Reliable Alignment in Total Knee Arthroplasty by the Use of an iPod-Based Navigation System

Figure 4

(a) Correlation between radiographic and navigation alignment measurements, shown as Pearson’s correlation. . (b) Correlation between limb axis by X-ray and discrepancy between radiographic and navigation measurements, shown as Pearson’s correlation. . (c) Distribution of the discrepancy between the preoperative mechanical axis by X-ray and the first intraoperatively measured limb axis by the navigation system. . (d) Distribution of the discrepancy between the postoperative mechanical axis by X-ray and the last intraoperatively measured limb axis by the navigation system. .

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