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Related Concept Videos

Muscles that Move the Arm01:31

Muscles that Move the Arm

Nine muscles are involved in arm movements. Two of these, the pectoralis major and latissimus dorsi, originate from the axial skeleton and are called axial muscles. The other seven originate from the scapula and are called the scapular muscles.
The pectoralis major has two origins. Its clavicular head originates on the medial half of the clavicle. In contrast, the sternocostal head originates on the costal cartilages of ribs 1-6, the sternum, and the aponeurosis of the external oblique of the...

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Related Experiment Video

Updated: Jul 6, 2026

Arthroscopic Management of Massive Irreparable Rotator Cuff Tears: Whole Rotator Cable Reconstruction Using Proximal Biceps Tendon Autograft
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Relationship between coracoacromial arch and rotator cuff analysed by a computer-assisted method.

Daniela Casino1, Danilo Bruni, Stefano Zaffagnini

  • 1Laboratorio di Biomeccanica, Istituti Ortopedici Rizzoli, Bologna, Italy. d.casino@biomec.ior.it

The International Journal of Medical Robotics + Computer Assisted Surgery : MRCAS
|March 15, 2008
PubMed
Summary

This study introduces a computer-assisted method to analyze shoulder impingement. The technique accurately measures rotator cuff and coracoacromial arch interactions, aiding surgical planning.

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Area of Science:

  • Orthopedics
  • Biomechanics
  • Medical Imaging

Background:

  • Subacromial impingement is a common shoulder condition.
  • Understanding the mechanism requires precise anatomical and kinematic data.
  • Current methods may lack accuracy in dynamic assessment.

Purpose of the Study:

  • To describe and assess the feasibility of a computer-assisted method for investigating shoulder impingement.
  • To quantify the relationship between rotator cuff muscles and the coracoacromial arch during shoulder movement.

Main Methods:

  • Utilized a surface tracker to record passive shoulder movements in four cadavers.
  • Employed dedicated software for data elaboration and analysis.
  • Measured distances between rotator cuff insertions (infraspinatus, supraspinatus) and the coracoacromial (CA) arch.

Main Results:

  • Identified specific angles of abduction and elevation where minimal distances occur between rotator cuff tendons and the CA arch.
  • Demonstrated repeatable kinematic data (ICC >= 0.90).
  • Obtained numerical anatomical data comparable to existing literature, providing individual shoulder joint measurements.

Conclusions:

  • The computer-assisted method is feasible and provides reliable data.
  • Preliminary results support extending this methodology for in vivo applications.
  • Potential application in computer-assisted arthroscopic surgery for shoulder impingement.