Accuracy of Mechanical Cup Alignment Device based on Functional Pelvic Plane in DAA-THA with Supine Position

3 pages•Published: July 12, 2018

Satoshi Nakasone, Masato Ishihara, Hiroyuki Taira, Mika Takaesu, Shuko Chinen, Yoshihide Miyata and Fuminori Kanaya

Abstract

Pelvic rotation during cup impaction causes excessive cup anteversion should be considered in direct anterior approach or anterior lateral approach total hip arthroplasty (THA) with supine position. There are two intraoperative support mechanical devices for THAs in supine position, one is based on functional pelvic plane (FPP) and the other is based on anatomical pelvic plane (APP). The purpose of this study was to compare the accuracy of two mechanical devices based on FPP or APP in THA with supine position.
The subjects of this study were 90 hips of 80 patients who underwent DAA-THA in a supine position using HipPointer® based on FPP (Pointer group). The other subjects of this study were 29 hips of 27 patients using HipCOMPASS® (Lexi, Tokyo) based on APP (COMPASS group). There are no significant differences in age, gender and BMI between the two groups.
Cup inclination and anteversion angle in Pointer group and COMPASS group were 40.2° (33-48°), 40.7° (33-47°), and 16.5° (9-26°), 17.5° (10-27°), respectively. There are no significant differences in cup inclination and anteversion angle between Pointer group and COMPASS group. Nor were there any significant differences in the absolute value errors for cup inclination and anteversion angle (inclination angle; 2.5°±2.1 vs 2.4° ±2.0、P=0.45) (Anteversion; 2.7°±2.4 vs 3.0°±2.0、P=0.23).
New developed mechanical navigation device based on intraoperative FPP by correction of axially rotated pelvis to surgical bed plane in the DAA-THA is an simple and useful device which accuracy of cup alignment didn’t show significant differences compared with the device based on intraoperative APP with reference of pubic symphysis.

Keyphrases: cup alignment accuracy, direct anterior approach tha, surgical assisted device

In: Wei Tian and Ferdinando Rodriguez Y Baena (editors). CAOS 2018. The 18th Annual Meeting of the International Society for Computer Assisted Orthopaedic Surgery, vol 2, pages 139-141.

Links:	https://easychair.org/publications/paper/nmhr
	https://doi.org/10.29007/bwwf

BibTeX entry

@inproceedings{CAOS2018:Accuracy_Mechanical_Cup_Alignment,
  author    = {Satoshi Nakasone and Masato Ishihara and Hiroyuki Taira and Mika Takaesu and Shuko Chinen and Yoshihide Miyata and Fuminori Kanaya},
  title     = {Accuracy of Mechanical Cup Alignment Device based on Functional Pelvic Plane in DAA-THA with Supine Position},
  booktitle = {CAOS 2018. The 18th Annual Meeting of the International Society for Computer Assisted Orthopaedic Surgery},
  editor    = {Wei Tian and Ferdinando Rodriguez Y Baena},
  series    = {EPiC Series in Health Sciences},
  volume    = {2},
  publisher = {EasyChair},
  bibsource = {EasyChair, https://easychair.org},
  issn      = {2398-5305},
  url       = {/publications/paper/nmhr},
  doi       = {10.29007/bwwf},
  pages     = {139-141},
  year      = {2018}}

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