The validity of a novel radiological method for measuring femoral stem version on anteroposterior radiographs of the hip after total hip arthroplasty

The Bone & Joint Journal
Markus WeberT Renkawitz

Abstract

Femoral stem version has a major influence on impingement and early post-operative stability after total hip arthroplasty (THA). The main objective of this study was to evaluate the validity of a novel radiological method for measuring stem version. Anteroposterior (AP) radiographs and three-dimensional CT scans were obtained for 115 patients (female/male 63/72, mean age 62.5 years (50 to 75)) who had undergone minimally invasive, cementless THA. Stem version was calculated from the AP hip radiograph by rotation-based change in the projected prosthetic neck-shaft (NSA*) angle using the mathematical formula ST = arcos [tan (NSA*) / tan (135)]. We used two independent observers who repeated the analysis after a six-week interval. Radiological measurements were compared with 3D-CT measurements by an independent, blinded external institute. We found a mean difference of 1.2° (sd 6.2) between radiological and 3D-CT measurements of stem version. The correlation between the mean radiological and 3D-CT stem torsion was r = 0.88 (p < 0.001). The intra- (intraclass correlation coefficient ≥ 0.94) and inter-observer agreement (mean concordance correlation coefficient = 0.87) for the radiological measurements were excellent. We found that ...Continue Reading

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Citations

Dec 24, 2015·Skeletal Radiology·Christoph Kolja BoesePhilipp Lechler
Oct 23, 2015·The Journal of Arthroplasty·Eduardo García-Rey, Eduardo García-Cimbrelo
Aug 15, 2015·The Journal of Arthroplasty·Christoph K BoeseStefan Budde
Aug 26, 2015·Skeletal Radiology·Christoph Kolja BoesePhilipp Lechler
Jul 2, 2015·International Orthopaedics·Benjamin BueckingPhilipp Lechler
Mar 25, 2008·Medical Engineering & Physics·Brian Derbyshire
Dec 13, 2006·The Journal of Arthroplasty·Shu SaitoKaichiro Saigo
Dec 3, 2016·The Bone & Joint Journal·F S Haddad
Feb 21, 2016·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Markus WeberTobias Renkawitz
Oct 8, 2016·International Journal of Computer Assisted Radiology and Surgery·T SchwarzB Craiovan
Apr 30, 2017·The Bone & Joint Journal·F S Haddad
Sep 24, 2015·Bone & Joint Research·D F HamiltonA H R W Simpson
Nov 18, 2021·The Journal of Bone and Joint Surgery. American Volume·Young-Kyun LeeKyung-Hoi Koo

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