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Glenosphere disengagement: a potentially serious default in reverse shoulder surgery

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Abstract
Implant failure is a serious complication in reverse shoulder arthroplasty. We determined the incidence of glenosphere disengagement in a cohort of 479 reverse shoulder prostheses (468 Delta III (TM) [DePuy International Ltd, Leeds, UK], 11 Aequalis (TM) [Tornier, Grenoble, France]). We also determined whether disengagement adversely affected clinical outcomes. The minimum followup was 12 months (mean, 28.6 months; range, 12-72 months). Disengagement of the glenosphere occurred in 16 of 479 shoulders (3.2%). In 13 patients, the disengagement was partial (clear step-off between the baseplate and the glenosphere) and was not associated with a poor functional outcome with this short-term followup. In three patients, the disengagement led to a fracture of the central screw, leading to a complete disengagement of the glenosphere from the baseplate, necessitating revision in two; the third refused revision. Partial disengagement was seen in five of 11 Aequalis (TM) prostheses (45.4%) and eight of 468 Delta III (TM) prostheses (1.7%). The three total disengagements with central screw breakage all occurred in Delta III (TM) prostheses. We believe differences in the type of locking screws may explain the differences observed between the two types of reverse prostheses.
Keywords
REPLACEMENT, COMPLICATIONS, RUPTURE, DESIGN, TEAR, REVERSE PROSTHESIS, ROTATOR CUFF DYSFUNCTION, RHEUMATOID-ARTHRITIS, FUNCTIONAL RECOVERY, TOTAL SHOULDER ARTHROPLASTY

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Citation

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Chicago
MIDDERNACHT, BART, Lieven De Wilde, Daniel Molé, Luc Favard, and Philippe Debeer. 2008. “Glenosphere Disengagement: a Potentially Serious Default in Reverse Shoulder Surgery.” Clinical Orthopaedics and Related Research 466 (4): 892–898.
APA
MIDDERNACHT, B., De Wilde, L., Molé, D., Favard, L., & Debeer, P. (2008). Glenosphere disengagement: a potentially serious default in reverse shoulder surgery. CLINICAL ORTHOPAEDICS AND RELATED RESEARCH, 466(4), 892–898.
Vancouver
1.
MIDDERNACHT B, De Wilde L, Molé D, Favard L, Debeer P. Glenosphere disengagement: a potentially serious default in reverse shoulder surgery. CLINICAL ORTHOPAEDICS AND RELATED RESEARCH. 2008;466(4):892–8.
MLA
MIDDERNACHT, BART, Lieven De Wilde, Daniel Molé, et al. “Glenosphere Disengagement: a Potentially Serious Default in Reverse Shoulder Surgery.” CLINICAL ORTHOPAEDICS AND RELATED RESEARCH 466.4 (2008): 892–898. Print.
@article{434072,
  abstract     = {Implant failure is a serious complication in reverse shoulder arthroplasty. We determined the incidence of glenosphere disengagement in a cohort of 479 reverse shoulder prostheses (468 Delta III (TM) [DePuy International Ltd, Leeds, UK], 11 Aequalis (TM) [Tornier, Grenoble, France]). We also determined whether disengagement adversely affected clinical outcomes. The minimum followup was 12 months (mean, 28.6 months; range, 12-72 months). Disengagement of the glenosphere occurred in 16 of 479 shoulders (3.2\%). In 13 patients, the disengagement was partial (clear step-off between the baseplate and the glenosphere) and was not associated with a poor functional outcome with this short-term followup. In three patients, the disengagement led to a fracture of the central screw, leading to a complete disengagement of the glenosphere from the baseplate, necessitating revision in two; the third refused revision. Partial disengagement was seen in five of 11 Aequalis (TM) prostheses (45.4\%) and eight of 468 Delta III (TM) prostheses (1.7\%). The three total disengagements with central screw breakage all occurred in Delta III (TM) prostheses. We believe differences in the type of locking screws may explain the differences observed between the two types of reverse prostheses.},
  author       = {MIDDERNACHT, BART and De Wilde, Lieven and Mol{\'e}, Daniel and Favard, Luc and Debeer, Philippe},
  issn         = {0009-921X},
  journal      = {CLINICAL ORTHOPAEDICS AND RELATED RESEARCH},
  keyword      = {REPLACEMENT,COMPLICATIONS,RUPTURE,DESIGN,TEAR,REVERSE PROSTHESIS,ROTATOR CUFF DYSFUNCTION,RHEUMATOID-ARTHRITIS,FUNCTIONAL RECOVERY,TOTAL SHOULDER ARTHROPLASTY},
  language     = {eng},
  number       = {4},
  pages        = {892--898},
  title        = {Glenosphere disengagement: a potentially serious default in reverse shoulder surgery},
  url          = {http://dx.doi.org/10.1007/s11999-007-0090-6},
  volume       = {466},
  year         = {2008},
}

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