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Total knee replacement with interlocking stems: a preliminary report.

J J Rodrigo·S J Hazelwood·T B Farver·J S Nyman
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Abstract

Revision total knee replacements or primary total knee replacements with large amounts of bone loss frequently require long-stemmed prostheses to stabilize the components. The hypothesis of the current study was that long-stemmed prostheses can be fixed with interlocking screws, provide a successful outcome, avoid extensive stress-shielding, and allow easy revision in the future. Ten patients with a minimum 2-year followup were studied. Outcomes were studied preoperatively and postoperatively using the Short Form-12 questionnaires, physical examinations, and radiographs. Complications were recorded. Ability to do activities of daily living, strenuous work, and sedentary work were recorded on a 10-point analog scale. Results indicated that 80% of stems well-fixed as shown on serial radiographs, functional outcome scores postoperatively improved significantly from preoperatively, pain was improved significantly, and positive bone remodeling without stress-shielding was seen in 80% of patients, but 20% had significant stress-shielding in the metaphysis. Complications included two periprosthetic fractures for which the patients did not require revision surgery, and one infection. Long-stemmed total knee components with interlocking fixation seem to be a reasonable alternative when large bone defects exist in the femur or tibia.

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AdultAgedArthroplasty, Replacement, KneeBone ScrewsHumansKnee ProsthesisMaleMiddle AgedProsthesis DesignReoperationTreatment OutcomeCase ReportsJournal Article

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J J Rodrigo, S J Hazelwood, T B Farver, J S Nyman. 2001. Total knee replacement with interlocking stems: a preliminary report.. https://doi.org/10.1097/00003086-200111000-00017

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