OsseoFit Stemless Shoulder System (Anatomic)

Inclusion Criteria: * Patient must be 20 years of age or older. * The patient must be anatomically and structurally suited, as evident by scapula and proximal humerus closure, to receive the implants. * Patient planned to receive OsseoFit™ anchor with uncemented fixation. * Patient planned to receive a Modular Alliance Glenoid with bone cement. The porous posts must be coated with Porous Plasma Spray (PPS) and may be inserted without bone cement. * Patient planned to receive shoulder arthroplasty due to osteoarthritis. * Patient must be able and willing to complete the protocol required follow-up schedule. * Patient must be able and willing to sign the IRB approved consent. Exclusion Criteria: * Patient is unwilling or unable to give consent or to comply with the follow-up program. * Patient has any condition which would in the judgement of the Investigator, place the patient at undue risk or interfere with the study. * Patient is known to be pregnant or breastfeeding. * Patient is a vulnerable participant (prisoner, mentally incompetent or unable to understand what participation to the study entails, a known alcohol or drug abuser, and/or anticipated to be non-compliant). * Patient is uncooperative or patient with neurologic disorders who is incapable or unwilling to follow directions. * Patient has any neuromuscular disease compromising the affected limb. * Patient has any sign of infection affecting the shoulder joint or in its proximity which may spread to the implant …