Trauma I Please enable JavaScript in your browser to complete this form.Please enable JavaScript in your browser to complete this form.Question 1)Figure A is the CT scan of a 43-year-old woman who was involved in a motor vehicle collision and sustained multiple injuries including a pelvic fracture. The injury shown in the CT scan is most consistent with a (an)Trauma Question 1) Figure A Select the Correct AnswerCombined-mechanism (CM) injury with a VS mechanism with a completely unstable right hemipelvis and a LC injury resulting in a completely unstable left hemipelvis.Anteroposterior compression (APC) mechanism resulting in a completely unstable right hemipelvis.APC mechanism resulting in a partially unstable right and left hemipelvis.Vertical shear mechanism resulting in a partially unstable left hemipelvis internal rotation and a completely unstable right hemipelvis external rotation (open book).Lateral compression mechanism type 3 resulting in a partially unstable left hemipelvis internal rotation and a partially unstable right hemipelvis external rotation (open book).Correct Answer: lateral compression mechanism type 3 resulting in a partially unstable left hemipelvis internal rotation and a partially unstable right hemipelvis external rotation (open book). Explanation: This patient has a lateral compression injury on the left side and an open book (APC) injury on the right (an LC3 Young and Burgess classification)/ This is not a CM injury. Response B is not correct because the right hemipelvis likely involves an APC mechanism but not an APC type 3 mechanism (the left side is not described). This is not a bilateral APC injury, so Response C is incorrect. This is not a vertical shear injury, so Response D is incorrect. Response E is correct; this is a lateral compression injury on the left side with a sacral fracture and an open-book APC mechanism on the right side. References: Source AAOS 2015 OITE Pennal GF, Tile M, Waddell JP, Garside H. Pelvic disruption: assessment and classification. Clin Orthop Relat Res. 1980 Sep;(151):12-21. PMID: 7418295. Marsh JL, Slongo TF, Agel J, Broderick JS, Creevey W, DeCoster TA, Prokuski L, Sirkin MS, Ziran B, Henley B, Audigé L. Fracture and dislocation classification compendium - 2007: Orthopaedic Trauma Association classification, database and outcomes committee. J Orthop Trauma. 2007 Nov-Dec;21(10 Suppl):S1-133. doi: 10.1097/00005131-200711101-00001. PMID: 18277234. Young JW, Burgess AR, Brumback RJ, Poka A. Pelvic fractures: value of plain radiography in early assessment and management. Radiology. 1986 Aug;160(2):445-51. PubMed PMID: 3726125. Wrong Answer: Please try again! Submit Post navigation Previous QuestionFoot & Ankle INext QuestionSports I
