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A Retrospective Analysis of the Modified Intervastus Approach.

The subvastus (SV) approach is a well-known muscle- and tendon-sparing approach for total knee arthroplasty (TKA), which has been shown in some studies to provide better outcomes in the visual analog pain score (VAS), knee range of motion (ROM), straight-leg raise, as well as faster rehabilitation, compared with the standard medial parapatellar (MP) approach. We previously described a new knee replacement technique known as the modified intervastus (MIV) approach. The MIV approach is a muscle- and tendon-sparing approach that is extensile and simple to perform. It may be used in the majority of complex primary cases and revisions. Here we describe the surgical technique for performing the MIV approach and provide functional outcome measures. A total of 127 patients (mean age, 66.75 years) underwent TKA using the MIV approach with 1-year follow-up. Clinical outcomes were assessed by recording both a VAS and knee ROM preoperatively, and again at several postoperative time points when the length of time required to ambulate independently (without assistive devices) was also measured. The VAS decreased significantly from the preoperative period (3.69 ± 2.22) to postoperative day 1 (3.17 ± 1.97) (P < .05). Although knee ROM decreased 1 week after surgery, the ROM increased by 6 weeks after surgery compared with the preoperative ROM, and the trend continued over the 1-year follow-up. One-third (33%) of patients were able to walk independently (without assistive devices) at 2 weeks and 78% at 8 weeks. The MIV approach to the knee is a muscle- and tendon-sparing approach that offers advantages over the SV approach and may be used for complex primary and revision total knee cases.

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