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논문 기본 정보

자료유형
학술저널
저자정보
Christen E. Chalmers (University of California Irvine) David J. Wright (University of California Irvine) Nilay A. Patel (University of California Irvine) Hunter Hitchens (Cornell University) Michelle McGarry (Congress Medical Foundation) Thay Q. Lee (Congress Medical Foundation) John A. Scolaro (University of California Irvine)
저널정보
대한견주관절의학회 대한견주관절의학회지 대한견주관절의학회지 제25권 제4호
발행연도
2022.12
수록면
282 - 287 (6page)

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초록· 키워드

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Background: Muscular forces drive proximal humeral fracture deformity, yet it is unknown if arm position can help mitigate such forces. Our hypothesis was that glenohumeral abduction and humeral internal rotation decrease the pull of the supraspinatus and subscapularis muscles, minimizing varus fracture deformity.
Methods: A medial wedge osteotomy was performed in eight cadaveric shoulders to simulate a two-part fracture. The specimens were tested on a custom shoulder testing system. Humeral head varus was measured following physiologic muscle loading at neutral and 20° humeral internal rotation at both 0° and 20° glenohumeral abduction.
Results: There was a significant decrease in varus deformity caused by the subscapularis (p<0.05) at 20° abduction. Significantly increasing humeral internal rotation decreased varus deformity caused by the subscapularis (p<0.05) at both abduction angles and that caused by the supraspinatus (p<0.05) and infraspinatus (p<0.05) at 0° abduction only.
Conclusions: Postoperative shoulder abduction and internal rotation can be protective against varus failure following proximal humeral fracture fixation as these positions decrease tension on the supraspinatus and subscapularis muscles. Use of a resting sling that places the shoulder in this position should be considered.

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INTRODUCTION
METHODS
RESULTS
DISCUSSION
REFERENCES

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