This is a 2 Year Follow up Clinical and Radiographic Analysis of a Novel All Polyethelene Glenoid Component in Standard Total Shoulder Arthroplasty.

Methods and Materials: The standard of care in my practice and most practices is to have arthroplasty patients return for an annual clinical and radiographic evaluation. We are asking our patients that choose to enroll in the study to simply return for routine "standard of care" follow up. The only deviation from this standard of care is the method by which we obtain the xrays. In this study we will obtain true AP (anterior/posterior) and axillary views on there return visit. These are our normal "standard of care" xrays. The only difference is that we are going to obtain these Xrays using fluoroscopic guidance. The reason we are using fluoroscopic guidance is that we want to make sure that the xrays are perfect with the beam oriented tangential to the backside of the glenoid. This will allow us to see any lucencies behind the glenoid and allow us to truly assess for any loosening. Standard Xrays attempt to have the beam oriented tangential to the glenoid but just small deviations can underestimate any potential lucent lines. This will expose the study subjects to small amounts of radiation that would be outside the "standard of care". The patients will be informed of this and the dose recorded. The fluoroscopy procedure will take about 15-20 minutes, but the total radiation exposure for the activities performed will be up to, but not more than three minutes. The total radiation will be less than 3 rem. A licensed radiology technologist (RT) employed by the hospital will perform the fluoroscopy procedures and the Xrays. Jeff Jarnagin PA or Edwin Spencer MD will be present at all times during the fluoroscopy procedure. Both Dr Spencer and Jeff Jarnagin have been involved in other similar studies and have completed "training in human research subject protection". Subjects will be provided proper shielding (lead apron) throughout the activities. The licensed radiology technologist at the hospital will have the final responsibility for providing proper shielding.

As with every clinical study, there may be some risks. Since the fluoroscope emits X-rays, subjects will be exposed to radiation. During fluoroscopy, the actual dose of radiation exposure that will be administered, is within minimal risk limits and will be much lower than those known to produce detectable health effects. For this study, the fluoroscopy machine will be on for up to, but not more than, 3 minutes total and the amount of radiation will not exceed 3 rem which includes the radiation from the standard Xrays. According to published literature, exposure risks below 5-10 rem are minimal. Health effects have not been consistently demonstrated for radiation exposure below 10 rem.

Subjects will also fill out 2 data sheets. One is for the PENN score and the other is for the ASES (Association of Shoulder and Elbow Surgeons) score which are validated clinical outcomes measures. These forms are routinely filled out at their annual clinical visits and are considered standard of care.

Data Analysis: The radiographs will be independently evaluated by 2 different board certified radiologists blinded to the clinical results and names of the patients. The films will be re-evaluated by each radiologist (they will be blinded to their initial reading) and the average of their results will be recorded. The clinical ASES and PENN scores will be recorded and differences in the preoperative and postoperative scores will be reported. Statistical analysis such as a students t test is not necessary as we are not comparing two groups however simple descriptive statistics will be used to report the change in ASES and PENN scores and most importantly the presence or absence of lucent lines and location of any lucencies. The lucent lines will be graded according to the method developed by Lazarus et al.4 The medical records and Xray data will be kept as confidential as possible under current local, state, and federal laws. The researchers will examine the medical records for information related to both of the shoulders and the study data. The medical records that identify the subject and the consent form will be reviewed by the researchers. The results of this research project may be presented at meetings or in publications. The identity of the subject will not be disclosed in any presentation or publication.

The Xrays will be stored in a secure place at the Knoxville Orthopaedic Clinic. These Xrays will be accessible by only approved personnel. They will be kept indefinitely for the possibility of future use in research or publications.