Measurement of the migration of a focal knee resurfacing implant with radiostereometry
Identifieur interne : 000601 ( Main/Exploration ); précédent : 000600; suivant : 000602Measurement of the migration of a focal knee resurfacing implant with radiostereometry
Auteurs : Olof Sköldenberg ; Thomas Eisler ; André Stark ; Olle Muren ; Nicolas Martinez-Carranza ; Leif Ryd [Suède]Source :
- Acta Orthopaedica [ 1745-3674 ] ; 2014.
Abstract
Articular resurfacing metal implants have been developed to treat full-thickness localized articular cartilage defects. Evaluation of the fixation of these devices is mandatory. Standard radiostereometry (RSA) is a validated method for evaluation of prosthetic migration, but it requires that tantalum beads are inserted into the implant. For technical reasons, this is not possible for focal articular resurfacing components. In this study, we therefore modified the tip of an articular knee implant and used it as a marker for RSA, and then validated the method.
We modified the tip of a resurfacing component into a hemisphere with a radius of 3 mm, marked it with a 1.0-mm tantalum marker, and implanted it into a sawbone marked with 6 tantalum beads. Point-motion RSA of the “hemisphere bead” using standard automated RSA as the gold standard was compared to manual measurement of the tip hemisphere. 20 repeated stereograms with gradual shifts of position of the specimen between each double exposure were used for the analysis. The tip motion was compared to the point motion of the hemisphere bead to determine the accuracy and precision.
The accuracy of the manual tip hemisphere method was 0.08–0.19 mm and the precision ranged from 0.12 mm to 0.33 mm.
The accuracy and precision for translations is acceptable when using a small hemisphere at the tip of a focal articular knee resurfacing implant instead of tantalum marker beads. Rotations of the implant cannot be evaluated. The method is accurate and precise enough to allow detection of relevant migration, and it will be used for future clinical trials with the new implant.
Url:
DOI: 10.3109/17453674.2013.869654
PubMed: 24286562
PubMed Central: 3940996
Affiliations:
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(KIDS)</addr-line>,<country> Stockholm</country></nlm:aff><wicri:noCountry code="nlm country"> Stockholm</wicri:noCountry></affiliation></author><author><name sortKey="Stark, Andre" sort="Stark, Andre" uniqKey="Stark A" first="André" last="Stark">André Stark</name><affiliation><nlm:aff id="AF0001"><institution>Department of Orthopaedics at Danderyd Hospital and Karolinska Institutet</institution>,<addr-line> Department of Clinical Sciences at Danderyd Hospital (KIDS)</addr-line>,<country> Stockholm</country></nlm:aff><wicri:noCountry code="nlm country"> Stockholm</wicri:noCountry></affiliation></author><author><name sortKey="Muren, Olle" sort="Muren, Olle" uniqKey="Muren O" first="Olle" last="Muren">Olle Muren</name><affiliation><nlm:aff id="AF0001"><institution>Department of Orthopaedics at Danderyd Hospital and Karolinska Institutet</institution>,<addr-line> Department of Clinical Sciences at Danderyd Hospital (KIDS)</addr-line>,<country> Stockholm</country></nlm:aff><wicri:noCountry 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O:measurement:of:the</idno><idno type="wicri:Area/Main/Merge">000603</idno><idno type="wicri:Area/Main/Curation">000601</idno><idno type="wicri:Area/Main/Exploration">000601</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Measurement of the migration of a focal knee resurfacing implant with radiostereometry</title><author><name sortKey="Skoldenberg, Olof" sort="Skoldenberg, Olof" uniqKey="Skoldenberg O" first="Olof" last="Sköldenberg">Olof Sköldenberg</name><affiliation><nlm:aff id="AF0001"><institution>Department of Orthopaedics at Danderyd Hospital and Karolinska Institutet</institution>,<addr-line> Department of Clinical Sciences at Danderyd Hospital (KIDS)</addr-line>,<country> Stockholm</country></nlm:aff><wicri:noCountry code="nlm country"> Stockholm</wicri:noCountry></affiliation></author><author><name sortKey="Eisler, Thomas" sort="Eisler, Thomas" uniqKey="Eisler T" first="Thomas" last="Eisler">Thomas Eisler</name><affiliation><nlm:aff id="AF0001"><institution>Department of Orthopaedics at Danderyd Hospital and Karolinska Institutet</institution>,<addr-line> Department of Clinical Sciences at Danderyd Hospital (KIDS)</addr-line>,<country> Stockholm</country></nlm:aff><wicri:noCountry code="nlm country"> Stockholm</wicri:noCountry></affiliation></author><author><name sortKey="Stark, Andre" sort="Stark, Andre" uniqKey="Stark A" first="André" last="Stark">André Stark</name><affiliation><nlm:aff id="AF0001"><institution>Department of Orthopaedics at Danderyd Hospital and Karolinska Institutet</institution>,<addr-line> Department of Clinical Sciences at Danderyd Hospital (KIDS)</addr-line>,<country> Stockholm</country></nlm:aff><wicri:noCountry code="nlm country"> Stockholm</wicri:noCountry></affiliation></author><author><name sortKey="Muren, Olle" sort="Muren, Olle" uniqKey="Muren O" first="Olle" last="Muren">Olle Muren</name><affiliation><nlm:aff id="AF0001"><institution>Department of Orthopaedics at Danderyd Hospital and Karolinska Institutet</institution>,<addr-line> Department of Clinical Sciences at Danderyd Hospital (KIDS)</addr-line>,<country> Stockholm</country></nlm:aff><wicri:noCountry code="nlm country"> Stockholm</wicri:noCountry></affiliation></author><author><name sortKey="Martinez Carranza, Nicolas" sort="Martinez Carranza, Nicolas" uniqKey="Martinez Carranza N" first="Nicolas" last="Martinez-Carranza">Nicolas Martinez-Carranza</name><affiliation><nlm:aff id="AF0002"><institution>Department of Orthopaedics</institution>,<addr-line> Karolinska University Hospital, Stockholm and Karolinska Institutet, Department of Clinical Sciences, Intervention and Technology (CLINTEC)</addr-line>,<country> Stockholm</country></nlm:aff><wicri:noCountry code="nlm country"> Stockholm</wicri:noCountry></affiliation></author><author><name sortKey="Ryd, Leif" sort="Ryd, Leif" uniqKey="Ryd L" first="Leif" last="Ryd">Leif Ryd</name><affiliation wicri:level="1"><nlm:aff id="AF0003"><institution>Episurf Medical AB</institution>,<addr-line>Stockholm</addr-line>,<country>Sweden</country>.