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A retrospective analysis of medial opening wedge high tibial osteotomy for varus osteoarthritic knee

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Background

Medial opening wedge high tibial osteotomy (MOWHTO) has proven to be an effective treatment for varus osteoarthritic knees. Various methods of fixation with different implant types and using either bone grafts or bone substitutes have been reported. We performed non-locking T-buttress plate fixation with autologous iliac bone graft augmentation, which is defined here as the traditional method, and locking compression plate fixation without any bone graft or bone substitute. We aimed to compare bone union and complications of these two MOWHTO techniques.

Materials and Methods

Between June 2005 and December 2007, 50 patients who underwent MOWHTO (a total of 60 knees) were retrospectively reviewed and classified into two groups: group A, which consisted of 26 patients (30 knees) was treated using T-buttress plate fixation with autologous iliac bone graft augmentation and group B, which consisted of 24 patients (30 knees) was operated upon using a medial high tibial locking compression plate without any augmentation. Demographic characteristics and radiographic outcomes, including union rate, time to union, medial osteotomy defects, and complications, were collected and compared between the two groups. The progress of all patients was followed for at least 2 years.

Results

All osteotomies united within 12 weeks after surgery. Group B had slightly longer time to union than group A (10.3 weeks and 9.5 weeks, respectively; P = 0.125). A significantly higher incidence of medial defects after osteotomy was reported in the locking compression plate group (P = 0.001). A total of 5 (8.3%) knees had complications. In group A, one knee had a superficial wound infection and another knee had a lateral tibial plateau fracture without significant loss of correction. In group B, one knee had screw penetration into the knee joint and two knees had local irritation that required the removal of the hardware.

Conclusion

Locking compression plate fixation without the use of bone grafts or bone substitutes provides a satisfactory union rate and an acceptable complication rate when compared to the traditional MOWHTO technique. Thus, we recommend using this technique for treating unicompartmental medial knee osteoarthritis.

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Authors and Affiliations

  1. Department of Orthopedic Surgery, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand

    Chaturong Pornrattanamaneewong, Surin Numkanisorn, Keerati Chareancholvanich &  Thossart Harnroongroj MD

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  1. Chaturong Pornrattanamaneewong
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  2. Surin Numkanisorn
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  4. Thossart Harnroongroj MD
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Correspondence to Thossart Harnroongroj MD.

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Pornrattanamaneewong, C., Numkanisorn, S., Chareancholvanich, K. et al. A retrospective analysis of medial opening wedge high tibial osteotomy for varus osteoarthritic knee. IJOO 46, 455–461 (2012). https://doi.org/10.4103/0019-5413.98833

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