J Korean Orthop Assoc.  2008 Jun;43(3):301-307. 10.4055/jkoa.2008.43.3.301.

Navigation versus Radiographic Measurements in the Open-Wedge High Tibial Osteotomy using Computer Assisted Surgery (CAS)

• Bae DK
• Yoon KH
• Song SJ
• Shin MC
• Noh JH

• KMID: 2186445
• DOI: http://doi.org/10.4055/jkoa.2008.43.3.301

Abstract

PURPOSE: To compare the measurements using a navigation system and radiographic measurement in an open wedge high tibial osteotomy under navigation control.
MATERIALS AND METHODS
From July, 2005 to January, 2007, 32 open wedge high tibial osteotomies were performed using a navigation system for osteoarthritis of the knee. The postoperative mechanical axis % (MA%), which is planned on the navigation system, were 62%. The mechanical axis (MA) and MA% were measured on the navigation system. The preoperative and postoperative MA and MA% were measured on the radiographs. The angles measured with the navigation system and radiographs were compared.
RESULTS
On the navigation system, the mean MA before osteotomy was varus 8.8degrees. The mean MA and MA% after fixation were valgus 2.9degrees and 57.7%. On the radiographs, the mean MA was varus 9.7degrees preoperatively and valgus 4.0degrees postoperatively. The mean MA% was 10.2% preoperatively and valgus 64.4% postoperatively. There were positive correlations between the values measured with the navigation system and the radiographs (r>0.5, p<0.001).
CONCLUSION
There were significant correlations between the values measured with the navigation system and radiographs in an open wedge high tibial osteotomy using a navigation system. The correction angle from the navigation system is reliable, predictable and controllable during surgery.

Keyword

Knee; Osteoarthritis; Open wedge high tibial osteotomy; Navigation system

MeSH Terms

Axis, Cervical Vertebra
Knee
Osteoarthritis
Osteotomy
Surgery, Computer-Assisted

Figure

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  Fig. 1 The extent of varus deformity shown on the preoperative ortho-roentgenogram was evaluated by percentile denotation [(b/a)×100]. The figure shows medial deviation of the mechanical axis: (a) width of the tibia plateau and (b) distance from the medial border of the medial tibial condyle to the point at which the mechanical axis intersects the knee joint line.

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