F Schmaranzer1, T D Lerch2, U Strasser3, P Vavron4, E Schmaranzer5, M Tannast6. 1. Department of Orthopaedic Surgery, Inselspital, Bern University Hospital, University of Bern, Freiburgstrasse, CH-3010 Bern, Switzerland. Electronic address: florian.schmaranzer@insel.ch. 2. Department of Orthopaedic Surgery, Inselspital, Bern University Hospital, University of Bern, Freiburgstrasse, CH-3010 Bern, Switzerland. Electronic address: till.lerch@insel.ch. 3. Pathologic Laboratory Dr. Obrist, Dr. Brunhuber OG, Zams, Austria. Electronic address: ulrich.strasser@tyrolpath.at. 4. Department of Orthopaedic Surgery, District Hospital St. Johann in Tyrol, Tyrol, Austria. Electronic address: vavron@khsj.at. 5. Department of Radiology, District Hospital St. Johann in Tyrol, Tyrol, Austria. Electronic address: schmaranzer@khsj.at. 6. Department of Orthopaedic Surgery, Inselspital, Bern University Hospital, University of Bern, Freiburgstrasse, CH-3010 Bern, Switzerland. Electronic address: moritz.tannast@insel.ch.
Abstract
RATIONALE AND OBJECTIVE: Although intra-articular bodies are a classic indication for MR arthrography and surgical removal, diagnostic studies are currently sparse. To assess the diagnostic performance of MR arthrography with and without leg traction in detection of intra-articular bodies in the hip joint. MATERIAL AND METHODS: The institutional hip arthroscopy data base (2009-2016: 631 hips) was retrospectively reviewed. Inclusion criteria were hips with and without intra-articular bodies and direct MR arthrography performed with and without leg traction. Twenty-one hips with intra-articular bodies constituted the "disease-positive" group. Seventy-nine randomly selected hips without intra-articular bodies constituted the "disease-negative" group. Images were reviewed independently for presence of intra-articular bodies by two blinded readers. Overall diagnosis and location of intra-articular bodies was recorded (peripheral or central). Arthroscopy served as goldstandard for diagnosis and location of intra-articular bodies. Diagnostic performance and kappa statistics of traction MR arthrography with and without traction were calculated. RESULTS: For both readers sensitivity/specificity of traction MR arthrography was 86%-95% respectively 90%-91% for overall diagnosis of intra-articular bodies and was 81%-86% respectively 90%-92%for MR arthrogrpahy without traction. For central intra-articular bodies sensitivity was higher for both readers with traction (79%-89%) than without traction (74% each). CONCLUSION: MR arthrography with and without traction of the hip is highly accurate in identifying central and peripheral intra-articular bodies. Application of traction was further useful for visualization of centrally located intra-articular bodies.
RATIONALE AND OBJECTIVE: Although intra-articular bodies are a classic indication for MR arthrography and surgical removal, diagnostic studies are currently sparse. To assess the diagnostic performance of MR arthrography with and without leg traction in detection of intra-articular bodies in the hip joint. MATERIAL AND METHODS: The institutional hip arthroscopy data base (2009-2016: 631 hips) was retrospectively reviewed. Inclusion criteria were hips with and without intra-articular bodies and direct MR arthrography performed with and without leg traction. Twenty-one hips with intra-articular bodies constituted the "disease-positive" group. Seventy-nine randomly selected hips without intra-articular bodies constituted the "disease-negative" group. Images were reviewed independently for presence of intra-articular bodies by two blinded readers. Overall diagnosis and location of intra-articular bodies was recorded (peripheral or central). Arthroscopy served as goldstandard for diagnosis and location of intra-articular bodies. Diagnostic performance and kappa statistics of traction MR arthrography with and without traction were calculated. RESULTS: For both readers sensitivity/specificity of traction MR arthrography was 86%-95% respectively 90%-91% for overall diagnosis of intra-articular bodies and was 81%-86% respectively 90%-92%for MR arthrogrpahy without traction. For central intra-articular bodies sensitivity was higher for both readers with traction (79%-89%) than without traction (74% each). CONCLUSION: MR arthrography with and without traction of the hip is highly accurate in identifying central and peripheral intra-articular bodies. Application of traction was further useful for visualization of centrally located intra-articular bodies.
Authors: Till D Lerch; Sébastien Zwingelstein; Florian Schmaranzer; Adam Boschung; Markus S Hanke; Inga A S Todorski; Simon D Steppacher; Nicolas Gerber; Guodong Zeng; Klaus A Siebenrock; Moritz Tannast Journal: Orthop J Sports Med Date: 2021-05-28
Authors: Guodong Zeng; Celia Degonda; Adam Boschung; Florian Schmaranzer; Nicolas Gerber; Klaus A Siebenrock; Simon D Steppacher; Moritz Tannast; Till D Lerch Journal: Orthop J Sports Med Date: 2021-11-24
Authors: Markus S Hanke; Till D Lerch; Florian Schmaranzer; Malin K Meier; Simon D Steppacher; Klaus A Siebenrock Journal: EFORT Open Rev Date: 2021-06-28