Accuracy considerations in navigated cup placement for total hip arthroplasty

2007 ◽  
Vol 221 (7) ◽  
pp. 739-753 ◽  
Author(s):  
U Langlotz ◽  
P A Grützner ◽  
K Bernsmann ◽  
J H Kowal ◽  
M Tannast ◽  
...  
Keyword(s):  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Statistical Simulation ◽  
Learning Curves ◽  
Computer Assisted ◽  
Total Hip ◽  
Computer Assisted Orthopaedic Surgery ◽  
Testing Environments

Computer assisted orthopaedic surgery (CAOS) technology has recently been introduced to overcome problems resulting from acetabular component malpositioning in total hip arthroplasty. Available navigation modules can conceptually be categorized as computer tomography (CT) based, fluoroscopy based, or image-free. The current study presents a comprehensive accuracy analysis on the computer assisted placement accuracy of acetabular cups. It combines analyses using mathematical approaches, in vitro testing environments, and an in vivo clinical trial. A hybrid navigation approach combining image-free with fluoroscopic technology was chosen as the best compromise to CT-based systems. It introduces pointer-based digitization for easily assessable points and bi-planar fluoroscopy for deep-seated landmarks. From the in vitro data maximum deviations were found to be 3.6° for inclination and 3.8° for anteversion relative to a pre-defined test position. The maximum difference between intraoperatively calculated cup inclination and anteversion with the postoperatively measured position was 4° and 5°, respectively. These data coincide with worst cases scenario predictions applying a statistical simulation model. The proper use of navigation technology can reduce variability of cup placement well within the surgical safe zone. Surgeons have to concentrate on a variety of error sources during the procedure, which may explain the reported strong learning curves for CAOS technologies.

In-Vitro Investigation of a Noninvasive Referencing Technology for Computer-Assisted Total Hip Arthroplasty

Orthopedics ◽  
2010 ◽  
Author(s):  
Tobias Renkawitz ◽  
Sabine Gneiting ◽  
Jens Schaumburger ◽  
Michael Woerner ◽  
Hans-Robert Springorum ◽  
...  
Keyword(s):  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Computer Assisted ◽  
Total Hip ◽  
In Vitro Investigation

scholarly journals In vitro and in vivo evaluations of the fully porous Ti6Al4V acetabular cups fabricated by a sintering technique

RSC Advances ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 6724-6732 ◽  
Author(s):  
Ji Li ◽  
Wei Li ◽  
Zhongli Li ◽  
Yuxing Wang ◽  
Ruiling Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Total Hip Arthroplasty ◽  
Pore Size ◽  
Hip Arthroplasty ◽  
High Porosity ◽  
Total Hip ◽  
Large Pore ◽  
Large Pore Size

The fully porous Ti6Al4V cup fabricated by the sintered technique showed high porosity, large pore size with good mechanical properties. It may be effective in achieving in vivo stability after the total hip arthroplasty.

Femoral cement extraction in revision total hip arthroplasty – an in vitro study comparing computer-assisted freehand-navigated cement removal to conventional cement extraction

2015 ◽  
Vol 60 (6) ◽  
Author(s):  
Torsten Mumme ◽  
Max Julian Friedrich ◽  
Henrik Rode ◽  
Sascha Gravius ◽  
Stefan Andereya ◽  
...  
Keyword(s):  
Total Hip Arthroplasty ◽  
Conventional Method ◽  
Hip Arthroplasty ◽  
In Vitro Study ◽  
Computer Assisted ◽  
Measured Temperature ◽  
Time Saving ◽  
Total Hip ◽  
Cement Removal

AbstractRevision surgery of cemented femoral stems in total hip arthroplasty is gaining more and more importance, but cement removal in revision hip arthroplasty may be technically challenging. Conventional manual cement removal can be time consuming and be associated with complications such as cortical perforation, fracture, or bone loss. The aim of this study was to investigate the practicability of computer-navigated cement removal.In anThe mean time for cement removal was 29±5 min for the conventional method and 32±8 min for the freehand-navigated cement removal. Here, excepting the preparatory examinations, the navigated cement removal only took 13±5 min. The measured temperature during polymerization was 36±5°C and during navigated cement removal was 37±8°C. In the distal part of the femur, cement removal was more accurate with the conventional method compared to the navigated one.The freehand-navigated cement removal, with the exception of the preparatory examinations, is time saving compared to the conventional method. However, a potential for technical development especially for the milling device and accuracy exist.

scholarly journals Measurement of Intraoperative Range of Motion of Total Hip Arthroplasty Using an Inertial Measurement Unit Based Smart Trial System: an in Vitro Validation Experiment

10.29007/jmjj ◽  
2018 ◽  
Author(s):  
Hao Tang ◽  
Yixin Zhou ◽  
Baojun Mai ◽  
Binjie Zhu ◽  
Ping Chen ◽  
...  
Keyword(s):  
Total Hip Arthroplasty ◽  
Range Of Motion ◽  
Hip Arthroplasty ◽  
Inertial Measurement Unit ◽  
Measurement Unit ◽  
Computer Assisted ◽  
Inertial Measurement ◽  
Total Hip ◽  
Validation Experiment

Intraoperative detection of hip Range of Motion ( ROM ) is the basis for prediction of postoperative functional limits allowed for patients’ daily living. Although computer navigation system for Total Hip Arthroplasty ( THA ) has improved the accuracy of intraoperative ROM evaluation, it has not been able to gain popularity because of its complex and time-consuming procedures. We preliminarily developed a Inertial Measurement Unit based Hip Smart trial system ( IMUHS ) that is easy and simple to use. An in vitro validation experiment was conducted using radiopaque sawbones with imaging measurement method as the reference standard. The validity of measuring ROM in the three axes was as follows: 4.36±4.93°forflexion and extension, 1.75 ± 5.21°for adduction and abduction, and 6.42 ± 4.32°for internal and external rotation( p = 0.059 ~ 0.550 ). The ICC values of measuring ROM in all three axeswere 1.00. As measuring ROM is the basis for evaluating direction of impingement, subluxation and dislocation, the IMUHS is a promising development direction of THA computer assisted surgery.

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