Table 1.
Characteristics of aTSAs and rTSAs
| Variable | aTSA | rTSA |
| Hospital characteristics | ||
| Number of hospitals | 2346 | 2443 |
| Teaching hospital, % (n) | 41 (953) | 40 (976) |
| Urban hospital, % (n) | 82 (1929) | 81 (1981) |
| Bed size, mean ± SD | 224 ± 211 | 220 ± 209 |
| Yearly TSA volume, mean ± SD | 22 ± 28 | 21 ± 28 |
| Surgeon characteristics | ||
| Number of surgeons | 6096 | 6509 |
| Medical school graduation year, mean ± SD | 1996 ± 10 | 1997 ± 10 |
| Yearly TSA volume, mean ± SD | 9 ± 13 | 8 ± 13 |
| Episode characteristics | ||
| Number of episodes | 54,149 | 97,092 |
| Mean subsequent revision rate, % (n) | 3.5 (1908) | 2.4 (2350) |
| Left shoulder, % (n) | 48 (26,192) | 41 (40,024) |
| Mean age in years ± SD | 71 ± 7 | 73 ± 7 |
| Women, % (n) | 56 (30,077) | 61 (58,851) |
| Race, White, % (n) | 93 (50,158) | 93 (90,350) |
| Mean CMS-HCC risk score ± SD | 1 ± 0.9 | 1 ± 1 |
| BMI > 40 kg/m2, % (n) | 6 (3217) | 6 (5433) |
| CHF, % (n) | 5 (2569) | 7 (6845) |
| COPD, % (n) | 9 (5095) | 12 (11,662) |
| Cancer, % (n) | 1 (679) | 1 (1278) |
| Diabetes, % (n) | 19 (10,466) | 22 (21,838) |
| Kidney disease, % (n) | 2 (1146) | 3 (3162) |
| Liver disease, % (n) | 0.6 (317) | 0.6 (600) |
Patient race and ethnicity are available through the CMS beneficiary enrollment database through self-reporting at the time of enrollment. aTSA = anatomic total shoulder arthroplasty; rTSA = reverse total shoulder arthroplasty; CMS-HCC = Centers for Medicare and Medicaid Services Hierarchical Condition Categories; CHF = congestive heart failure; COPD = chronic obstructive pulmonary disease.