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Injury Complexity Factors Predict Heterotopic Ossification Restricting Motion After Elbow Trauma

  • Symposium: Traumatic Elbow Instability and its Sequelae
  • Published:
Clinical Orthopaedics and Related Research®

Abstract

Background

Heterotopic ossification (HO) is a common extrinsic cause of elbow stiffness after trauma. However, factors associated with the development of HO are incompletely understood.

Questions/purposes

We retrospectively identified (1) patient-related demographic factors, (2) injury-related factors, and (3) treatment-related factors associated with the development of HO severe enough to restrict motion after surgery for elbow trauma. We also determined what percentage of the variation in HO restricting motion was explained by the variables studied.

Methods

Between 2001 and 2007, we performed surgery on 417 adult patients for elbow fractures; of these, 284 (68%) were available for radiographs at a minimum of 4 months and clinical review at a minimum of 6 months after surgery (mean, 7.9 months; range, 6–31 months). HO was classified according to the Hastings and Graham system. Patients with HO restricting motion (defined as a Hastings and Graham Class II or III) were compared with patients without HO restricting motion in terms of demographics, fracture location, elbow dislocation, open wound, mechanism of injury, ipsilateral fracture, head trauma, time from injury to surgery, number of surgeries within 4 weeks, total number of surgeries, bone graft, and infection, using bivariate and multivariable analyses. A total of 96 patients had radiographic HO, and in 27 (10% of those available for followup), it restricted motion.

Results

There were no patient-related demographic factors that predicted the formation of symptomatic HO. Ulnohumeral dislocation in addition to fracture (odds ratio, 2.38; 95% CI, 1.01–5.64; p = 0.048) but not fracture location was associated with HO. Longer time from injury to definitive surgery and number of surgical procedures in the first 4 weeks were also independent predictors of HO (p = 0.01 and 0.004, respectively). These factors explained 20% of the variance in risk for HO restricting motion.

Conclusions

HO restricting motion after operative elbow fracture treatment associates with factors that seem related to injury complexity, in particular, ulnohumeral dislocation, delay, and number of early surgeries; however, a substantial portion of the variation among patients with elbow fracture who develop restrictive HO remains unexplained.

Level of Evidence

Level III, therapeutic study. See Instructions for Authors for a complete description of levels of evidence.

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Correspondence to David Ring MD, PhD.

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Each author certifies that he or she, or a member of his or her immediate family, has no commercial associations (eg, consultancies, stock ownership, equity interest, patent/licensing arrangements, etc) that might pose a conflict of interest in connection with the submitted article.

All ICMJE Conflict of Interest Forms for authors and Clinical Orthopaedics and Related Research editors and board members are on file with the publication and can be viewed on request.

Each author certifies that his or her institution approved the human protocol for this investigation, that all investigations were conducted in conformity with ethical principles of research, and that informed consent for participation in the study was obtained.

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Wiggers, J.K., Helmerhorst, G.T.T., Brouwer, K.M. et al. Injury Complexity Factors Predict Heterotopic Ossification Restricting Motion After Elbow Trauma. Clin Orthop Relat Res 472, 2162–2167 (2014). https://doi.org/10.1007/s11999-013-3304-0

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  • DOI: https://doi.org/10.1007/s11999-013-3304-0

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