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Ultrasound-based computer navigation: an accurate measurement tool for determining combined anteversion

Ultrasound-based computer navigation: an accurate measurement tool for determining combined anteversion
Ultrasound-based computer navigation: an accurate measurement tool for determining combined anteversion
Introduction: the present feasibility study examined the use of an ultrasound-based navigation system (UNS) for reliability of measurement the positions of both the femoral and acetabular components, a prerequisite to adjust the combined anteversion with sufficient accuracy when using a femur-first approach in total hip arthroplasty.

Method: using a UNS, five investigators performed five measurements of the posterior femoral condyles and the anterior pelvic planes (APP) of two cadavers with different body mass index. Deviations in stem and acetabular anteversion resulting from varying acquisition of the respective landmarks were determined relative to the reference measures of anteversion determined in the same cadavers from computed tomography (CT) scans. Here, both a freehand and guided ultrasound measurement methods were used to acquire the posterior femoral condyles. Femoral and acetabular anteversion values were added in order to estimate the combined anteversion of the reconstructed hip.

Results: using an UNS, variations in the freehand technique for the acquisition of the posterior femoral condyles resulted in a mean error in the anteversion of the femoral component of -1.5 degrees (SD 3.4 degrees ; -10.8 degrees to 7.0 degrees ) while the mean error was -0.9 degrees (SD 3.1 degrees ; -7.3 degrees to 10.2 degrees ) when the UNS provided additional support to standardize the orientation of the UNS probe. In all cases, UNS navigation enabled to achieve combined anteversion values that fell within a clinically acceptable error range of less than +/- 12.5 degrees compared to the CT measures.

Conclusion: our investigations suggest that the anteversion of stem and cup can be measured with accuracy sufficient enough to utilize the concept of combined anteversion using UNS. Hence, the advantage of utilizing UNS's in a femur-first approach is the ability to intraoperatively compensate for deviations from the targeted anteversion of the stem (which is often difficult to control) by adjusting the acetabular anteversion in the final step of the implantation. In doing so, the placement of the components follows the concept of combined anteversion. Avoiding extreme anteversion values of combined anteversion could be an important step towards reducing post-operative complications following total hip arthroplasty (THA)
535-543
Wassilew, G.I.
e86e682e-4e93-46d5-ac2b-ec61bacc28bc
Hasart, O.
c8a1885f-4196-44c5-b1bf-affa11b0b152
Heller, M.O.
3da19d2a-f34d-4ff1-8a34-9b5a7e695829
Perka, C.
075d2c0e-b277-4a76-8b14-548bce0bb133
Südhoff, I.
66fe0e39-0215-4ca9-a89c-14f12f249c9e
Janz, V.
db4fc5cb-b08e-4e96-b3ca-e37b42286ce6
Seeger, J.B.
25b53b87-1057-493b-ba93-583d5288b78d
König, C.
1d5d6617-571b-4b22-a1a2-083162035e7a
Wassilew, G.I.
e86e682e-4e93-46d5-ac2b-ec61bacc28bc
Hasart, O.
c8a1885f-4196-44c5-b1bf-affa11b0b152
Heller, M.O.
3da19d2a-f34d-4ff1-8a34-9b5a7e695829
Perka, C.
075d2c0e-b277-4a76-8b14-548bce0bb133
Südhoff, I.
66fe0e39-0215-4ca9-a89c-14f12f249c9e
Janz, V.
db4fc5cb-b08e-4e96-b3ca-e37b42286ce6
Seeger, J.B.
25b53b87-1057-493b-ba93-583d5288b78d
König, C.
1d5d6617-571b-4b22-a1a2-083162035e7a

Wassilew, G.I., Hasart, O., Heller, M.O., Perka, C., Südhoff, I., Janz, V., Seeger, J.B. and König, C. (2012) Ultrasound-based computer navigation: an accurate measurement tool for determining combined anteversion. Technology and Health Care, 20 (6), 535-543. (doi:10.3233/THC-2012-00699). (PMID:23187019)

Record type: Article

Abstract

Introduction: the present feasibility study examined the use of an ultrasound-based navigation system (UNS) for reliability of measurement the positions of both the femoral and acetabular components, a prerequisite to adjust the combined anteversion with sufficient accuracy when using a femur-first approach in total hip arthroplasty.

Method: using a UNS, five investigators performed five measurements of the posterior femoral condyles and the anterior pelvic planes (APP) of two cadavers with different body mass index. Deviations in stem and acetabular anteversion resulting from varying acquisition of the respective landmarks were determined relative to the reference measures of anteversion determined in the same cadavers from computed tomography (CT) scans. Here, both a freehand and guided ultrasound measurement methods were used to acquire the posterior femoral condyles. Femoral and acetabular anteversion values were added in order to estimate the combined anteversion of the reconstructed hip.

Results: using an UNS, variations in the freehand technique for the acquisition of the posterior femoral condyles resulted in a mean error in the anteversion of the femoral component of -1.5 degrees (SD 3.4 degrees ; -10.8 degrees to 7.0 degrees ) while the mean error was -0.9 degrees (SD 3.1 degrees ; -7.3 degrees to 10.2 degrees ) when the UNS provided additional support to standardize the orientation of the UNS probe. In all cases, UNS navigation enabled to achieve combined anteversion values that fell within a clinically acceptable error range of less than +/- 12.5 degrees compared to the CT measures.

Conclusion: our investigations suggest that the anteversion of stem and cup can be measured with accuracy sufficient enough to utilize the concept of combined anteversion using UNS. Hence, the advantage of utilizing UNS's in a femur-first approach is the ability to intraoperatively compensate for deviations from the targeted anteversion of the stem (which is often difficult to control) by adjusting the acetabular anteversion in the final step of the implantation. In doing so, the placement of the components follows the concept of combined anteversion. Avoiding extreme anteversion values of combined anteversion could be an important step towards reducing post-operative complications following total hip arthroplasty (THA)

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Published date: 2012
Organisations: Bioengineering Group

Identifiers

Local EPrints ID: 348542
URI: https://eprints.soton.ac.uk/id/eprint/348542
PURE UUID: 08224815-0518-45f4-8bcc-e5a8838ecaa2
ORCID for M.O. Heller: ORCID iD orcid.org/0000-0002-7879-1135

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Date deposited: 14 Feb 2013 09:36
Last modified: 20 Jul 2019 00:41

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