What Is the Frequency of Early Dissociation of Bipolar Cups and What Factors Are Associated With Dissociation?

Clinical Orthopaedics and Related Research
Young-Kyun LeeKyung-Hoi Koo

Abstract

Dissociation between a prosthetic cup and femoral head is a rare complication of bipolar hemiarthroplasty that usually occurs during closed reduction of a dislocated bipolar cup. The dissociation usually results in reoperation because closed reduction is challenging. To our knowledge, no study has reported on the frequency of bipolar cup-femoral head dissociation, and risk factors for dissociation are unknown. The purposes of this study were (1) to evaluate the frequency of dissociation of prosthetic femoral heads from bipolar cups during manual reduction of a dislocated bipolar hemiarthroplasty; and (2) to explore in a preliminary fashion any prosthesis or patient factors that may be associated with dissociation. From May 2003 to August 2016, 60 bipolar hemiarthroplasties were treated at three institutions as a result of early (within 3 years) dislocation after arthroplasty; of these, 55 could be identified and categorized in terms of the type of locking mechanism used, and these were the patients evaluated in this retrospective study. Because the index hemiarthroplasties were not performed exclusively at the three participating centers, we cannot comment on the indications for prosthesis selection in these patients (such as w...Continue Reading

References

Jan 1, 1984·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·S W Krein, E Y Chao
Aug 5, 2004·Clinical Orthopaedics and Related Research·Masahiro HasegawaAtsumasa Uchida
Jun 25, 2009·Journal of Orthopaedic Trauma·Timothy Bhattacharyya, Kenneth J Koval
Jun 18, 2014·The Journal of Arthroplasty·Andrea Emilio Salvi
Sep 2, 2014·Clinics in Orthopedic Surgery·Young-Kyun LeeKyung-Hoi Koo
Mar 10, 2015·The Journal of Arthroplasty·Young-Kyun LeeKyung-Hoi Koo
Sep 5, 2015·International Journal of Surgery Case Reports·Varah YuenyongviwatTheerawit Hongnaparak
Jun 4, 2017·The Journal of Arthroplasty·Peter L LewisAlana R Cuthbert

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