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Table 3 The angle between the original AP axis (AP1, AP2) and 0°AP axis

From: Study on the morphological characteristics and rotational alignment axis of placement plane of the tibial component in total knee arthroplasty for hemophilia-related knee arthritis

Angle HA group(n = 40)
Mean ± SD(range)
OA group(n = 42)
Mean ± SD (range)
t P-value
The angle between 1/3MPT axis and 0°AP axis + 9.26° ± 6.31° (− 1.71°, + 27.05°) + 3.15° ± 5.62° (− 13.68°, + 16.34°) 4.626 0.000
The angle between 1/3MTT axis and 0°AP axis + 13.02° ± 7.18° (− 7.00°, + 25.19°) + 6.42° ± 5.44° (− 8.42°, + 16.85°) 4.702 0.001
  1. The original 1/3MPT axis and 1/3MTT axis external rotation was set to + and internal rotation to—relative to the 0°AP axis
  2. HA: Hemophiliac Arthritis, OA: Osteoarthritis, SD: Standard Deviation, 1/3MPT: the medial one-third of the patellar tendon, 1/3MTT: the medial one-third of the tibial tubercle