Journal article
Accuracy of the glenohumeral subluxation index in nonpathologic shoulders.
- Jacxsens M Department of Orthopaedic Surgery, University Hospital Basel, Basel, Switzerland.
- Van Tongel A Department of Orthopaedic Surgery and Traumatology, Ghent University Hospital, Ghent, Belgium.
- Willemot LB Department of Orthopaedic Surgery and Traumatology, Ghent University Hospital, Ghent, Belgium.
- Mueller AM Department of Orthopaedic Surgery, University Hospital Basel, Basel, Switzerland.
- Valderrabano V Department of Orthopaedic Surgery, University Hospital Basel, Basel, Switzerland.
- De Wilde L Department of Orthopaedic Surgery and Traumatology, Ghent University Hospital, Ghent, Belgium. Electronic address: lieven.dewilde@uzgent.be.
- 2014-12-03
Published in:
- Journal of shoulder and elbow surgery. - 2015
3D CT scan
3D evaluation
3D reconstruction
glenohumeral subluxation
humeral subluxation index
subluxation index
Adolescent
Adult
Aged
Aged, 80 and over
Arthroplasty, Replacement
Glenoid Cavity
Humans
Humeral Head
Imaging, Three-Dimensional
Middle Aged
Observer Variation
Reproducibility of Results
Severity of Illness Index
Shoulder Dislocation
Shoulder Joint
Tomography, X-Ray Computed
Young Adult
English
BACKGROUND
Correction of posterior humeral subluxation, measured by the humeral subluxation index (HSI) according to Walch, is necessary in total shoulder arthroplasty to prevent early loosening. The 3-dimensional (3D) measurement of the shoulder is becoming well accepted and common practice as it overcomes positional errors to which 2-dimensional (2D) glenohumeral measurements are prone. The first objective was to describe the HSI in a nonpathologic population with the 2D HSI according to Walch and a newly described 3D HSI method. The second objective was to compare both measuring methods with each other.
METHODS
In 151 nonpathologic shoulders, the 2D HSI was measured on the midaxial computed tomography scan cut of the scapula. The 3D HSI, based on the native glenoid plane, was defined as [formula in text], in which X is the projection of the center of the humeral head to the anteroposterior axis of the glenoid fossa and R is the radius of the humeral head. Both measuring methods were compared with each other. Correlation was determined. Interobserver and intraobserver reliability of the 3D HSI was measured.
RESULTS
The mean 3D HSI (51.5% ± 2.7%) was significantly (P < .001) more posterior than the mean 2D HSI (48.7% ± 5.2%), with a mean difference of 2.9% ± 5.6%. No correlation was found between the 2D and 3D HSI. The interobserver and intraobserver reliability was excellent.
CONCLUSION
The 2D HSI seems to underestimate the humeral subluxation compared with a 3D reliable equivalent.
Correction of posterior humeral subluxation, measured by the humeral subluxation index (HSI) according to Walch, is necessary in total shoulder arthroplasty to prevent early loosening. The 3-dimensional (3D) measurement of the shoulder is becoming well accepted and common practice as it overcomes positional errors to which 2-dimensional (2D) glenohumeral measurements are prone. The first objective was to describe the HSI in a nonpathologic population with the 2D HSI according to Walch and a newly described 3D HSI method. The second objective was to compare both measuring methods with each other.
METHODS
In 151 nonpathologic shoulders, the 2D HSI was measured on the midaxial computed tomography scan cut of the scapula. The 3D HSI, based on the native glenoid plane, was defined as [formula in text], in which X is the projection of the center of the humeral head to the anteroposterior axis of the glenoid fossa and R is the radius of the humeral head. Both measuring methods were compared with each other. Correlation was determined. Interobserver and intraobserver reliability of the 3D HSI was measured.
RESULTS
The mean 3D HSI (51.5% ± 2.7%) was significantly (P < .001) more posterior than the mean 2D HSI (48.7% ± 5.2%), with a mean difference of 2.9% ± 5.6%. No correlation was found between the 2D and 3D HSI. The interobserver and intraobserver reliability was excellent.
CONCLUSION
The 2D HSI seems to underestimate the humeral subluxation compared with a 3D reliable equivalent.
- Language
-
- English
- Open access status
- closed
- Identifiers
-
- DOI 10.1016/j.jse.2014.07.021
- PMID 25441558
- Persistent URL
- https://folia.unifr.ch/global/documents/91933
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