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Kroon de KE, Houterman S, Janssen RPA
The Knee 2012;19:270–274
Analysis of long leg alignment as well as tibial slope after minimal invasive total knee arthroplasty (MIS-TKA) comparing intra- and extramedullary minimal invasive surgery (MIS) tibia instrumentation (Genesis II, Smith & Nephew, Memphis, USA). A prospective randomized study was performed according to the CONSORT guidelines (n=56 patients). All measurements of alignment and tibial slope were made on standardized long leg standing X-rays as well as lateral knee X-rays performed preoperatively and 4-12 months post surgery. Long leg alignment was defined as being within or outside the range of 3 degrees varus-valgus on the mechanical axis of the leg. The tibial slope was compared pre and post surgery. Leg alignment was not significantly different after MIS-TKA with intra- or extramedullary tibial instrumentation. Restoration of the tibial slope was significantly better with use of the extramedullary tibial instrumentation.