Table 3 

Risk analysis between failure rates with Tscore, body mass index, or combined. 

Variable 
Threshold 
Failure Rate 
Percentage 
PValue 


Tscore 
T ≥ 0 
0/172 
0% 
0.003 


0 > T > 1.5 
2/161 
1.2% 



T ≤ 1.5 
3/40 
8% 



Body mass index (kg/m^{2}) 
< 29 
1/234 
0.4% 
0.05 


≥ 29 
4/139 
2.9% 



Combined 
T < 1.5 & BMI ≥ 29 
3/12 
25% 
< 0.001 


Others 
2/361 
0.6% 



Gross and Liu Journal of Orthopaedic Surgery and Research 2012 7:1 doi:10.1186/1749799X71 