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Tantalum metaphyseal cones show good osseointegration at short-term follow-up
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In patients undergoing revision total knee arthroplasty with porous tantalum metaphyseal cones, researchers in this study found the cones provided an environment for effective bone graft osseointegration, repair of femoral fractures and interdigitation of the cement mantle at 36 months.
“In the short term, porous tantalum metaphyseal cones provided structural support for large femoral and tibial defects,” Manuel Villanueva-Martínez, MD, PhD, and colleagues wrote in the study abstract.
Villanueva-Martínez and colleagues inserted the cones in 21 patients (14 women, 7 men) with an average age of 73.3 years. They implanted femoral cones in 10 patients, double cones in eight patients and single cones in three patients. A rotating hinge prosthesis (RHK, Zimmer; Warsaw, Ind.) was used in 10 patients and a constrained condylar prosthesis (LCCK, Zimmer; Warsaw, Ind.) was used in 11 patients, according to the abstract.
Sixteen revisions were aseptic and there were five reimplantations after sepsis. The revisions included eight stemmed and 13 primary designs. Villanueva-Martínez and colleagues rated 14 knees as F3 and three knees as F2B according to the Andersen Orthopaedic Research Institute bone defect classification system. Defects were rated as T2A in five cases, T2B in three cases and T3 in five cases, according to the abstract.
At 36 months, one revision was removed due to infection. All metaphyseal cones showed osseointegration and Knee Society Scores were excellent in 12 patients, good in five patients, fair in three patients and poor in one patient, according to the abstract.
Disclosure: Villanueva-Martinez has no relevant financial disclosures.
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