In vivo estimation of the glenohumeral joint rotation center from scapular bony landmarks by linear regression

C.G.M. Meskers, F.C.T. van der Helm, L.A. Rozendaal, P. M. Rozing

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Abstract

In this paper, a method is described for in vivo prediction of the glenohumeral joint rotation center (GH-r), necessary for the construction of a humerus local coordinate system in shoulder kinematic studies. The three-dimensional positions of five scapula bony landmarks as well as a large number of data points on the surface of the glenoid and humeral head were collected at 36 sets of cadaver scapulae and adjacent humeri. The position of GH-r in each scapula was estimated by mathematically fitting spheres to the glenoid and humeral head. GH-r prediction from scapula geometry parameters by linear regression resulted in a RMSE between measured and predicted GH-r of 2.32 mm for the x-coordinate, 2.69 mm for the y-coordinate and 3.04 mm for the z-coordinate. Application in vivo revealed a random humerus orientation error due to measurement inaccuracies of 1.35, 0.29 and 1.26°standard deviation per rotation angle. The estimated total humerus orientation error including the offset error due to the regression model inaccuracy was 2.86, 0.84 and 2.69°standard deviation. As these errors were about 15 and 20% of, respectively, the intra- and inter-subject variability of the humerus orientations measured, it is concluded that the method described in this paper allows for an adequate construction of a humerus local coordinate system.

Original languageEnglish
Pages (from-to)93-96
Number of pages4
JournalJournal of Biomechanics
Volume31
Issue number1
DOIs
Publication statusPublished - 1998

Keywords

  • Bony landmarks
  • Glenohumeral joint
  • Linear regression
  • Rotation center
  • Shoulder kinematics

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