Table 3.
Surgical and Postoperative Variables
| Surgical variable | Study cohort | Successes | Failures | P-value |
|---|---|---|---|---|
| No. of knees | 56 (%) | 28 | 28 | - |
| Type of EMR | 0.76 | |||
| Mesh | 73.2 (n = 41) | 75.0 (n = 21) | 71.4 (n = 20) | |
| Allograft | 26.8 (n = 15) | 25.0 (n = 7) | 28.6 (n = 8) | |
| Intramedullary mesh fixationα | 41.5 (n = 17/41) | 42.9 (n = 9/21) | 40.0 (n = 8/20) | 0.85 |
| Concurrent revision performed | 0.50 | |||
| Full | 53.6 (n = 30) | 57.1 (n = 16) | 50.0 (n = 14) | |
| Partial | 1.8(n = 1) | 3.6 (n = 1) | 0.0 (n = 0) | |
| Polyethylene componentβ | 25.0 (n = 14) | 17.9 (n = 5) | 32.1 (n = 9) | |
| Noneγ | 19.6 (n = 11) | 21.4(n = 6) | 17.9 (n = 5) | |
| Level of constraint | 0.86 | |||
| Hinge | 33.9 (n = 19) | 35.7 (n = 10) | 32.1 (n = +) | |
| Varus-valgus constraint | 39.3 (n = 22) | 35.7 (n = 10) | 42.9 (n = 12) | |
| Noneδ | 26.8 (n = 15) | 28.6 (n = 8) | 25.0 (n = 7) | |
| Patella management | ||||
| Fully removed | 32.1 (n = 18) | 35.1 (n = 10) | 28.6 (n = 8) | 0.87 |
| Partially removed | 32.1 (n = 18) | 28.6 (n = 8) | 35.7 (n = 10) | |
| Not present | 8.9 (n = 5) | 10.7 (n = 3) | 7.1 (n = 2) | |
| Not removed | 26.8 (n = 15) | 25.0 (n = 7) | 28.6 (n = 8) | |
| Method of immobilization | 0.60 | |||
| Cast | 66.1 (n = 37) | 67.9 (n = 19) | 64.3 (n = 18) | |
| Brace | 32.1 (n = 18) | 32.1 (n = 9) | 32.1 (n = 9) | |
| External fixator | 1.7 (n = 1) | 0.0 (n = 0) | 3.6 (n = 1) | |
| Days immobilized (range) | 57.5 (14 to 97) | 58.9 (15 to 97) | 53.9 (14 to 97) | 0.47 |
| Location | 0.77 | |||
| Medical center 1 | 69.6 (n = 39) | 71.4 (n =20) | 67.9 (n =19) | |
| Medical center 2 | 30.4 (n = 17) | 28.6 (n =8) | 32.1 (n =9) |
EMR = extensor mechanism reconstruction
α
Mesh cemented into tibial canal underneath tibial baseplate as opposed to cemented into an anterior trough made in the tibia. All allografts were fixed in place with screws.
β
Of the 14 patients who underwent a polyethylene component exchange, 3 already had a hinge, 3 varus-valgus constraint, and the remaining 8 no constraint.
γ
Of the 11 patients who did not have anything revised, 5 hinges were in place, 1 VVC, and 5 did not constraint.
δ
Primary TKA components were in place at the end of EMR.