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Patients characteristics
| N | |
|---|---|
| Sex (f/m) | 19/23 |
| Age (mean, range) | 41 years, 33–56 years |
| Time in vivo (mean, range) | 10 years, 1–19 years |
| Number of operated levels | |
| Single level | 26 |
| Two levels | 15 |
| Three levels | 1 |
Time in vivo represents time from TDR implantation to last plain radiograph
Age age at time of implantation in years
