Application of Navigated Ultrasound for Assessment of the Anterior Pelvic Plane in Patients With Degenerative Hip Diseases

Abstract

Considering the noninvasiveness of the method and affordability of the hardware used in our system, it can be used in preoperative and postoperative measurements of pelvic orientation for supporting surgery planning and evaluation of treatment outcomes.

Preoperative Ultrasonographic Assessment of the Anterior Pelvic Plane for Personalized Total Hip Replacement

“…For the purpose of this work, the pelvic orientation measurements were conducted with a custom US system based on consumer‐grade mobile devices . The architecture of the system and the general measurement principal are shown in Figure .…”

“…Using the transducer, the operator visualizes the pelvic landmarks that define the anterior pelvic plane and marks their positions in the US image. These positions, together with the geometry of the US beam and the orientation of the transducer at the moment of acquisition, are used to compute the pelvic tilt angle . By convention, the measured angle is negative for anterior and positive for posterior pelvic rotation.…”

“…The method is based on ultrasonography (US), which has already proved to be an effective tool for musculoskeletal imaging. By tracking the location of the US transducer, it is possible to determine the absolute locations of the pelvic landmarks shown in the US image and, consequently, the orientation of the anterior pelvic plane with respect to the gravity vector . The second contribution is a concept of applying the preoperative measurements for intraoperative adjustment of the acetabular cup, without using navigation, by adjusting the tilt of the operating table.…”

The Effects of Body Position on Pelvic Tilt Angles Measured with a Smartphone-Based Navigated Ultrasound System in Symptom-Free Young Adults

“…The symphysis pubis was marked as a darker hypoechoic line between two bony structures. With the referenced 3D coordinates of APP and the internal orientation sensor of the mobile unit, PT is computed by the central unit application using algorithms that were presented in a previous publication [17]. The PT angle is calculated against the gravity vector (0 • ) in the upright position and against the horizontal vector (0 • ) in the supine position.…”

Intra‐ and Inter‐rater Reliability of Navigated Ultrasound in the Assessment of Pelvic Tilt in Symptom‐Free Young Adults

“…13 With the use of navigated ultrasound (US), it is possible to assess pelvic tilt individually, noninvasively, and in different body positions. 14,15 The technology used in this study could be applied in the near future as an important tool in pelvic tilt-adjusted acetabular cup alignment.…”