• Boonchana Pongcharoen, Boonchna Pongcharoen, Thanasak Yakampor, and Keerati Charoencholvanish.
• Department of Orthopaedic Surgery, Faculty of Medicine, Thammasat University Thailand, 95 moo8 Klong, Klongluang, Patumthani, 12120, Thailand. boonbigbear@hotmail.com
• Clin. Orthop. Relat. Res. 2013 May 1;471(5):1654-60.

BackgroundSince the medial parapatellar (MPP) approach in conventional TKA can cause patellar maltracking and anterior knee pain, some orthopaedic surgeons use the midvastus (MV) approach instead of the MPP approach to reduce patellar maltracking. Minimally invasive surgical (MIS) TKA has been developed to limit the damage to the surrounding muscle and reduce the necessity of patellar eversion during surgery. Thus, MIS TKA might be associated with proper patellar tracking and a low incidence of anterior knee pain. However, this presumption has not been confirmed.Questions/PurposesWe asked whether the incidence of patellar maltracking and anterior knee pain differed with the MV and MPP in association with MIS TKA.MethodsWe prospectively followed 59 patients (60 knees) treated with 60 primary cemented MIS TKAs from August 2009 to September 2010. We randomized the patients into two groups: 30 who had a limited MPP approach and 30 who had a mini-MV approach. We recorded the occurrence of anterior knee pain, patellar tilting, and subluxation. The minimum followup was 12 months (mean, 18.03 months; range, 12.00-25.08 months).ResultsWe found no differences in anterior knee pain (two of 30, 7% versus two of 30, 7%), mean patellar tilt (3.4º ± 2.9º versus 3.0 ± 2.3º), and mean patellar subluxation (1.5 ± 1.1 mm versus 1.1 ± 0.7 mm) between the limited MPP and mini-MV groups, respectively.ConclusionsMIS TKA using either the MPP or MV approach has a low incidence of patellar maltracking and anterior knee pain.

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