Background Since 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/purposes We asked whether the incidence of patellar maltracking and anterior knee pain differed with the MV and MPP in association with MIS TKA. Methods We prospectively followed 59 patients (60 knees)

Figure 1 A-B: (A) Retrieved titanium-alloy femoral porous-coated surface replacement bisected to show the replacement of bone by an invasive granulamalike tissue. This component failed after 50 months in an active 62-year-old man. (B) Histology of the tissue within the femoral head shows sheets of macrophages and giant cells, many with fine, intracellular metallic or UHMWPE debris. Lymphocytes are rarely seen in theses tissues. (Stain, toloidine blue; original magnification, X60.)

No abstract