Mechanical strength of a new plate compared to six previously tested opening wedge high tibial osteotomy implants

Journal of Experimental Orthopaedics

Table 7 Summary of fatigue failure tests

Specimens	Maximal load [N]	Vertical stiffness K_V [N/mm]	Lateral stiffness K_L [N/mm]	Number of cycles	Failure types
TomoFix std. 3	1280	1350	2000	> 60,000	2
TomoFix std. 4	1440	2000	2500	> 80,000	2
TomoFix std. 5	1760	2500	2200	> 120,000	2
PEEKPower 3	1440	2000	2500	> 80,000	2
PEEKPower 4	1280	1950	2140	> 60,000	2
PEEKPower 5	1440	2785	2250	> 80,000	2
iBalance 3	1760	4000	3600	> 120,000	2,4
iBalance 4	1760	3000	3400	> 120,000	2
iBalance 5	1920	3000	2952	> 140,000	2
iBalance 6	1760	3500	2500	> 120,000	1,2
TomoFix sm 3	1280	2200	2000	> 60,000	2,3
TomoFix sm 4	1280	1750	1500	> 60,000	2,3
TomoFix sm 5	1760	2000	2300	> 120,000	1,2
Contour Lock 3	2400	2100	4400	> 200,000	2
Contour Lock 4	1760	2300	2400	> 120,000	2
Contour Lock 5	2400	2700	2600	> 200,000	1,2,3
Activmotion 3	2240	2500	6300	> 180,000	2
Activmotion 4	2240	2500	2900	> 180,000	2
Activmotion 5	1600	2500	4750	> 100,000	2
Activmotion 6	1600	3100	5100	> 100,000	2
FlexitSystem 3	1760	1070	2050	> 120,000	2
FlexitSystem 4	1600	960	1630	> 100,000	2
FlexitSystem 5	1440	950	1580	> 80,000	2
FlexitSystem 6	1920	960	1730	> 140,000	2

Maximal load, vertical & lateral stiffnesses, Min number of cycles (all values prior to failure) and failure types. The values of the groups I to VI were retrieved from our previous studies and reported here for the sake of comparison.