</nlm:aff><country xml:lang="fr">Suède</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author></analytic><series><title level="j">Acta Orthopaedica</title><idno type="ISSN">1745-3674</idno><idno type="eISSN">1745-3682</idno><imprint><date when="2014">2014</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><sec><title>Background and purpose</title><p>Articular resurfacing metal implants have been developed to treat full-thickness localized articular cartilage defects. Evaluation of the fixation of these devices is mandatory. Standard radiostereometry (RSA) is a validated method for evaluation of prosthetic migration, but it requires that tantalum beads are inserted into the implant. For technical reasons, this is not possible for focal articular resurfacing components. In this study, we therefore modified the tip of an articular knee implant and used it as a marker for RSA, and then validated the method.</p></sec><sec><title>Material and methods</title><p>We modified the tip of a resurfacing component into a hemisphere with a radius of 3 mm, marked it with a 1.0-mm tantalum marker, and implanted it into a sawbone marked with 6 tantalum beads. Point-motion RSA of the “hemisphere bead” using standard automated RSA as the gold standard was compared to manual measurement of the tip hemisphere. 20 repeated stereograms with gradual shifts of position of the specimen between each double exposure were used for the analysis. The tip motion was compared to the point motion of the hemisphere bead to determine the accuracy and precision.</p></sec><sec><title>Results</title><p>The accuracy of the manual tip hemisphere method was 0.08–0.19 mm and the precision ranged from 0.12 mm to 0.33 mm.</p></sec><sec><title>Interpretation</title><p>The accuracy and precision for translations is acceptable when using a small hemisphere at the tip of a focal articular knee resurfacing implant instead of tantalum marker beads. Rotations of the implant cannot be evaluated. The method is accurate and precise enough to allow detection of relevant migration, and it will be used for future clinical trials with the new implant.</p></sec></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Adell, R" uniqKey="Adell R">R Adell</name></author><author><name sortKey="Lekholm, U" uniqKey="Lekholm U">U Lekholm</name></author><author><name sortKey="Rockler, B" uniqKey="Rockler B">B Rockler</name></author><author><name sortKey="Branemark, Pi A" uniqKey="Branemark P">PI. 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Ödquist</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Valstar, Er" uniqKey="Valstar E">ER Valstar</name></author><author><name sortKey="Vrooman, Ha" uniqKey="Vrooman H">HA Vrooman</name></author><author><name sortKey="Toksvig Larsen, S" uniqKey="Toksvig Larsen S">S Toksvig-Larsen</name></author><author><name sortKey="Ryd, L" uniqKey="Ryd L">L Ryd</name></author><author><name sortKey="Nelissen, Rg" uniqKey="Nelissen R">RG Nelissen</name></author><author><name sortKey="Digital Automated Rsa Compared To Manually Operated, Rsa J" uniqKey="Digital Automated Rsa Compared To Manually Operated R">RSA. J Digital automated RSA compared to manually operated</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Valstar, Er" uniqKey="Valstar E">ER Valstar</name></author><author><name sortKey="Gill, R" uniqKey="Gill R">R Gill</name></author><author><name sortKey="Ryd, L" uniqKey="Ryd L">L Ryd</name></author><author><name sortKey="Flivik, G" uniqKey="Flivik G">G Flivik</name></author><author><name sortKey="Borlin, N" uniqKey="Borlin N">N Borlin</name></author><author><name sortKey="K Rrholm, J" uniqKey="K Rrholm J">J Kärrholm</name></author></analytic></biblStruct></listBibl></div1></back></TEI><affiliations><list><country><li>Suède</li></country></list><tree><noCountry><name sortKey="Eisler, Thomas" sort="Eisler, Thomas" uniqKey="Eisler T" first="Thomas" last="Eisler">Thomas Eisler</name><name sortKey="Martinez Carranza, Nicolas" sort="Martinez Carranza, Nicolas" uniqKey="Martinez Carranza N" first="Nicolas" last="Martinez-Carranza">Nicolas Martinez-Carranza</name><name sortKey="Muren, Olle" sort="Muren, Olle" uniqKey="Muren O" first="Olle" last="Muren">Olle Muren</name><name sortKey="Skoldenberg, Olof" sort="Skoldenberg, Olof" uniqKey="Skoldenberg O" first="Olof" last="Sköldenberg">Olof Sköldenberg</name><name sortKey="Stark, Andre" sort="Stark, Andre" uniqKey="Stark A" first="André" last="Stark">André Stark</name></noCountry><country name="Suède"><noRegion><name sortKey="Ryd, Leif" sort="Ryd, Leif" uniqKey="Ryd L" first="Leif" last="Ryd">Leif Ryd</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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