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This study evaluated the clinical, radiological, and functional outcomes of using metaphyseal sleeves to reconstruct bone defects in 175 knees (152 revisions, 23 complex primaries) undergoing TKA. With a mean follow-up of 64.6 months, the study found that metaphyseal sleeves provided reliable fixation, corrected alignment (HKA angle improved from 165.7° to 177.9°), and improved Oxford Knee Scores (19.0 to 34.9). Kaplan-Meier survivorship for revision for any cause was 94% at 5 and 10 years.
Metaphyseal sleeves demonstrate reliable fixation and high survivorship in both revision and complex primary TKA for reconstruction of substantial bone defects.
PURPOSE The purpose of this study was to evaluate the clinical, radiological, and functional outcomes of bone-loss reconstruction in revision and complex primary total knee arthroplasty (TKA) using metaphyseal sleeves. METHODS Between 2009 and 2023, 170 patients (175 knees) who underwent TKA with metaphyseal sleeves were included. Bone defects were classified using the Anderson Orthopaedic Research Institute (AORI) system. Clinical and radiological outcomes were analyzed. RESULTS Of the 175 knees, 152 were revisions and 23 were complex primary procedures, in which 141 tibial and 102 femoral sleeves were used. The mean follow-up was 64.6 months (range, 19 to 185). The prosthesis types included posterior-stabilized (n = 15), semi-constrained (n = 115), rotating hinge (n = 33), and distal femoral replacement (n = 12).The most common defects were AORI Type IIb (80 femoral, 60 tibial), followed by Type IIa (73 tibial, 15 femoral), and Type III (16 femoral, five tibial). Intraoperative fractures occurred in 4.5% of knees (six femoral, two tibial).Prosthesis removal and arthrodesis were required in three knees for deep infection, and one tibial sleeve was revised for aseptic loosening. The mean preoperative hip-knee-ankle (HKA) angle was 165.7° (range, 145 to 191), improving to 177.9° (range, 167.9 to 177.7) postoperatively. The joint line was restored to within five mm of the preoperative level in 152 knees (85%).The mean Oxford Knee Score improved from 19.0 preoperatively to 34.9 postoperatively. Kaplan-Meier survivorship for revision for any cause was 94%, and survivorship for revision for aseptic loosening was 98.4% at both five and 10 years. CONCLUSION Metaphyseal sleeves provide reliable fixation and effective reconstruction of substantial bone defects, both in revision and complex primary TKA, resulting in excellent clinical and radiological outcomes with high implant survivorship.
