While doing a revision rsa using custom implants and v12 instrument set, we were not able to get the glenosphere screw to fully engage with metal back glenoid (size 46 lp).Glenosphere and fh metal back glenoid had to be removed and replaced with djo encore baseplate and glenosphere.Fh stem stayed in place and custom humeral head (b)(4) was implanted ((b)(4)) after the case it was discovered that due to v12 screwdriver's tapered design, it is impossible for the screwdriver to fully go down screw shaft on 44 implant.No consequence for the patient.
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