The Varus-Valgus Constrained Knee Implant: Survivorship and Outcomes. September 2016; DOI: 10.1055/s-0036-1593361. Authors: Marcelo Siqueira. Cleveland Clinic The purpose of this study was to estimate the survivorship of the varus-valgus constrained (VVC) knee implants in primary, aseptic, and septic revision total knee arthroplasty (TKA); determine functional outcomes; main modes of failure; and variables associated with increased mechanical failures. In this study, 685 consecutive cases of primary ( n However, implant out-of-plane rotations, user variability, and X-ray acquisition parameters introduce errors in the estimation of the implant varus/valgus estimation. Previous work has explored the accuracy of various imaging modalities in this estimation. Varus-valgus constrained inserts were used at the discretion of each surgeon, but in general, they were used to increase both rotational and varus-valgus stability. Table 1 . Indications for Revision Total Knee Arthroplasty The purpose of this study was to estimate the survivorship of the varus-valgus constrained (VVC) knee implants in primary, aseptic, and septic revision total knee arthroplasty (TKA); determine functional outcomes; main modes of failure; and variables associated with increased mechanical failures. Aims Varus-valgus constrained (VVC) implants are often used during revision total knee arthroplasty (TKA) to gain coronal plane stability. However, the increased mechanical torque applied to the bone-cement interface theoretically increases the risk of aseptic loosening. The valgus knee can present greater challenges of ligament balance in total knee arthroplasty in comparison to varus aligned knees . Restoration of neutral mechanical axis and correct ligament balance are important factors to reduce incidence of complications relating to instability, loosening, premature wear and patella mal-tracking [ 2 - 5 ]. Prostheses with varus-valgus constraint (VVC) are increasingly utilized in primary total knee arthroplasty (TKA) to address coronal malalignment and instability though little is known regarding the association between added constraint and aseptic loosening. We sought to systematically review the literature for reports of VVC in primary TKA and Both complex primary cases and revision TKA often necessitate for a higher degree of constrain than cruciate retaining or postero-stabilized implant design. In the 1970s varus-valgus constrained (VVC) or semi-constrained implants have been developed by Insall and associates from the PS design, which provide varus-valgus stability preserving a fair amount of host bone. Knee varus and valgus deformity, as clinical symptoms manifested in the advanced osteoarthritis, can lead to the abnormal load distribution, further promot-ing the progressive development of osteoarthritis6. We retrospectively analyzed the condition of varus and valgus deformity in full-length X-ray films of
[index] [3839] [3633] [6288] [7200] [3450] [1137] [3506] [1118] [9703] [4840]
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