Titanium Acetabular Component Deformation under Cyclic Loading.

Beckmann, Nicholas A.; Bitsch, Rudi G; Bormann, Theresa; Braun, Steffen; Jaeger, Sebastian (2020). Titanium Acetabular Component Deformation under Cyclic Loading. Materials, 13(1) Molecular Diversity Preservation International MDPI 10.3390/ma13010052

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Acetabular cup deformation may affect liner/cup congruency, clearance and/or osseointegration. It is unclear, whether deformation of the acetabular components occurs during load and to what extent. To evaluate this, revision multi-hole cups were implanted into six cadaver hemipelvises in two scenarios: without acetabular defect (ND); with a large acetabular defect (LD) that was treated with an augment. In the LD scenario, the cup and augment were attached to the bone and each other with screws. Subsequently, the implanted hemipelvises were loaded under a physiologic partial-weight-bearing modality. The deformation of the acetabular components was determined using a best-fit algorithm. The statistical evaluation involved repeated-measures ANOVA. The mean elastic distension of the ND cup was 292.9 µm (SD 12.2 µm); in the LD scenario, 43.7 µm (SD 11.2 µm); the mean maximal augment distension was 79.6 µm (SD 21.6 µm). A significant difference between the maximal distension of the cups in both scenarios was noted (F(1, 10) = 11.404; p = 0.007). No significant difference was noted between the compression of the ND and LD cups, nor between LD cups and LD augments. The LD cup displayed significantly lower elastic distension than the ND cup, most likely due to increased stiffness from the affixed augment and screw fixation.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Orthopaedic, Plastic and Hand Surgery (DOPH) > Clinic of Orthopaedic Surgery

UniBE Contributor:

Beckmann, Nicholas Andreas

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1996-1944

Publisher:

Molecular Diversity Preservation International MDPI

Language:

English

Submitter:

Kathrin Aeschlimann

Date Deposited:

07 Feb 2020 10:59

Last Modified:

07 Feb 2020 11:08

Publisher DOI:

10.3390/ma13010052

PubMed ID:

31861893

Uncontrolled Keywords:

acetabulum implant deformation total hip arthroplasty

BORIS DOI:

10.7892/boris.138769

URI:

https://boris.unibe.ch/id/eprint/138769

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