Table 1 Comparison of the preoperative features between iMPFL and MPFL+AMZ groups
|  | iMPFL N = 14 (SD or %) | MPFL+AMZ N = 16 (SD or %) | P value |
|---|---|---|---|
Age | 19.6 (6.3) | 27.8 (11.2) | .023 |
Gender, male/ female | 4 (28.6) / 10 (71.4) | 4 (25.0)/ 12 (75.0) | 1.00 |
Side (L/R) | 8 (57.1) / 6 (42.9) | 8 (50) / 8 (50) | .730 |
Iwano OA grade (0/1/2/3/4), n | 14/0/0/0/0 | 3/9/2/1/1 | <.001 |
Trochlea dysplasia | 8 (57.1) | 16 (100) | .005 |
Dejour classification (A/B/C/D) | 5/2/0/1 | 3/6/0/7 | .162 |
Congruence angle, degree | 32.3 (8.0) | 58.8 (23.1) | <.001 |
Sulcus angle, degree | 140.1 (3.4) | 154.3 (15.8) | .003 |
Tilting angle, degree | 31.4 (7.2) | 50.7 (31.1) | .031 |
ISR | 1.19 (0.17) | 1.19 (0.30) | .938 |
Lateral patella displacement, mm | 15.8 (4.8) | 24.6 (12.5) | .020 |
TT-TG distance, mm | 17.9 (3.0) | 21.0 (3.1) | .010 |