The Effect of Sagittal Knee Deformity on Preoperative Measurement of Coronal Mechanical Alignment during Total Knee Arthroplasty
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purpose: The purpose of this prospective study was to determine correlation between coronal mechanical alignment measured on preoperative standing fulllength radiographs and navigation during total knee arthroplasty (TKA) in the presence of an associated sagittal deformity (hyperextension and flexion deformity).Materials and Methods: Coronal mechanical alignment measured on preoperative, standing, fulllength, hiptoankle anteroposterior radiographs was compared with intraoperative measurements recorded with computer navigation in 200 primary navigated TKAs.results: The mean difference in mechanical alignment between the two techniques was significantly greater (p=0.001) in patients with an associated flexion deformity >10° when compared to knees with associated flexion deformity ≤10°; 48% of knees with a flexion deformity >10° had a difference of ≥3° between the fulllength radiograph and navigation alignment measurements. There was a strong correlation between the radiographic and navigation measurement techniques.conclusions: The mean difference in coronal mechanical alignment between the two techniques was significantly higher in patients with an associated flexion deformity >10°. Hence, surgeons should take caution when relying on preoperative fulllength radiographs for determining coronal mechanical alignment in patients with an associated flexion deformity >10° where using navigation may be more reliable.
Abstract
purpose: The purpose of this prospective study was to determine correlation between coronal mechanical alignment measured on preoperative standing fulllength radiographs and navigation during total knee arthroplasty (TKA) in the presence of an associated sagittal deformity (hyperextension and flexion deformity).Materials and Methods: Coronal mechanical alignment measured on preoperative, standing, fulllength, hiptoankle anteroposterior radiographs was compared with intraoperative measurements recorded with computer navigation in 200 primary navigated TKAs.results: The mean difference in mechanical alignment between the two techniques was significantly greater (p=0.001) in patients with an associated flexion deformity >10° when compared to knees with associated flexion deformity ≤10°; 48% of knees with a flexion deformity >10° had a difference of ≥3° between the fulllength radiograph and navigation alignment measurements. There was a strong correlation between the radiographic and navigation measurement techniques.conclusions: The mean difference in coronal mechanical alignment between the two techniques was significantly higher in patients with an associated flexion deformity >10°. Hence, surgeons should take caution when relying on preoperative fulllength radiographs for determining coronal mechanical alignment in patients with an associated flexion deformity >10° where using navigation may be more reliable.
참고문헌 (12)
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