Table 1.
Summary of patient patellar symptomatology and radiographic alignment before and after selective hemiepiphyseodesis for treatment of patellar instability (HWR = hardware removal).
| Patient | Knee | Pre-op symptoms |
Implant | aLDFA (deg) |
Post-op symptoms | Follow-up (months) | |||
|---|---|---|---|---|---|---|---|---|---|
| Subluxation | Dislocation | Pre-op | Latest F/U | Changea | |||||
| 1 | L | + | + | Staple | 80.0 | 86.0 | 6.0 | Less frequent recurrent | 49.5 |
| R | + | + | Staple | 77.0 | 87.0 | 10.0 | Subluxations/dislocations | 59.4 | |
| 2 | L | + | – | Staple | 78.0 | 86.0 | 8.0 | None | 9.2 |
| R | + | – | Staple | 78.0 | 88.0 | 10.0 | None | 9.2 | |
| 3 | L | + | – | Staple | 79.0 | 86.0 | 7.0 | None | 35.3 |
| R | + | – | Staple | 73.0 | 88.0 | 15.0 | None | 35.2 | |
| 4 | L | + | – | Staple | 80.0 | 85.0 | 5.0 | None | 9.4 |
| R | + | – | Staple | 80.0 | 87.0 | 7.0 | None | 9.4 | |
| 5 | L | + | – | Staple | 75.0 | 83.0 | 8.0 | None | 71.9 |
| R | + | – | Staple | 77.0 | 85.0 | 8.0 | None | 71.9 | |
| 6 | L | + | + | Staple | 76.0 | 83.0 | 7.0 | None | 22.2 |
| R | + | – | Staple | 78.0 | 85.0 | 7.0 | None | 22.2 | |
| 7 | L | + | + | 8-plate | 75.7 | 79.0 | 3.3 | None | 27.4 |
| R | + | + | 8-plate | 77.7 | 80.7 | 3.0 | Mild recurrent subluxations | 27.4 | |
| 8 | L | + | + | 8-plate | 81.8 | 82.3 | 0.5 | 1 self-reduced dislocation | 42.8 |
| 9 | L | + | – | 8-plate | 77.1 | 80.5 | 3.4 | None | 28.6 |
| R | + | + | 8-plate | 77.7 | 81.1 | 3.4 | 1 recurrent dislocation | 28.6 | |
| 10 | L | + | – | 8-plate | 75.7 | 79.6 | 3.9 | None | 23.4 |
| R | + | – | 8-plate | 77.0 | 80.6 | 3.6 | None | 23.4 | |
| 11 | L | + | – | 8-plate | 77.6 | 82.7 | 5.1 | None | 35.3 |
| R | + | – | 8-plate | 78.3 | 86.1 | 7.8 | None | 13.7 | |
| 12 | R | + | – | 8-plate | 78.0 | 86.0 | 8.0 | 1 subluxation episode | 32.9 |
| 13 | R | + | + | 8-plate | 76.8 | 90.0 | 13.2 | None | 24.1 |
| 14 | L | + | – | 8-plate | 80.0 | 86.4 | 6.4 | Less frequent recurrent | 20.7 |
| R | + | – | 8-plate | 78.6 | 89.4 | 10.8 | Subluxations | 20.7 | |
| 15 | L | + | + | 8-plate | 74.0 | Unavailable | n/a | None | 15.7 |
a
Note: This reflects overall change in the aLDFA from time of pre-op to latest follow-up. In some cases, significant rebound growth was observed after hardware removal. This is detailed in Table 2.