Revision Surgeries
| Time After Index Surgery | Problem | Treatment Applied |
|---|---|---|
| Patient 1: 2 days | Incomplete recess decompression | Removal of prosthesis, decompression, reinsertion of same prosthesis |
| Patient 2: 10 mo | Recurrent mechanical stenosis symptoms because of persistent flat back after disc prosthesis at L3–L4 | Disc replacement L5–S1 + anterior cage at posterior fused L4–L5 |
| Patient 3: 26 mo | Recurrent mechanical stenosis symptoms because of persistent flat back after disc prosthesis at L3–L4 | Double posterior osteotomy (OT) (pedicle substraction OT L5 and multiple, limited OTs T9–L1) |
| Additional thoracic kyphosis of 74° | See Figure 3 | |
| Patient 4: 41 mo | Persistent flat-back deformity and progressive instability at disc level with sciatica and low-back pain | Exchange prosthesis L4–L5 for higher-angled prosthesis of different make |
Note. OT = osteotomy.