd of femur anteroposterior view showing the difference in position between teardrop and inferior extent of posterior acetabular rim. To size the acetabulum accurately in templating as well as to understand cup positioning, it's important to recognize the distance between the two