A ported, proximally-cemented femoral stem for total hip arthroplasty. Development and clinical application.

A ported, proximally-cemented femoral stem for total hip arthroplasty. Development and clinical application. Research Abstract Details 

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A ported, proximally-cemented femoral stem for total hip arthroplasty. Development and clinical application. Abstract Text:

A A Edidin,P O Merritt,B H Hack,M T Manley,

We describe the development and early clinical application of a ported, proximally-cemented titanium stem for cemented total hip arthroplasty. PMMA bone cement is delivered to the proximal femur under pressure after the stem has been positioned within the femoral canal. A mid-stem cement occluder contains the cement to the proximal stem only. A tapered body is incorporated in the design of the stem to reduce the structural stiffness and hence the degree of stress shielding within the reconstructed joint. We performed preclinical studies to measure the reduction in porosity and the pressurisation achieved. The porosity, as measured by the void percentage within the cured cement mantle, was reduced by more than 50% and there was an almost threefold increase in the mean pressure. Mechanical testing of the stem, using a three-point bend test, showed that the addition of cement injection ports on the anterior and posterior sides of the body of the proximal stem did not reduce its strength. Finite-element analysis indicated that, compared with a fully-cemented conventional stem, there was no change in the stresses within the cement mantle. In a series of 40 proximally-cemented stems followed for up to six years (mean 51 months) the mean Harris hip score was 91, and 85% of patients had good or excellent results. There was excellent pain relief, an increased level of activity and good patient satisfaction. One mechanical failure of the stem required revision at three years after implantation. The early results indicate that the clinical performance was equal to that achieved with other modern cemented stems. Radiological evaluation showed excellent results with no evidence of stress shielding. Further follow-up will determine if long-term stress shielding is reduced and if revision is made easier by the absence of a distal cement mantle.

A ported, proximally-cemented femoral stem for total hip arthroplasty. Development and clinical application. Publishing Authors By Initials

AA Edidin,PO Merritt,BH Hack,MT Manley,

For similar inorganic chemicals: elements: metals, light: titanium research abstracts see: inorganic chemicals: elements: metals, light: titanium research

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A ported, proximally-cemented femoral stem for total hip arthroplasty. Development and clinical application. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: The Journal of bone and joint surgery. British vol

VOLUME: 80

Page Numbers: 869-75

Journal Abbreviation:

ISSN: 0301-620X

DAY: 14

MONTH: Sep

YEAR: 1998

A ported, proximally-cemented femoral stem for total hip arthroplasty. Development and clinical application. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 375355

A ported, proximally-cemented femoral stem for total hip arthroplasty. Development and clinical application. Keywords Mesh Terms:

KEYWORDS: Titanium

MESH TERMS: radiography

Chemical & Substance for Abstract: A ported, proximally-cemented femoral stem for total hip arthroplasty. Development and clinical application. Information

Substance Name: Titanium

Registry Number: 7440-32-6

Grant and Affiliation Information for A ported, proximally-cemented femoral stem for total hip arthroplasty. Development and clinical application.

AFFILIATION: St Vincent's Medical Centre, Los Angeles, USA.

Country: ENGLAND

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MEDLINETA: J Bone Joint Surg Br

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