At the NZ Shoulder & Elbow Society meeting
At the New Zealand Shoulder & Elbow Society Annual Scientific Meeting, presenting a paper on assessing glenoid bone loss in patients with shoulder instability.
Two further talks followed by invitation: one on operative exposure for reverse total shoulder arthroplasty, and one on preventing infection in total shoulder arthroplasty.
Measuring glenoid bone loss accurately is the practical basis for deciding between a soft tissue repair and a bone block procedure in an unstable shoulder, which is why it keeps recurring as a conference subject.
What glenoid bone loss means
The glenoid is the socket of the shoulder joint, a shallow dish on the outer edge of the shoulder blade. Its shallowness is what gives the shoulder its range of movement and also what makes it the joint most likely to dislocate. Each dislocation can chip or wear bone away from the front rim of that socket, and the socket becomes progressively easier to dislocate from as that bone disappears.
The reason it is measured is that it determines which operation is appropriate. Where the rim is largely intact, a soft tissue repair reattaching the torn labrum and ligaments to it may be enough. Where enough bone has been lost, a repair has less to anchor to, and a bone block procedure that restores the missing bone may be considered instead. Measurement is usually made from CT imaging, and because several methods exist and they do not always agree, the question continues to be studied. Any individual shoulder is assessed on its own examination and imaging. Individual results vary.
Reverse shoulder replacement and infection prevention
A reverse total shoulder replacement reverses the normal arrangement of the joint, placing the ball on the shoulder blade and the socket on the upper arm. That allows the deltoid muscle over the outside of the shoulder to lift the arm in situations where the rotator cuff tendons are torn beyond repair. Operative exposure refers to how the socket side is reached and made visible during the procedure, which is not straightforward because it sits deep and close to nerves, and the accuracy of component placement depends on it.
Infection around an implant is uncommon but serious, because bacteria on an implant surface are difficult to clear with antibiotics alone. Prevention is a sequence of measures running from patient preparation through skin preparation, antibiotic timing and theatre discipline to wound care afterwards. Individual results vary.