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Related Experiment Video

Updated: Jan 22, 2026

A Novel Arthroscopic Medial Knot-Tying Suture-Bridge Repair with Rip-Stop Technique for Rotator Cuff Tears
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A Novel Arthroscopic Medial Knot-Tying Suture-Bridge Repair with Rip-Stop Technique for Rotator Cuff Tears

Published on: January 13, 2026

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Shoulder complex kinematics pre- and post- rotator cuff repair.

Alyssa J Schnorenberg1, Margaret E French2, Justin M Riebe2

  • 1Department of Occupational Science and Technology, College of Health Sciences, University of Wisconsin-Milwaukee, Milwaukee, WI 53201, USA; Department of Biomedical Engineering, College of Engineering, Marquette University, Milwaukee, WI 53201, USA.

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
|July 21, 2019
PubMed
Summary

This study shows shoulder complex joint motion improves after rotator cuff repair, with gains continuing beyond 3 months. Clinicians should assess all shoulder joints for better rehabilitation outcomes.

Keywords:
BiomechanicsKinematicsRehabilitationRotator cuff repairShoulderSupraspinatus

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Area of Science:

  • Orthopedics
  • Biomechanics
  • Rehabilitation Science

Background:

  • Rotator cuff tears are common, impacting shoulder function.
  • Full-thickness supraspinatus tears often require surgical repair.
  • Understanding shoulder complex kinematics post-repair is crucial for recovery.

Purpose of the Study:

  • To investigate shoulder complex joint kinematics and functional outcomes after rotator cuff repair.
  • To compare joint motion and patient-reported outcomes at different post-operative time points.
  • To determine if thoracohumeral motion alone is sufficient for assessing recovery.

Main Methods:

  • Nine adults underwent motion analysis during a hair combing task.
  • Kinematics of glenohumeral, acromioclavicular, sternoclavicular, and thoracohumeral joints were measured using inverse kinematics.
  • UCLA Shoulder Rating and Simple Shoulder Test assessed functional outcomes pre- and post-operatively.

Main Results:

  • Significant improvements were observed in shoulder complex joint motion in coronal and transverse planes over time.
  • Thoracohumeral motion did not show significant increases, indicating its limitations as a sole assessment metric.
  • Greater kinematic improvements were noted at 6 months compared to 3 months post-surgery.

Conclusions:

  • Shoulder complex kinematics improve after rotator cuff repair, with continued progress beyond the typical 3-month rehabilitation endpoint.
  • Assessment should include all shoulder complex joints, not just thoracohumeral motion, for a comprehensive evaluation.
  • Longer-term kinematic data can inform improved rehabilitation strategies and patient outcomes.