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Table 4 Patellofemoral anatomical features on radiographs and MRIsa

From: 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

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