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Journal of Bone and Joint Surgery - British Volume, Vol 90-B, Issue 9, 1256-1259.
doi: 10.1302/0301-620X.90B9.20612  
Copyright © 2008 by British Editorial Society of Bone and Joint Surgery
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Humeral head translation during glenohumeral abduction following computer-assisted shoulder hemiarthroplasty

A. E. Kedgley, MESc, PhD Candidate1; J. A. DeLude, MESc, Research Assistant1; D. S. Drosdowech, MD, FRCSC, Orthopaedic Surgeon1; J. A. Johnson, PEng, PhD, Professor of Engineering Bioengineering Research Laboratory1; and R. T. Bicknell, MD, MSc, FRCSC, Orthopaedic Surgeon Division of Orthopaedic Surgery2

1 Hand and Upper Limb Centre, St Joseph’s Health Care London, 268 Grosvenor Street, London, Ontario, Canada N6A 4L6.
2 Department of Surgery Kingston General Hospital, Nickle 3, 76 Stuart Street, Queen’s University, Kingston, Ontario, Canada K7L 2V7.

Correspondence should be sent to Dr R. T. Bicknell; e-mail: rtbickne{at}yahoo.ca

This study compared the effect of a computer-assisted and a traditional surgical technique on the kinematics of the glenohumeral joint during passive abduction after hemiarthroplasty of the shoulder for the treatment of fractures. We used seven pairs of fresh-frozen cadaver shoulders to create simulated four-part fractures of the proximal humerus, which were then reconstructed with hemiarthroplasty and reattachment of the tuberosities. The specimens were randomised, so that one from each pair was repaired using the computer-assisted technique, whereas a traditional hemiarthroplasty without navigation was performed in the contralateral shoulder. Kinematic data were obtained using an electromagnetic tracking device.

The traditional technique resulted in posterior and inferior translation of the humeral head. No statistical differences were observed before or after computer-assisted surgery.

Although it requires further improvement, the computer-assisted approach appears to allow glenohumeral kinematics to more closely replicate those of the native joint, potentially improving the function of the shoulder and extending the longevity of the prosthesis.






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Hip, Knee, Trauma, Upper limb, Foot & Ankle, Paediatrics, Oncology, Spine, Arthroplasty, General