Figure 4

(A) A clear oval track image appeared on the fluoroscopy. (B) The starting point of the guide pin was located in the center of the oval track. (C) The projection of the guide pin became a point inside the oval track.
(A) A clear oval track image appeared on the fluoroscopy. (B) The starting point of the guide pin was located in the center of the oval track. (C) The projection of the guide pin became a point inside the oval track.