Universität zu Köln

Ott, Nadine, Kahmann, Stephanie, Hackl, Michael, Uschok, Stephan, Mueller, Lars Peter and Wegmann, Kilian (2021). The effect of metaglene lateralization on joint mobility of reverse shoulder arthroplasty: A cadaveric biomechanical study. J. Orthop., 24. S. 9 - 15. AMSTERDAM: ELSEVIER. ISSN 0972-978X

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Abstract

Introduction: Lateralization of the metaglene reduces scapular notching or impingement. However, the effect on joint mobility remains unclear. With increased attention to reverse shoulder arthroplasty over the past years, the aim of this biomechanical study is to analyze the effect of metaglene lateralization on range of motion in reverse shoulder arthroplasty. Methods: Reverse shoulder arthroplasty (DeltaXtend; Fa. Depuy/Synthes) was performed in 7 cadaveric shoulders. Lateralization of the metaglene was performed in increments, using spacers of +0 mm (subgroup I), +5 mm (subgroup II), +10 mm (subgroup III). Deltoid muscle (pars clavicularis, acromialis and spinalis), teres minor (TMI), infraspinatus (IF) and subscapularis muslces (SSC) were loaded separately. Range of motion was measured by using a motion capture system (Optotrak Certus) in the sagittal plane (z-axis), coronar plane (x-axis) and transversal plane (y-axis). A custom-made biomechanical test set up was used to test the samples with a constant preload with additional testing load up to 4 kg on each muscle. Results: Specimens showed a tendency towards increased range of motion in abduction (deltoid, pars acromialis), external rotation (IS/TMI) and internal rotation (SSC) in subgroup II, compared to subgroups I and III, without reaching the level of significance Abduction at maximum used load was 46 degrees (subgroup I), 62 degrees (subgroup II) and 22 degrees (subgroup III). The mean external rotation (ISF) at maximum used load was 25 degrees (I), 28 degrees (II) and 24 degrees (III). Mean internal rotation was 22 degrees (subgroup I), 48 degrees (subgroup II) and 26 degrees (subgroup III). Conclusion: Moderate lateralization of the glenosphere of +5 mm has improved the range of motion in our experimental cadaveric setup. Especially a higher internal and external rotation can be reached with less load.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Ott, Nadine UNSPECIFIED UNSPECIFIED UNSPECIFIED Kahmann, Stephanie UNSPECIFIED UNSPECIFIED UNSPECIFIED Hackl, Michael UNSPECIFIED UNSPECIFIED UNSPECIFIED Uschok, Stephan UNSPECIFIED UNSPECIFIED UNSPECIFIED Mueller, Lars Peter UNSPECIFIED UNSPECIFIED UNSPECIFIED Wegmann, Kilian UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-565181
DOI:	10.1016/j.jor.2021.02.016
Journal or Publication Title:	J. Orthop.
Volume:	24
Page Range:	S. 9 - 15
Date:	2021
Publisher:	ELSEVIER
Place of Publication:	AMSTERDAM
ISSN:	0972-978X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ROTATION; COMPLICATIONS; STABILITY; COMPONENT; DESIGN; CUFF Multiple languages Orthopedics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/56518