Insall proximal realignment with/without tibial tubercle osteotomy for recurrent patellar instability yields acceptable medium- to long-term results but risk of osteoarthritis progression is considerable

Journal of Experimental Orthopaedics

Table 4 Patellofemoral anatomical features on radiographs and MRIs^a

	n^b	%
Patellas morphology	44
Wiberg 1		0
Wiberg 2		27.3
Wiberg 3		65.9
“Jägerhut”		6.8
Oswestry -Bristol classification of trochlear dysplasia	44
Normal		2.3
Mild		34.1
Moderate		36.4
Severe		27.3
Lateral trochlear inclination angle	44
≤ 11 degrees		65.9
TT-TG distance	43
≥ 15 mm		58.1
Caton - Deschamps Index	43
> 1.2		53.5
Patellotrochlear Index	43
< 18%		2.3

^aOBC Oswestry Bristol Classification, LTI Lateral trochlear inclination, TT-TG Tuberositas tibia-trochlear groove. ^bNumber of knees evaluated