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Purpose. To determine whether the sulcus angle and the lateral to medial facet ratio correlate with patella lateral displacement and tilt in patients without patella instability. Methods. Computed tomography images of the lower limb of 64 patients without known arthropathy were collected. Three-dimensional models of the lower limb with a unified coordinate system were rebuilt by using Mimics software. The sulcus angle, lateral to medial facet ratio, lateral trochlear inclination of the patellar groove, tibial tuberosity-trochlear groove (TT-TG) distance, bisect offset index, and lateral tilt of the patella were measured. Pearson’s correlation test was used to determine the relationship between the aforementioned parameters. Results. Data from 51 patients were analyzed. The sulcus angle was negatively correlated with lateral tilt inclination (p<0.001, r=0.8406) and positively correlated with the bisect offset index (p=0.003, r=0.634) and patellar tilt (p=0.03, r=0.551); the lateral to medial facet ratio was positively correlated with TT-TG distance (p=0.003, r=0.643) and bisect offset index (p=0.026, r=0.559). Conclusion. The sulcus angle and lateral to medial facet ratio of the patellar groove can influence patella tracking in patients with stable knee joints.

biomed research international

Evaluation of the Effect of the Sulcus Angle and Lateral to Medial Facet Ratio of the Patellar Groove on Patella Tracking in Aging Subjects with Stable Knee Joint