Table 1.
Demographic characteristics of both study cohorts
| Overall (n = 40) | HA-coated (n = 20) | 3D-printed (n = 20) | p value | |
|---|---|---|---|---|
| Female/male, n (%) | 17 (42.5) / 23 (57.5) | 12 (60) / 8 (40) | 5 (25) / 15 (75) | 0.054 |
| Age, mean (range) | 63 (17–83) | 61 (17–83) | 65 (19–82) | 0.495 |
| Type of implant | – | – | – | 0.752 |
| Proximal femur EPR, n (%) | 20 (50) | 11 (55) | 9 (45) | – |
| Distal femur EPR, n (%) | 20 (50) | 9 (45) | 11 (55) | – |
| Follow-up in days, mean (SD) | 408 (± 287) | 568 (± 315) | 248 (± 125) | < 0.001 |
| Cement fixation, n (%) | 32 (80) | 12 (60) | 20 (100) | < 0.01 |
| Previous revision surgery, n (%) | 27 (67.5) | 12 (60) | 15 (75) | 0.501 |
| Perioperative chemotherapy, n (%) | 4 (10%) | 2 (10) | 2 (10) | 1 |
| Indication | – | – | 0.7 | |
| Revision arthroplasty, n (%) | 13 (32.5) | 5 (25) | 8 (40) | – |
| Periprosthetic infection, n (%) | 14 (35) | 7 (35) | 7 (35) | – |
| Primary malignancy, n (%) | 10 (25) | 6 (30) | 4 (20) | – |
| Bone metastasis, n (%) | 3 (7.5) | 2 (10) | 1 (5) | – |
| Osseointegration yes/no, n (%) | 29 (72.5) | 13 (65) / 7 (35) | 16 (80) / 4 (20) | 0.48 |
| Ongrowth score | – | – | 0.693 | |
| 1, n (%) | 9 (22.5) | 6 (30) | 3 (15) | – |
| 2, n (%) | 2 (5) | 1 (5) | 1 (5) | – |
| 3, n (%) | 19 (47.5) | 9 (45) | 10 (50) | – |
| 4, n (%) | 10 (25) | 4 (20) | 6 (30) | – |
| Days to final ongrowth, mean (SD) | 230 (± 142) | 299 (± 165) | 173 (± 89) | < 0.05 |
| Stem loosening, n (%) | 2 (5) | 1 (5) | 1 (5) | 1 |
Bold p value < 0.05
EPR endoprosthetic replacement, SD standard deviation