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Table 1 Data indicating the patella tendon length (IS index), patella position related to joint surface (BP index), Coronal knee alignment (HKA and Joint Ob) and sagittal alignment (MH slope).

From: Open wedge high tibial osteotomy: cause of patellar descent

Mean(range) Preoperation 3-month Latest Fu
IS index 1.02 (0.88-1.25) 1.06 (0.9-1.28) 1.09 (0.8-1.22)
BP index 0.78 (0.64-0.93) 0.55 (0.42-0.67)* 0.59 (0.38-0.78)*
HKA (°) 169.5 (164-175) 184.4 (179-188)* 183.9 (179-187)*
Joint Ob (°) Var 5.5 (2-10)@ Val 7.3 (2-13)* Val 7.7 (4-11)*
MH slope (°) 10.9 (5-15) 10.6 (4-18) 11.8 (8-16)
  1. Var: varus; Val: valgus. Positive value of MH slope indicated posterior slope.
  2. * p < 0.05 when compared with preoperative data. @ p = 0.023 when compared with normal var 3°.