Outcomes for orthopaedic total knee replacement, 2010–2014
| Characteristic | 2010–2011 | 2012–2013 | 2014 | Sig P |
| Baseline | Intervention | Postintervention | Baseline–post | |
| Surgical outcomes | ||||
| LOS, mean (SD) | 3.2 (0.9) | 2.9 (1.0) | 2.4 (1.1) | <0.001 |
| LOS for BMI<30 | 3.2 (0.9) | 2.9 (1.1) | 2.4 (1.1) | <0.001 |
| LOS for BMI≥30 | 3.2 (0.9) | 2.9 (0.9) | 2.4 (1.0) | <0.001 |
| LOS≥4 days (%) | 164 (19) | 147 (14) | 63 (10) | <0.001 |
| 30-day readmission (%)* | 16 (2) | 20 (2) | 12 (2) | 0.94 |
| Any systole≤90 (%) | 75 (9) | 53 (5) | 14 (2) | <0.001 |
| Posthaemorrhagic blood loss (%)† | 707 (82) | 852 (80) | 351 (53) | <0.001 |
| Discharge status (%) | <0.001 | |||
| Home/home health service | 599 (70) | 775 (72) | 578 (87) | |
| Skilled nursing | 171 (20) | 219 (20) | 72 (11) | |
| Other | 90 (10) | 77 (7) | 13 (2) | |
| MET call, any (%) | 22 (3) | 49 (5) | 18 (3) | 0.85 |
| Operating room minutes‡, mean (SD) | 94 (31) | 96 (41) | 89 (29) | 0.29 |
| Patient Satisfaction Survey (5-point scale) | ||||
| Recommend hospital | ||||
| Mean | 4.79 (0.53) | 4.88 (0.35) | 4.88 (0.43) | 0.07 |
| Very good (%) | 200 (83) | 270 (89) | 148 (91) | 0.032 |
| Pain controlled | ||||
| Mean | 4.55 (0.72) | 4.67 (0.60) | 4.68 (0.64) | 0.06 |
| Very good (%) | 155 (65) | 219 (72) | 132 (74) | 0.046 |
| Ready for discharge | ||||
| Mean | 4.62 (0.58) | 4.71 (0.53) | 4.56 (0.80) | 0.35 |
| Very good (%) | 158 (66) | 231 (75) | 124 (70) | 0.44 |
*30-day hospital readmission for any admissions to urgent care or emergency department only.
†Posthaemorrhagic blood loss defined by discharge International Classification of Diseases, Ninth Revision, diagnosis of 285.1.
‡Available only for a subset of patients with specific employers (N=277).
BMI, body mass index; LOS, length of stay; MET, medical emergency team; Sig, significant.