These authors sought to analyze the inter-observer reproducibility of the desired glenoid baseplate 3D positioning during virtual pre-operative planning.
Four shoulder surgeons planned the glenoid baseplate position of a reverse arthroplasty using the CT scans of 30 shoulders with arthritis.
They compared the planned position of the glenoid guide pin entry point, the glenoid baseplate center, the baseplate version and the baseplate inclination among the four surgeons
There was strong consensus on the 3D positioning of the pin entry point: within ± 4 mm for nearly100% of the shoulders. However, there was substantially less agreement within ± 2 mm for superoinferior (77.2%), anteroposterior (67.8%), and mediolateral (39.4%) positions of the baseplate center.
There was weak agreement (K = 0.31, p = 0.17) on the desired inclination and version of the glenoid baseplate within ± 10° among the four surgeons .
Comment: This observed lack of agreement among four experienced surgeons using the same implant system and same planning software indicates the need for much more clinical investigation of the effect of baseplate position and orientation on the clinical outcomes and durability of reverse total shoulder arthroplasty.
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