Table 4.
Outcomes and Complications
| Outcome | Study cohort | Successes | Failures | P-value |
|---|---|---|---|---|
| No. of kneesα | 56 (%) | 28 | 28 | - |
| Last extensor lag (range) | 36.9° (0.0 to 90.0) | 5.4° (0.0 to 20.0) | 71.0° (10.0 to 90.0) | < 0.01 |
| KOOS JR score (range) | 59.2 (8.0 to 100.0) | 67.1 (42.3 to 100.0) | 48.8 (8.0 to 73.3) | < 0.01 |
| KOOS JR meeting TKA PASS thresholdβ | 38.6 (n = 17/44) | 64.0 (n = 16/25) | 5.3 (n = 1/19) | < 0.01 |
| EMR in-situ at final follow-up | 75.0 (n = 42) | 100.0 (n = 28) | 50.0 (n = 14) | < 0.01 |
| Immobilization ulcer | 21.4 (n = 12) | 25.0 (n = 7) | 17.9 (n = 5) | 0.52 |
| Requiring ambulatory assist | 69.1 (n = 38) | 53.6 (n = 15) | 85.2 (n = 23) | < 0.01 |
| Any reoperation | 42.9 (n = 24) | 28.6 (n = 8) | 57.1 (n = 16) | 0.03 |
| Any I&Dδ | 16.1 (n = 9) | 14.3 (n = 4) | 17.9 (n = 5) | 0.72 |
| No. of reoperations (range) | 0.7 (0.0 to 3.0) | 0.5 (0.0 to 3.0) | 1.1 (0.0 to 3.0) | 0.06 |
| Above knee amputation | 7.1 (n = 4) | - | 14.3 (n = 4) | 0.04 |
| Modular fusion | 3.6 (n = 2) | - | 7.1 (n = 2) | 0.15 |
| Days to amputation or fusion (range) | - | 489.7 (21.0 to 936.0) | ||
| Requiring revision EMR | 14.3 (n = 8) | - | 28.6 (n = 8) | < 0.01 |
| Days to EMR failure (range) | - | 363.6 (64.0 to 801.0) | ||
| 90-day ED visit rate | 16.1 (n = 9) | 17.9 (n = 5) | 14.3 (n = 4) | 0.72 |
| Number of 90-day ED visits (range) | 0.1 (0.0 to 2.0) | 0.1 (0.0 to 1.0) | 0.2 (0.0 to 2.0) | 0.66 |
| 90-day readmission rate | 14.3 (n = 8) | 10.7 (n = 3) | 17.9 (n = 5) | 0.45 |
| Number of 90-day readmissions (range) | 0.2 (0.0 to 2.0) | 0.2 (0.0 to 2.0) | 0.2 (0.0 to 2.0) | 0.95 |
| All-cause mortality | 8.2 (n = 4/49) | 0.0 (n = 0/25) | 16.7 (n = 4/24) | 0.04 |
EMR = extensor mechanism reconstruction; I&D = irrigation and debridement; ED = emergency department; KOOS JR = Short form of knee injury and osteoarthritis outcome score; PASS = patient acceptable symptom state
α
Number of knees/lower extremities included in each cohort.
β
Rate at which the most recent KOOS JR score was at or above the minimum patient acceptable symptom state (PASS) for TKA. KOOS JR scores were not reported in 100 of study patients.
δ
Of those undergoing I&D, 3 of the 9 had a prior history of prosthetic joint infection