UMass Chan Medical School Faculty Publications

UMMS Affiliation

Department of Orthopedics and Physical Rehabilitation

Publication Date


Document Type

Article Postprint


Musculoskeletal Diseases | Orthopedics | Trauma


Objectives: to quantify radiographic outcomes and identify predictors of late displacement in the nonoperative treatment of LC-2 pelvic ring injuries.

DESIGN: Retrospective review.

SETTING: Two level 1 trauma centers.

PATIENTS/PARTICIPANTS: Thirty eight patients > /=18 years old with LC-2 pelvic ring injuries.

INTERVENTION: Nonoperative treatment.

MAIN OUTCOME MEASUREMENTS: Crescent fracture displacement measured on initial axial Computed Tomography. Change in pelvic ring alignment measured by the Deformity Index, Simple Ratio, Inlet and Outlet Ratios on successive plain radiographs.

RESULTS: Patients in this study had minimally displaced LC-2 pelvic ring injuries, with median initial crescent fracture displacement of 2mm and median initial Deformity Index of 2%. No patient had a > /=10 percentage point change in Deformity Index over the treatment period, but small amounts of displacement were seen on the other ratios. No patients initially selected for nonoperative treatment converted to operative treatment. No radiographic predictors of late displacement were identified. Bilateral pubic rami fractures and the presence of a complete sacral fracture ipsilateral to the crescent fracture were not associated with late displacement.

CONCLUSIONS: A spectrum of injury severity and stability exists in the LC-2 pattern. Nonoperative treatment of LC-2 injuries with low initial deformity and crescent fracture displacement results in minimal subsequent displacement.

LEVEL OF EVIDENCE: Therapeutic Level IV. See Instructions for Authors for a complete description of levels of evidence.


Pelvic fracture, Pelvic ring injury, LC-2, Deformity, Nonoperative treatment

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DOI of Published Version



Gibbs S, Colcord M, Curtin P, Roomian T, Seymour R, Phelps K, Kempton L, Hsu J, Sims S, Bosse M, Swart E, Karunakar M. Nonoperative treatment of select LC-II pelvic ring injuries (OTA/AO 61B2.2) results in a low rate of radiographic displacement. J Orthop Trauma. 2021 May 24. doi: 10.1097/BOT.0000000000002187. Epub ahead of print. PMID: 34050081. Link to article on publisher's site

Related Resources

Link to Article in PubMed

Journal/Book/Conference Title

Journal of orthopaedic trauma

PubMed ID