Terms and formulas for loss and gain for different parameters
| Parameter | Loss from Previous Fracture | Gain from Vertebroplasty |
|---|---|---|
| Kyphosis angle | (Kyphosis angle)pre | (Kyphosis angle)pre − (kyphosis angle)post |
| Wedge angle | (Wedge angle)pre | (Wedge angle)pre − (wedge angle)post |
| Height* | ||
| Anterior border | 1 − (A/NP)pre | (A/NP)post − (A/NP)pre |
| Center | 1 − (C/NP)pre | (C/NP)post − (C/NP)pre |
| Posterior border | 1 − (P/NP)pre | (P/NP)post − (P/NP)pre |
Note.—For each parameter, the restoration percentage was calculated by dividing term listed under “Gain from Vertebroplasty” by the term listed under “Loss from Previous Fracture.”
* A indicates anterior border; C, center; P, posterior border; NP, height of the posterior border of an adjacent normal vertebral body.