- Discussion:
- based on the assessment of stability;
- lesions are graded as Type I, Type II, or Type III depending on degree
of instability;
- Bucholz noted that on postmortem dissection of pts w/ pelvic fractures
that all injuries to pelvic ring had some injury to both anterior
and posterior portions of the pelvis;
- Type I:
- injuries for which the roentgenograms reveal only anterior rami
frxs demonstrated at least hemorrhage & partial disruption of
posterior
SI ligaments;
- Type II:
- lesion is similar to the AP compression lesion;
- it is characterized by the presence of anterior instability and
partial posterior instability.
- Type III:
- lesion demonstrates complete anterior and posterior instability;
- it may be due to
vertical shear,
Lateral Compression, or complex
mechanism of injury;
- instability is secondary to both the bony and the ligamentous
disruption of pelvic ring;
- degree of ligamentous disruption is a key to stability because
fracture alone will not produce instability without associated
displacement and ligamentous disruption;
