Table 1.
Patients Demographics, Etiology of Primary or Revision Surgery, and Treatment Strategy
| Before 2011 | After 2011 | Total (n, %) | p value | ||
|---|---|---|---|---|---|
| Number (n) Revision Surgery | 139 | 151 | |||
| Female / Male (n %) | 115/2482- 18% | 124/2881- 19% | 0.79 | ||
| Revision Age of Patients mean ± SD, CI | 63.8 ± 8 64.5 ± 10 -2.9 / 1.4 | 0.49 | |||
| BMI (mean ± SD) | |||||
| Normal, n (%) | 52 (37.4) | 59 (38.8) | 111 (38) | 0.07 | |
| Overweight, n (%) | 84 (60.4) | 81 (53.3) | 165 (56.7) | ||
| Obese, n (%) | 3 (2.2) | 12 (7.9) | 15 (5.2) | ||
| Etiology of Primary Surgery of Revised Knees (n= 291) | |||||
| Primary (idiopathic) | 126 (90%) | 141 (92%) | 267 | ||
| Romatoid arthritis | 3 | 2 | 5 | ||
| Post-traumatic | 7 | 3 | 10 | ||
| Other | 3 | 6 | 9 | ||
| Total (n) | 139 | 152 | 291 | ||
| Etiology of Revision Surgeries | |||||
| Infection | 81 (58%) | 73 (48%) | 154 (52%) | 0.08 | |
| Aseptic loosening | 29 (20%) | 56 (36%) | 85 (29%) | 0.002 | |
| Unresolved pain | 11 | 6 | 17 | ||
| Instability | 10 | 6 | 16 | ||
| Periprosthetic fracture | 5 | 8 | 13 | ||
| Insert fracture | 3 | 3 | 6 | ||
| Total (n) | 139 | 152 | 291 | ||
| Treatment | |||||
| 1 stage | 72 | 104 | 176 | 0.004 | |
| 2 stage | 67 | 48 | 115 | ||
| Implants used during revision | |||||
| Revision P. | 87 (62%) | 83 (54%) | 167 (58%) | 0.16 | |
| Constraint Revision P. | 28 (20%) | 35 (23%) | 63 (21%) | 0.55 | |
| Tumor resection prothesis | 0 (0.0 %) | 6 (3.9%) | 6 (2.1%) | NS | |
| Arthrodesis (Ex. Fix. or Nail) | 4 (3 %) | 3 (2%) | 7 (2.4%) | 0.6 | |
| Insert exchange | 8 (6%) | 9 (5.9%) | 17 (5.9%) | 0.9 | |
| Exchange with Primary P. | 12 (9%) | 16 (10 %) | 28 (9.8 %) | 0.58 | |
| CI; Confidence interval of mean difference, n; number, SD; Standard Deviation, %; percentile, BMI; Body Mass Index, P; Prothesis, NS; Not studied, | |||||