Table 3. Literature studies showing the relationship between cortical thickness measured in different anatomical regions and bone mineral densitometry.

Study	Year	Anatomic region	Measurement type	Critical value for low BMI
Tingart et al.[21]	2003	Proximal humerus	CCT	CI <4 mm
Sah et al.[18]	2007	Femur diaphysis	CTI	CTI <0.40
Rodriguez-Soto et al.[17]	2010	Femoral neck	CTI	Unspecified
Spross et al.[20]	2015	Proximal humerus	DTI	DTI <1.4
Webber et al.[22]	2015	Distal radius	BCT	BCT <5 mm
Baumgärtner et al.[14]	2015	Proximal femur	CTI	Unspecified
Patterson et al.[16]	2016	Distal tibia	CBT (AP and Lat)	CT (AP) <3.5 mm
He et al.[15]	2018	Distal femur	CBT and DFCI	CBT <4.4 mm and DFCI <1.10 mm
Schmidutz et al.[19]	2021	Distal radius	CI	Unspecified
Yoshii et al.[23]	2021	3rd metacarpal bone	CTR	Unspecified
BMI: Body mass index; CCT: Combine cortical thickness; CI: Cortical index; CTI: Cortical thickness index; DTI: Deltoid tuberosity index; BCT: Bicortical thickness; CBT: Cortical bone thickness; AP: Anterior posterior; Lat: Lateral; DFCI: Distal femoral cortical index; CT: Cortical thickness; CTR: Cortical thickness ratio.