Table 2.

Radiographic and operative information

Variable	Count (%) or mean ± standard deviation
N	70
Radiographic characteristics
TT-TG distance on MRI (mm)	17.2 ± 3.9
TT-TG distance > 15 mm	45 (64.3%)
Insall-Salvati ratio on MRI	1.2 ± 0.2
Patellar height	Normal height 30 (42.9%) Patella alta 40 (57.1%)
Dejour classification of trochlear dysplasia	Type A 24 (34.3%) Type B 19 (27.1%) Type C 13 (18.6%) Type D 14 (20.0%)
Treatment course and operative information
Time from symptom onset to initial evaluation (months)	6.4 ± 27.5
Time from symptom onset to surgery (months)	73.6 ± 104.7
Procedure laterality	Left 32 (45.7%)|Right 38 (54.3%)
Graft type	Gracilis 65 (92.9%)|Semitendinosus 5 (7.1%)
Had concomitant procedure	45 (64.3%)
Tibial tubercle osteotomy	36 (51.4%)
Meniscectomy	2 (2.9%)
Chondroplasty	30 (42.9%)
Loose body removal	10 (14.3%)

TT-TG tibial tubercle-to-trochlear groove, MRI magnetic resonance imaging