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BMC Musculoskeletal Disorders
Published in: BMC Musculoskeletal Disorders 1/2016

Open Access 01-12-2016 | Research article

The effect of the rotator interval on glenohumeral kinematics during abduction

Authors: Babak Haghpanah, Kempland C. Walley, Andreas Hingsammer, Ethan R. Harlow, Ramin Oftadeh, Ashkan Vaziri, Arun J. Ramappa, Joseph P. DeAngelis, Ara Nazarian

Published in: BMC Musculoskeletal Disorders | Issue 1/2016

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Abstract

Background

The rotator interval (RI) has been exploited as a potentially benign point of entry into the glenohumeral (GH) joint. Bounded by the supraspinatus, subscapularis and coracoid process of the scapula, the RI is believed to be important in the shoulder’s soft tissue balancing and function. However, the role of the RI in shoulder kinematics is not fully understood. The purpose of this study is to describe the effect of the RI on GH motion during abduction of the arm.

Methods

Six shoulders from three cadaveric torsos were studied to assess the impact of changes in the RI during abduction under four conditions: Intact (Baseline), Opened, Repaired (repaired with side-to-side tissue approximation, no overlap) and Tightened (repaired with 1 cm overlap). For each group, the GH translation and area under the Curve (AUC) were measured during abduction using an intact cadaveric shoulder (intact torso).

Results

GH kinematics varied in response to each intervention and throughout the entire abduction arc. Opening the RI caused a significant change in GH translation. The Repair and Tightened groups behaved similarly along all axes of GH motion.

Conclusions

The RI is central to normal GH kinematics. Any insult to the tissue’s integrity alters the shoulder’s motion throughout abduction. In this model, closing the RI side-to-side has the same effect as tightening the RI. Since suture closure may offer the same benefit as tightening the RI, clinicians should consider this effect when treating patients with shoulder laxity. This investigation provides an improved perspective on the role of the RI on GH kinematics during abduction. When managing shoulder pathology, surgeons should consider how these different methods of RI closure affect the joint’s motion. In different circumstances, the surgical approach to the RI can be tailored to address each patient’s specific needs.
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Metadata
Title
The effect of the rotator interval on glenohumeral kinematics during abduction
Authors
Babak Haghpanah
Kempland C. Walley
Andreas Hingsammer
Ethan R. Harlow
Ramin Oftadeh
Ashkan Vaziri
Arun J. Ramappa
Joseph P. DeAngelis
Ara Nazarian
Publication date
01-12-2016
Publisher
BioMed Central
Published in
BMC Musculoskeletal Disorders / Issue 1/2016
Electronic ISSN: 1471-2474
DOI
https://doi.org/10.1186/s12891-016-0898-x

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