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J Orthop Surg (Hong Kong). 2012 Dec;20(3):353-5.

Radiographic assessment of the safe zone for medial oblique opening wedge high tibial osteotomy.

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

Abstract

PURPOSE:

To compare different cephalocaudal angles of the X-ray beam in measuring internal rotation of the proximal tibia that best demonstrates the safe zone.

METHODS:

10 pairs of embalmed, disarticulated knee joints from 10 cadavers were used. Soft tissues around the proximal tibia and the proximal tibiofibular joint (PTFJ) were dissected to reveal the articular cartilage. A narrow area between the end of the articular cartilage of the posterolateral proximal tibia and of the PTFJ was identified as the safe zone with a U-shape metal used as a radiographic marker. Translation of the proximal tibia was controlled during internal rotation of the proximal tibia. Internal rotation of the proximal tibia that best demonstrated the safe zone (the U-shape metal at its most outermost point) was measured at 0º, 5º, 10º, 15º, 20º, and 25º cephalocaudal angles of the X-ray beam.

RESULTS:

The mean internal rotation of the proximal tibia that best demonstrated the safe zone at 0º, 5º, 10º, 15º, 20º, and 25º cephalocaudal angle of the X-ray beam were 50º, 45º, 37º, 32º, 23º, and 19º, respectively.

CONCLUSION:

The safe zone was best demonstrated with 50º and 45º internal rotation of the proximal tibia at 0º and 5º cephalocaudal angles of the X-ray beam, respectively.

PMID:
23255645
DOI:
10.1177/230949901202000318
[Indexed for MEDLINE]
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