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Research Papers

Adaptation of the AnyBody™ Musculoskeletal Shoulder Model to the Nonconforming Total Shoulder Arthroplasty Context

[+] Author and Article Information
Lauranne Sins

Laboratoire de recherche
en imagerie et orthopédie,
Centre de recherche du CHUM,
Montréal, QC H2X 0A9, Canada;
École de technologie supérieure,
Montréal, QC H3C 1K3, Canada
e-mail: lauranne.sins@gmail.com

Patrice Tétreault

Orthopaedics Surgery Department,
Centre Hospitalier de l'Université de Montréal,
Notre-Dame Hospital,
Local DR-1118-16,
Montréal, QC H2L 4M1, Canada;
Laboratoire de recherche
en imagerie et orthopédie,
Centre de recherche du CHUM,
Montréal, QC H2X 0A9, Canada
e-mail: p.tetreault.md@gmail.com

Nicola Hagemeister

Department of GPA,
École de technologie supérieure,
Montréal, QC H3C 1K3, Canada;
Laboratoire de recherche
en imagerie et orthopédie,
Centre de recherche du CHUM,
Montréal, QC H2X 0A9, Canada
e-mail: nicola.hagemeister@etsmtl.ca

Natalia Nuño

Department of GPA,
École de technologie supérieure,
Montréal, QC H3C 1K3 Canada;
Laboratoire de recherche
en imagerie et orthopédie,
Centre de recherche du CHUM,
Montréal, QC H2X 0A9, Canada
e-mail: natalia.nuno@etsmtl.ca

Manuscript received July 29, 2014; final manuscript received July 18, 2015; published online September 2, 2015. Assoc. Editor: Guy M. Genin.

J Biomech Eng 137(10), 101006 (Sep 02, 2015) (7 pages) Paper No: BIO-14-1346; doi: 10.1115/1.4031330 History: Received July 29, 2014; Revised July 18, 2015

Current musculoskeletal inverse dynamics shoulder models have two limitations to use in the context of nonconforming total shoulder arthroplasty (NC-TSA). First, the ball and socket glenohumeral (GH) joint simplification avoids any humeral head translations. Second, there is no contact at the GH joint to compute the contact area and the center of pressure (COP) between the two components of NC-TSA. In this paper, we adapted the AnyBody™ shoulder model by introducing humeral head translations and contact between the two components of an NC-TSA. Abduction in the scapular plane was considered. The main objective of this study was to adapt the AnyBody™ shoulder model to a NC-TSA context and to compare the results of our model (translations, COP, contact area, GH joint reaction forces (GH-JRFs), and muscular forces) with previous numerical, experimental, and clinical studies. Humeral head translations and contact were successfully introduced in our adapted shoulder model with strong support for our findings by previous studies.

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References

Figures

Grahic Jump Location
Fig. 1

Views of the shoulder model. Deltoid muscle is constrained by an artificial rake (see bullets on deltoid muscle in all the three views). Glenoid component replaces the anatomic glenoid of the scapula (see coronal views); Humeral head component replaces the anatomic one in the humerus (see coronal, back, view). The configuration creates a 6.4 mm mismatch.

Grahic Jump Location
Fig. 2

Representation of the algorithms implemented in the NC-TSA model. The humeral head is represented by the dotted circle and the glenoid part by the solid line. The position of the two components represents a 30 deg of abduction. (a) Front view: representation of the FDK algorithm. αsIS and αsAP : translations in the IS and AP directions, respectively. FsIS and FsAP : FDK forces in the IS and AP directions, respectively. (b) Profile view: representation of the joint contact algorithm. Fc: contact force at each vertex in contact. F: total contact force for the whole contact area (eliptic surface in the superior, left part of panel (a)). kd: pressure modulus.

Grahic Jump Location
Fig. 3

Results of contact computation for five degrees of abduction (15 deg, 30 deg, 60 deg, 90 deg, and 120 deg): GH contact area with values of surface in cm2 (surface in white) and position of the COP of the humeral head on the glenoid component (crossed dot displayed in the white surface on the glenoid component)

Grahic Jump Location
Fig. 5

The three parts of deltoid (anterior, middle, posterior), supraspinatus, infraspinatus, subscapularis, and teres minor are represented, for the B&S model (dotted line) and the NC-TSA model (solid line)

Grahic Jump Location
Fig. 4

GH-JRF for the two models (B&S model and NC-TSA model) and comparison with other studies [1,10,11,13,42]

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