This retrospective CT study of 50 patients uses multiplanar reconstructions perpendicular to each safe zone axis to quantify the size, length, and obliquity of iliosacral screw corridors at S1 and S2 in both normal and dysmorphic sacra — providing anatomic data to guide preoperative planning for posterior pelvic ring fixation.
When planning iliosacral fixation in a dysmorphic sacrum — identified preoperatively on plain films by upsloping ala, mamillary bodies, and noncircular foramina.
Anticipate a steep oblique trajectory at S1 (≈30° caudal-to-cranial on outlet, ≈15° posterior-to-anterior on inlet) with no margin for error, and consider S2 as your primary or supplementary fixation level where a large, near-transverse corridor is reliably present in nearly all dysmorphic patients.
This retrospective CT study of 50 patients uses multiplanar reconstructions perpendicular to each safe zone axis to quantify the size, length, and obliquity of iliosacral screw corridors at S1 and S2 in both normal and dysmorphic sacra — providing anatomic data to guide preoperative planning for posterior pelvic ring fixation.
When planning iliosacral fixation in a dysmorphic sacrum — identified preoperatively on plain films by upsloping ala, mamillary bodies, and noncircular foramina.
Anticipate a steep oblique trajectory at S1 (≈30° caudal-to-cranial on outlet, ≈15° posterior-to-anterior on inlet) with no margin for error, and consider S2 as your primary or supplementary fixation level where a large, near-transverse corridor is reliably present in nearly all dysmorphic patients.