1. Alternating load examinations at 250 N and 500 N in 30 sowbone patellae showed a significantly increased deformation (mean 1.5 mm) in tension belt osteosynthesis, whereas the deformation after i and 2 XS-Nail osteosynthesis showed lowered deformation than the control, non-osteotomised patellae.

2. A flesh eating inflamation of the patellae, spreading slowly to the tibia and fibula, until gangrene kicks in and urgent Amputational surgery is necessary