Change of the cross-sectional area of vastus medialis oblique in patients with recurrent patellar dislocation treated by tibial tubercle transfer combined with medial patellofemoral ligament reconstruction on axial CT

Table 3 Comparison of measurement parameters before surgery and at follow-up

Parameters	Before surgery	At follow-up	P value
TT-TG distance	27.91 ± 1.95 mm	12.33 ± 1.07 mm	< 0.001
CSA of VMO (− 5 mm)	473.06 ± 106.32 mm²	562.97 ± 157.90 mm²	< 0.001
CSA of VMO (0 mm)	641.23 ± 188.45 mm²	700.23 ± 177.55 mm²	0.029
CSA of VMO (+ 5 mm)	788.25 ± 238.62 mm²	849.79 ± 180.84 mm²	0.018
CSA/BW (− 5 mm)	7.83 ± 2.52 mm²/kg	9.22 ± 3.54 mm²/kg	< 0.001
CSA/BW (0 mm)	10.48 ± 3.62 mm²/kg	11.42 ± 4.14 mm²/kg	0.020
CSA/BW (+ 5 mm)	12.86 ± 4.65 mm²/kg	13.68 ± 3.86 mm²/kg	0.017

TT-TG tibial tubercle-trochlear groove, CSA of VMO(− 5 mm) the cross-sectional area of vastus medialis oblique at 5 mm below the upper pole of the patella, CSA of VMO(0 mm) the cross-sectional area of vastus medialis oblique at the upper pole of the patella, CSA of VMO(+ 5 mm) the cross-sectional area of vastus medialis oblique at 5 mm above the upper pole of the patella, CSA/BW (− 5 mm) the ratio of cross-sectional area of vastus medialis oblique to body weight at 5 mm below the upper pole of the patella, CSA/BW (0 mm) the ratio of cross-sectional area of vastus medialis oblique to body weight at the upper pole of the patella, CSA/BW (+ 5 mm) the ratio of cross-sectional area of vastus medialis oblique to body weight at 5 mm above the upper pole of the patella

ISSN: 1749-799X