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document
Migration of the acetabular component : effect of cement pressurization and significance of early radiolucency : a randomized 5-year study using radiostereometry . BACKGROUND Cementing technique is a crucial factor in prosthesis fixation . No randomized studies have been published , however , comparing the outcome of conventional fingerpacking with the outcome of pressurization of the cement prior to cup insertion . PATIENTS AND METHODS We randomized 50 THAs to either fingerpacking or sequential pressurization ( including individual pressurization of each anchorage hole ) and followed the patients with RSA for 5 years . The penetration of cement into the anchorage holes was measured on digital radiographs . Postoperative radiolucent lines around the cup were correlated to later RSA results . For clinical evaluation , we used SF-36 and HHS . RESULTS The pressurized group of THAs was more stable regarding changes in inclination . We found no other difference in the migratory behavior . The cement penetration into the anchorage holes was deeper with the pressurization technique than with fingerpacking . For the whole group taken together , there was a strong relation between the presence of radiolucent lines as measured on the postoperative radiograph and later migration observed by RSA at 2 and 5 years . INTERPRETATION Pressurization of the cement produced better cement penetration and increased the cup stability in terms of changes in inclination . Early findings of radiolucent lines can predict later unfavorable cup migration .
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Intervention_Physical
cement pressurization
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Intervention_Physical
fingerpacking
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Intervention_Physical
sequential pressurization
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Outcome_Other
effect of cement pressurization
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Outcome_Other
significance of early radiolucency
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Outcome_Other
radiolucent lines around the cup were correlated to later RSA results
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Participant_Condition
Migration of the acetabular component
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Participant_Condition
significance of early radiolucency
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Participant_Condition
prosthesis fixation
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Participant_Sample-size
50