A biomechanical study of the Birmingham mid head resection arthroplasty: Effect of stem size on femoral neck fracture

Sam Aghayan, Duncan Et Shepherd, Edward T Davis

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)
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Abstract

The Birmingham mid head resection (BMHR) arthroplasty can be used as an alternative to conventional stemmed total hip arthroplasty in young patients unsuitable for hip resurfacing. This study investigated the effect of stem size on femoral neck fracture in the BMHR. Sawbones composite femurs were randomly allocated to one of the following groups: (1) unprepared femur with no prosthesis, (2) femur prepared with a Birmingham hip resurfacing (BHR) prosthesis, (3) femur prepared with a BMHR stem size 1 (BMHR-1) and (4) femur prepared with a BMHR stem size 3 (BMHR-3). Each femur was subjected to a compressive force using a materials testing machine until fracture of the femoral neck occurred. The highest force at fracture was in the unprepared femurs with a mean (±standard deviation) force at failure of 5.9 ± 0.2 kN. The mean force at failure for the femurs fitted with a prosthesis was 2.6 ± 0.4, 3.0 ± 0.4 and 3.5 ± 0.5 kN for the BHR, BMHR-1 and BMHR-3, respectively. Statistical analysis showed that the failure force for the unprepared femur was significantly (p
Original languageEnglish
Pages (from-to)913-8
Number of pages6
JournalInstitution of Mechanical Engineers. Proceedings. Part H: Journal of Engineering in Medicine
Volume227
Issue number8
DOIs
Publication statusPublished - Aug 2013

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