Objectives: Although conventional surgical instruments for the alignment and placement of shoulder prostheses are widely used, there is still much room for improvement with regards to placement accuracy. As an alternative to conventional surgical instruments and camera-based navigation systems, personalized templates have been promoted for accurate placement of dental implants, surgery of the pelvis [3, 5], total knee arthroplasty [5], and for placing pedicle screws for spinal fixation [1, 2,4, 7]. In the current study, this technique has been applied to create a personalized template for accurate placement of the glenoid component in total shoulder replacement. We will describe the design of the glenoid template is and present the results of a validation study using twenty cadaveric scapulae. Background: Joint replacement of the hip and the knee is a successful procedure for the treatment of rheumatoid arthritis, osteoarthrosis and trauma. In contrast, replacement of the shoulder joint is far less successful with regards to both prosthesis survival and improvement of shoulder function. In part, this is caused by the fact that the shoulder joint is a more complex construction than either the hip or knee joints and the field of view of the orthopaedic surgeon during surgery is very limited. Additionally, the scapula is able to move underneath the skin. In the current surgical procedure, it is impossible to record this motion of the scapula and for that reason it cannot be corrected. As a result, placement of the glenoid component is likely to be inaccurate [6].
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