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Comparison between 2D and 3D computed tomography evaluation of glenoid bone defect in unilateral anterior gleno-humeral instability

Confronto tra ricostruzioni 2D e 3D nella valutazione mediante tomografia computerizzata del difetto osseo glenoideo nella instabilità gleno-omerale anteriore monolaterale

  • Musculoskeletal Radiology / Radiologia Muscoloscheletrica
  • Published:
La radiologia medica Aims and scope Submit manuscript

Abstract

Purpose

This study evaluated the agreement between 2D and 3D computed tomography (CT) measurements in identifying the size and type of glenoid-bone defect in anterior glenohumeral instability.

Materials and methods

One hundred patients affected by unilateral anterior glenohumeral instability underwent a CT of both shoulders. Images were processed with both 2D [multiplanar reconstruction (MPR)] and 3D [volumerendering (VR)] methods. The area of the missing glenoid was calculated in comparison with the healthy glenoid and expressed as a percentage. Agreement between the two measurements was assessed according to the Bland-Altman method; a 5% mean difference was considered as clinically relevant.

Results

Analysis of agreement between MPR and VR measurements of the percentage of missing glenoid showed a mean difference equal to 0.62%±1.96%. Percent agreement between the two measurements in detecting the presence of bone defect was 97% (p<0.0001). Percent agreement between the two measurements in discriminating the type of bone defect was 97% (p<0.0001).

Conclusions

Agreement between 2D (MPR) and 3D (VR) CT measurements to identify the size and type of glenoid-bone defect in anterior glenohumeral instability was so high that the two measurements can be considered interchangeable.

Riassunto

Obiettivo

Scopo del nostro lavoro è stato valutare la concordanza tra misurazioni bidimensionali (2D) e tridimensionali (3D) con tomografia computerizzata (TC) nella identificazione delle dimensioni e del tipo di difetto osseo di glena nell’instabilità gleno-omerale anteriore.

Materiali e metodi

Cento pazienti con instabilità glenoomerale anteriore monolaterale hanno eseguito esame TC delle spalle. Le immagini sono state riformate sia con il metodo 2D (multi-planar reconstruction, MPR) che 3D (volume rendering technique, VRT). L’area del difetto di glena è stata calcolata in confronto con la glena sana ed è stata espressa in percentuale. La concordanza tra le due misurazioni è stata valutata con il metodo Bland-Altman; una differenza media del 5% è stata considerata clinicamente significativa.

Risultati

L’analisi della concordanza tra le misurazioni MPR e VRT della percentuale di glena mancante ha mostrato una differenza media di 0,62%±1,96%. La concordanza percentuale tra le due misurazioni nel valutare la grandezza del difetto osseo è stata del 97% (p<0,0001). La concordanza percentuale nel discriminare il tipo di difetto osseo è stata del 97% (p<0,0001).

Conclusioni

La concordanza tra misurazioni TC 2D (MPR) e 3D (VRT) nell’identificare le dimensioni ed il tipo di difetto osseo di glena nell’instabilità glenoomerale anteriore è stata cosÌ alta da poterle considerare intercambiabili.

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Authors and Affiliations

  1. Dipartimento di Bioimmagini e Scienze Radiologiche, Università Cattolica del Sacro Cuore, Policlinico “A. Gemelli”, Largo A. Gemelli 8, 00168, Roma, Italy

    N. Magarelli, A. Leone, R. Amelia & L. Bonomo

  2. Dipartimento di Ortopedia e Traumatologia, Università Cattolica del Sacro Cuore, Policlinico “A.Gemelli”, Roma, Italy

    G. Milano, D. A. Santagada & C. Fabbriciani

  3. Dipartimento di Ortopedia, Ospedale “Ramazzini”, Carpi, Italy

    P. Baudi & V. Spina

  4. Dipartimento di Ortopedia, Ospedale “San Camillo”, Forte dei Marmi, Italy

    P. Righi

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  1. N. Magarelli
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  2. G. Milano
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  3. P. Baudi
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  4. D. A. Santagada
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  7. A. Leone
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  8. R. Amelia
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Correspondence to N. Magarelli.

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Magarelli, N., Milano, G., Baudi, P. et al. Comparison between 2D and 3D computed tomography evaluation of glenoid bone defect in unilateral anterior gleno-humeral instability. Radiol med 117, 102–111 (2012). https://doi.org/10.1007/s11547-011-0712-7

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  • DOI: https://doi.org/10.1007/s11547-011-0712-7

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