Table 2.
Cases examples derived from Luk et al. [10] showing the weakness of the FBCI
| Case no. | Preoperative standing PA Cobb angle (degrees) | FBR Cobb angle (degrees) | Fulcrum flexibility (%) | Postoperative standing PA Cobb angle (degrees) | AngleTC (degrees) | AngleF (degrees) | AngleXF (degrees) | FBCI (%) | XFI |
|---|---|---|---|---|---|---|---|---|---|
| 5 | 70 | 35 | 50 | 32 | 38 | 35 | 3 | 109 | 6.00 |
| 29 | 65 | 30 | 54 | 27 | 38 | 35 | 3 | 109 | 5.57 |
| 11 | 75 | 37 | 51 | 42 | 33 | 38 | −5 | 87 | −9.87 |
| 33 | 50 | 12 | 76 | 17 | 33 | 38 | −5 | 87 | −6.58 |
PA posteroanterior, FBCI fulcrum bending correction index, AngleTC angle of total correction, AngleXF angle contributed by the surgical team, XFI X-Factor Index