Fig. 1
From: Cup implantation accuracy using the HipCOMPASS mechanical intraoperative support device
The HipCOMPASS mechanical intraoperative angle guide device. The device has legs to be placed on the left and right anterior superior iliac spines (ASIS) and on the pubic symphysis. The width to the left and right ASIS and the height to the pubic symphysis are variable, and adjusted to each individual patient. The length of the leg placed on the pubis is also adjustable, allowing for the correction of angle errors caused by soft tissue. The left and right ASIS legs are hollow, and the device is fixed to these ASIS by the insertion of Kirschner wires through them from above. An angle indicator is placed on the device, and the cup is inserted parallel to the direction of the indicator, thereby increasing its accuracy