The purpose of this study is to evaluate reverse total shoulder arthroplasty patients preoperative objective measurements and operative objective measurements to determine if there is any effect to postoperative outcomes. Patients who were 18 years old or greater at the time of surgery were followed clinically and radiographically to determine best practice and optimal treatment and technique, risk and rate of complication, and postoperative outcomes.

Inclusion Criteria:

1. English speaking
2. >18 years of age
3. Reverse TSA performed by principal investigator

Exclusion Criteria:

1. Non-English speaking
2. <18 years of age

All eligible patients of principal investigator receiving rTSA for any indication at St. Elizabeth Healthcare between January 1, 2010 and October 31, 2017 will be evaluated and included in the data analysis.