Table 4.
Overall clinical results for the entire study cohort of 51 patients with an average follow-up of 4 years (mean 50.5 months) following total lumbar disc replacement
| Preoperative data | 3 months | 6 months | 12 months | 24 months | 36 months | 48 months | Overall improvement (difference preoperative vs. last FU) | Overall results at last FU | |
|---|---|---|---|---|---|---|---|---|---|
| Number of patients | n = 51 | n = 34 | n = 33 | n = 30 | n = 34 | n = 24 | n = 15 | n = 51 | n = 51 |
| Oswestry Disability Index (ODI) | 39.3 ± 12.7 % | 18.5 ± 15.9 % | 17.3 ± 17.5 % | 20.2 ± 19.0 % | 15.9 ± 17.5 % | 15.0 ± 18.5 % | 11.5 ± 12.6 % | −24.1 ± 16.8 % | 15.2 ± 16.7 % |
| Visual Analogue Scale Scores (VAS) | 6.9 ± 1.6 | 2.6 ± 2.1 | 2.5 ± 2.4 | 2.7 ± 2.8 | 2.5 ± 2.5 | 2.6 ± 2.9 | 1.9 ± 1.8 | −4.1 ± 2.8 | 2.7 ± 2.6 |
| Subjective satisfaction rates | |||||||||
| Highly satisfied | – | 54.8 % (n = 17/31) | 62.1 % (n = 18/29) | 69.2 % (n = 18/26) | 70.0 % (n = 21/30) | 63.6 % (n = 14/22) | 65.5 % (n = 9/12) | n.a. | 75.6 % (n = 34/45) |
| Satisfied | – | 29.0 % (n = 9/31) | 31.0 % (n = 9/29) | 23.1 % (n = 6/26) | 16.7 % (n = 5/30) | 27.3 % (n = 6/22) | 25.5 % (n = 3/12) | 17.8 % (n = 8/45) | |
| Not satisfied | – | 16.1 % (n = 5/31) | 6.9 % (n = 2/29) | 7.7 % (n = 2/26) | 13.3 % (n = 4/30) | 9.1 % (n = 2/22) | 0 % (n = 0) | 6.7 % (n = 3/45) | |
| Satisfied + highly satisfied | – | 83.9 % (n = 26/31) | 93.1 % (n = 27/29) | 92.3 % (n = 24/26) | 86.7 % (n = 26/30) | 90.1 % (n = 20/22) | 100 % (n = 12/12) | n.a. | 93.3 % (n = 42/45) |
Mean values ± standard deviation (SD) are provided
ODI Oswestry Disability Index, VAS Visual Analogue Scale, FU follow-up