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Validation of gait analysis with dynamic radiostereometric analysis (RSA) in patients operated with total hip arthroplasty
Author(s) -
Zügner Roland,
Tranberg Roy,
Lisovskaja Vera,
Shareghi Bita,
Kärrholm Johan
Publication year - 2017
Publication title -
journal of orthopaedic research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.041
H-Index - 155
eISSN - 1554-527X
pISSN - 0736-0266
DOI - 10.1002/jor.23415
Subject(s) - hip flexion , total hip arthroplasty , cluster (spacecraft) , gait , rotation (mathematics) , medicine , correlation , gait analysis , orthodontics , range of motion , computer science , physical medicine and rehabilitation , mathematics , surgery , artificial intelligence , geometry , programming language
We simultaneously examined 14 patients with OTS and dynamic radiostereometric analysis (RSA) to evaluate the accuracy of both skin‐ and a cluster‐marker models. The mean differences between the OTS and RSA system in hip flexion, abduction, and rotation varied up to 9.5° for the skin‐marker and up to 11.3° for the cluster‐marker models, respectively. Both models tended to underestimate the amount of flexion and abduction, but a significant systematic difference between the marker and RSA evaluations could only be established for recordings of hip abduction using cluster markers ( p = 0.04). The intra‐class correlation coefficient (ICC) was 0.7 or higher during flexion for both models and during abduction using skin markers, but decreased to 0.5–0.6 when abduction motion was studied with cluster markers. During active hip rotation, the two marker models tended to deviate from the RSA recordings in different ways with poor correlations at the end of the motion (ICC ≤0.4). During active hip motions soft tissue displacements occasionally induced considerable differences when compared to skeletal motions. The best correlation between RSA recordings and the skin‐ and cluster‐marker model was found for studies of hip flexion and abduction with the skin‐marker model. Studies of hip abduction with use of cluster markers were associated with a constant underestimation of the motion. Recordings of skeletal motions with use of skin or cluster markers during hip rotation were associated with high mean errors amounting up to about 10° at certain positions. © 2016 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 35:1515–1522, 2017.