Therefore, the target alignment is neutral mechanical alignment, with an acceptable range of 3° varus to 3° valgus. Berend et al(10) investigated tibial component failure mechanisms, noting that malalignment of the tibial component in
more than 3° of varus increased the odds of failure. Intramedullary and extramedullary alignment systems have improved postoperative alignment results(11,12).Unfortunately, there are limitations in the use of the systems in obesity, postfracture deformity, narrow canals, severe bowing, and after total hip arthroplasty,as well as continued difficulty in achieving consistently accurate alignment.
Therefore, the target alignment is neutral mechanical alignment, with an acceptable range of 3° varus to 3° valgus. Berend et al(10) investigated tibial component failure mechanisms, noting that malalignment of the tibial component in
more than 3° of varus increased the odds of failure. Intramedullary and extramedullary alignment systems have improved postoperative alignment results(11,12).Unfortunately, there are limitations in the use of the systems in obesity, postfracture deformity, narrow canals, severe bowing, and after total hip arthroplasty,as well as continued difficulty in achieving consistently accurate alignment.
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