Does registration with distal points increase accuracy and precision for femoral stem placement in CT-based navigation assisted THA?

Toshihito Hiraiwa; Kunihiko Tokunaga

doi:10.29007/jkmp

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Does registration with distal points increase accuracy and precision for femoral stem placement in CT-based navigation assisted THA?

3 pages•Published: March 8, 2024

Toshihito Hiraiwa and Kunihiko Tokunaga

Abstract

Most CAOS for THA is used only for cup placement. Only Stryker Navigation provides real time
navigation for stem insertion, however, few surgeons use this system during stem insertion because its accuracy is believed to be low. We analyzed whether the additional reference points on distal femur improve the accuracy of stem placement. Sixty-three hips of 57 cases (13 males, 44 females, average age: 65.9 y.o.) were analyzed in the study. Proximal registration group (36 hips) were registered with 30 arbitrary points on proximal femur and distal registration group (27 hips) were registered with additional 4-8 points on the distal femoral condyle in addition to 30 arbitrary points on proximal femur. The differences (average ± standard deviation of absolute values) between the pre- and post-operative angles of stem anteversion were 3.7 ± 3.5°in the only proximal registration group, and 3.8 ± 3.1° in the distal addition group. The differences (average ± standard deviation of absolute values) between the pre- and intra-operative angles of stem anteversion were 3.6 ± 2.2° in the proximal registration group and 1.6 ± 1.7° in the distal registration group. Registration with additional distal reference points on femur did not improve accuracy and precision for stem placement. However, addition distal reference points provided intraoperative replication of preoperative planning. Future modifications are needed to improve accurately for stem insertion.

Keyphrases: CT-based navigation, registration, total hip arthroplasty

In: Joshua W Giles (editor). Proceedings of The 22nd Annual Meeting of the International Society for Computer Assisted Orthopaedic Surgery, vol 6, pages 56--58

Links:	https://easychair.org/publications/paper/FqBG
	https://doi.org/10.29007/jkmp

BibTeX entry

@inproceedings{CAOS2023:Does_registration_with_distal,
  author    = {Toshihito Hiraiwa and Kunihiko Tokunaga},
  title     = {Does registration with distal points increase accuracy and precision for femoral stem placement in CT-based navigation assisted THA?},
  booktitle = {Proceedings of The 22nd Annual Meeting of the International Society for Computer Assisted Orthopaedic Surgery},
  editor    = {Joshua W Giles},
  series    = {EPiC Series in Health Sciences},
  volume    = {6},
  pages     = {56--58},
  year      = {2024},
  publisher = {EasyChair},
  bibsource = {EasyChair, https://easychair.org},
  issn      = {2398-5305},
  url       = {https://easychair.org/publications/paper/FqBG},
  doi       = {10.29007/jkmp}}

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