Biomechanical and clinical assessment of dissociation in bipolar hip hemiarthroplasty.
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| Title: | Biomechanical and clinical assessment of dissociation in bipolar hip hemiarthroplasty. |
|---|---|
| Authors: | Ozan, Fırat1 (AUTHOR) firat.ozan@sbu.edu.tr, Okur, Kürşat Tuğrul1 (AUTHOR), Mavi, Fırat2 (AUTHOR), Pekedis, Mahmut2 (AUTHOR) |
| Source: | Bio-Medical Materials & Engineering. May2025, Vol. 36 Issue 3, p185-199. 15p. |
| Subjects: | Hip joint dislocation, Shear strain, Reoperation, Hemiarthroplasty, Polyethylene |
| Abstract: | Background: Dissociation is a special type of dislocation that is rarely seen in bipolar hemiarthroplasty. Objectıve: To investigate the clinical and biomechanical causes of dissociative dislocation of acetabular cup components in the hips of patients after bipolar hemiarthroplasty (BHA). Methods: BHA heads were divided into three groups according to their design. Cam-out and pull-out biomechanical tests were conducted to investigate the separation strengths of the BHA heads. Results: Among the 1684 BHA surgeries performed, the revision surgery rate was 4% (68 hips) and dissociation rate was 0.8% (15 hips). According to the cam-out test result, the highest values in the parameters ultimate force (Fmax) ultimate torque (T), vertical displacement at maximum force (δm), rotation at maximum force (ϕm), maximum principal strain (Ɛmax), minimum principal strain (Ɛmin), average normal strain (Ɛav), maximum shear strain (γmax), uniaxial normal strain (Ɛun) were detected in Type 2 BHA head. The pull-out values of the implants were sufficient to prevent the distraction force that may occur on the implant due to manual traction applied to the hip dislocations. However, in closed reduction maneuvers, cam-out-shaped deformation forces may cause dissociation in Types 1 and 3, but not in Type 2 BHA heads. According to the pull-out test results, while high values were detected in the parameters Fmax and stiffness (k) in the Type 2 BHA head, δm and maximum force (E) parameters were found to be high in the Type 1 BHA head. In the cam-out test, a strong positive relationship was found between the thickness and width of the polyethylene locking ring and Fmax, T, δm, ϕm, Ɛmax, γmax, Ɛun. Conclusıon: Better BHA head designs and polyethylene designs may help resolve the rare problem of dissociation, which almost always leads to resurgical procedures. [ABSTRACT FROM AUTHOR] |
| Copyright of Bio-Medical Materials & Engineering is the property of Sage Publications Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
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| Header | DbId: egs DbLabel: Engineering Source An: 185037934 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Biomechanical and clinical assessment of dissociation in bipolar hip hemiarthroplasty. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Ozan%2C+Fırat%22">Ozan, Fırat</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> firat.ozan@sbu.edu.tr</i><br /><searchLink fieldCode="AR" term="%22Okur%2C+Kürşat+Tuğrul%22">Okur, Kürşat Tuğrul</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Mavi%2C+Fırat%22">Mavi, Fırat</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Pekedis%2C+Mahmut%22">Pekedis, Mahmut</searchLink><relatesTo>2</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Bio-Medical+Materials+%26+Engineering%22">Bio-Medical Materials & Engineering</searchLink>. May2025, Vol. 36 Issue 3, p185-199. 15p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Hip+joint+dislocation%22">Hip joint dislocation</searchLink><br /><searchLink fieldCode="DE" term="%22Shear+strain%22">Shear strain</searchLink><br /><searchLink fieldCode="DE" term="%22Reoperation%22">Reoperation</searchLink><br /><searchLink fieldCode="DE" term="%22Hemiarthroplasty%22">Hemiarthroplasty</searchLink><br /><searchLink fieldCode="DE" term="%22Polyethylene%22">Polyethylene</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Background: Dissociation is a special type of dislocation that is rarely seen in bipolar hemiarthroplasty. Objectıve: To investigate the clinical and biomechanical causes of dissociative dislocation of acetabular cup components in the hips of patients after bipolar hemiarthroplasty (BHA). Methods: BHA heads were divided into three groups according to their design. Cam-out and pull-out biomechanical tests were conducted to investigate the separation strengths of the BHA heads. Results: Among the 1684 BHA surgeries performed, the revision surgery rate was 4% (68 hips) and dissociation rate was 0.8% (15 hips). According to the cam-out test result, the highest values in the parameters ultimate force (Fmax) ultimate torque (T), vertical displacement at maximum force (δm), rotation at maximum force (ϕm), maximum principal strain (Ɛmax), minimum principal strain (Ɛmin), average normal strain (Ɛav), maximum shear strain (γmax), uniaxial normal strain (Ɛun) were detected in Type 2 BHA head. The pull-out values of the implants were sufficient to prevent the distraction force that may occur on the implant due to manual traction applied to the hip dislocations. However, in closed reduction maneuvers, cam-out-shaped deformation forces may cause dissociation in Types 1 and 3, but not in Type 2 BHA heads. According to the pull-out test results, while high values were detected in the parameters Fmax and stiffness (k) in the Type 2 BHA head, δm and maximum force (E) parameters were found to be high in the Type 1 BHA head. In the cam-out test, a strong positive relationship was found between the thickness and width of the polyethylene locking ring and Fmax, T, δm, ϕm, Ɛmax, γmax, Ɛun. Conclusıon: Better BHA head designs and polyethylene designs may help resolve the rare problem of dissociation, which almost always leads to resurgical procedures. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Bio-Medical Materials & Engineering is the property of Sage Publications Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1177/09592989241306688 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 15 StartPage: 185 Subjects: – SubjectFull: Hip joint dislocation Type: general – SubjectFull: Shear strain Type: general – SubjectFull: Reoperation Type: general – SubjectFull: Hemiarthroplasty Type: general – SubjectFull: Polyethylene Type: general Titles: – TitleFull: Biomechanical and clinical assessment of dissociation in bipolar hip hemiarthroplasty. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Ozan, Fırat – PersonEntity: Name: NameFull: Okur, Kürşat Tuğrul – PersonEntity: Name: NameFull: Mavi, Fırat – PersonEntity: Name: NameFull: Pekedis, Mahmut IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 05 Text: May2025 Type: published Y: 2025 Identifiers: – Type: issn-print Value: 09592989 Numbering: – Type: volume Value: 36 – Type: issue Value: 3 Titles: – TitleFull: Bio-Medical Materials & Engineering Type: main |
| ResultId | 1 |
