Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2024 Nov;144(11):4849-4856.
doi: 10.1007/s00402-024-05571-4. Epub 2024 Sep 30.

Accelerometer-based portable navigation system shows no superior accuracy over pelvic alignment guide for acetabular cup placement in total hip arthroplasty in lateral decubitus position

Masanori Okamoto  1 , Yasuhiko Takegami  2 , Yusuke Osawa  2 , Shinya Tanaka  2 , Tatsuya Nobori  3 , Shiro Imagama  2
Affiliations

Accelerometer-based portable navigation system shows no superior accuracy over pelvic alignment guide for acetabular cup placement in total hip arthroplasty in lateral decubitus position

Masanori Okamoto et al. Arch Orthop Trauma Surg. 2024 Nov.

Abstract

Background: Total hip arthroplasty (THA) using a portable navigation system (PNS) incurs costs per procedure. However, it does not require a large console. This study aimed to compare the accuracy of acetabular cup placement using a pelvic alignment guide (PAG) attached to the pelvis and an accelerometer-based PNS in THA performed in the lateral decubitus position.

Methods: We retrospectively analyzed 100 hips that underwent primary THA in the lateral decubitus position between July 2018 and January 2021. The PAG was used in 50 hips, whereas the PNS was used in the other 50. Cup placement accuracy was measured using postoperative computed tomography scans, comparing errors in inclination and anteversion angles. The surgical time, blood loss, and complications were recorded. The follow-up period was at least 2 years in all cases.

Results: The mean absolute error of the inclination angle was similar between the groups (the PAG group: 3.7° ± 2.3° [range, 0.0-9.0]; the PNS group: 3.7° ± 2.3° [range, 0.2-10.5], p = 0.705). The mean absolute error of the anteversion angle was significantly smaller in the PAG group than in the PNS group (3.0° ± 2.4° [range, 0.0-9.7] vs. 6.5° ± 4.8° [range, 0.3-17.3], p < 0.001). The PAG group had a higher proportion of hips within 5° and 10° of the target angle (64 vs. 42%, P = 0.028, and 100 vs. 74%, p < 0.001, respectively). The PNS group had six hips with anteversion errors of 15° or more. Surgical time and blood loss were lower in the PAG group. The PNS group had one dislocation, whereas the PAG group did not.

Conclusion: The accelerometer-based PNS did not demonstrate superior cup alignment accuracy compared to the PAG in THA performed in the lateral decubitus position. This finding informs surgeons that computer-assisted surgery is not necessarily superior to conventional THA using a PAG.

Keywords: Alignment guide; Computer-assisted surgery; Hip; Portable navigation systems; Total hip arthroplasty.

PubMed Disclaimer

Conflict of interest statement

Declarations. Conflict of interest: All authors declare that they have no conflicts of interest.

Similar articles

See all similar articles

Cited by

References

    1. Patil S, Bergula A, Chen PC, Colwell CW Jr., D’Lima DD (2003) Polyethylene wear and acetabular component orientation. J Bone Joint Surg Am 56–63. https://doi.org/10.2106/00004623-200300004-00007 . 85-A Suppl 4
    1. Biedermann R, Tonin A, Krismer M, Rachbauer F, Eibl G, Stöckl B (2005) Reducing the risk of dislocation after total hip arthroplasty: the effect of orientation of the acetabular component. J Bone Joint Surg Br 87(6):762–769. https://doi.org/10.1302/0301-620x.87b6.14745 - DOI - PubMed
    1. Digioia AM 3rd, Jaramaz B, Plakseychuk AY et al (2002) Comparison of a mechanical acetabular alignment guide with computer placement of the socket. J Arthroplasty 17(3):359–364 - DOI - PubMed
    1. Kanoh T, Hasegawa Y, Masui T, Yamaguchi J, Kawabe K, Ishiguro N (2010) Accurate acetabular component orientation after total hip arthroplasty using an acetabular alignment guide. J Arthroplasty 25:181–186. https://doi.org/10.1016/j.arth.2008.10.003 - DOI
    1. Domb BG, El Bitar YF, Sadik AY, Stake CE, Botser IB (2014) Comparison of robotic-assisted and conventional acetabular cup placement in tha: a matched-pair controlled study. Clin Orthop Relat Res 472:1329–1336. https://doi.org/10.1007/s11999-013-3253-7 - DOI

LinkOut - more resources