Do Safe Radiographic Sacral Screw Pathways Exist in a Pediatric Patient Population and Do They Change With Age?

Abstract:

OBJECTIVES:Iliosacral screw pathways in the first (S1) and second (S2) sacral segments are commonly used for adult pelvic ring stabilization. We hypothesize that radiographically "safe" pathways exist in pediatric patients. SETTING:Academic level I Trauma Center. PATIENTS:All patients between ages 2 and 16 years with a computed tomography scan including the pelvis obtained over a 6-week period (174 children, mean age 10.8 ± 3.9 years; 90 boys, 84 girls). INTERVENTION:The width and height at the "constriction point" in 3 safe screw pathways were measured bilaterally by 3 orthopaedists (resident, trauma fellow, trauma attending). Pathways corresponding to: (1) an "iliosacral" screw at S1, a "trans-sacral trans-iliac" (TSTI) screw at S1, and a TSTI screw at S2. MAIN OUTCOME MEASUREMENTS:(1) Mean width and height of pathways, (2) interrater reliability coefficient, (3) availability of pathways greater than 7 mm, (4) growth of pathways with age, (5) sacral morphology. RESULTS:The interrater reliability coefficient was above 0.917 for all measurements. Radiographically safe pathways were available for 99%, 51%, and 89% of children for iliosacral screws at S1 (width 16.4 ± 2.8 mm, height 15.1 ± 3.3 mm), TSTI screws at S1 (width 7.2 ± 4.9 mm, height 8.3 ± 5.6 mm), and TSTI at S2 (width 9.3 ± 2.2 mm, height 11.5 ± 2.7 mm), respectively. CONCLUSIONS:Contrary to our hypothesis, almost all children aged 2-16 had a radiographically safe screw pathway for an iliosacral screw at S1, and most of the children had an available pathway for a TSTI screw at S2. However, only 51% had a pathway for a TSTI screw at S1.

journal_name

J Orthop Trauma

authors

Burn M,Gary JL,Holzman M,Heydemann JA,Munz JW,Galpin M,Ambrose CG,Achor TS,Kumaravel M

doi

10.1097/BOT.0000000000000421

subject

Has Abstract

pub_date

2016-01-01 00:00:00

pages

41-7

issue

1

eissn

0890-5339

issn

1531-2291

journal_volume

30

pub_type

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