• Fabian Lanzerath, Felix Hochberger, Nadine Ott, Michael Hackl, Kilian Wegmann, Lars P Müller, and Tim Leschinger.
• Department of Orthopedic and Trauma Surgery, University Hospital Cologne, Kerpener Street 62, Cologne 50937, Germany. Electronic address: fabianlanzerath@gmail.com.
• Injury. 2023 Apr 16.

IntroductionVarus posteromedial rotational injury mechanisms lead to fractures of the coronoids process' anteromedial facet. As these fractures are often unstable, rapid fracture treatment is vital to prevent progressive osteoarthritis.Materials And MethodsTwelve patients with a fracture of the anteromedial facet treated surgically were enrolled in the study. Computed tomography images were used to classify the fractures according to the system by O'Driscoll et al. Clinical follow-up included each patient's medical record, surgical treatment algorithm, all complications encountered during the follow-up period, Disabilities of the arm, shoulder, and hand score, subjective elbow value, and pain.ResultsA total of 8 men (66.7%) and 4 women (33.3%) were treated surgically and followed-up after a mean period of 45 ± 23 months. The mean DASH score was 11.9 ± 12.9 points. One patient complained of transient neuropathy in the innervation area of the ulnar nerve, however, this existed already pre-operatively and resolved after less than three months.ConclusionsThe presented patient cohort shows that AMF fracture of the coronoid process are unstable lesions according to the bony instability and the frequently ruptured collateral ligament complexes which need to be addressed. The MCL seems to be affected more frequently than previously appreciated.Level Of EvidenceLevel IV; Case Series; Treatment Study.Copyright © 2023. Published by Elsevier Ltd.

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