The calculator in question is the ASBMR criteria for atypical femoral fractures. ASBMR stands for the American Society for Bone and Mineral Research. This calculator is used to identify and diagnose atypical femoral fractures in patients, particularly those who have been on long-term bisphosphonate therapy for conditions like osteoporosis. 

The ASBMR criteria are applied to patients who present with femoral fractures that do not fit the typical pattern of osteoporotic fractures. The clinical utility of this calculator is to help clinicians differentiate between typical osteoporotic femoral fractures and atypical fractures, which may require different management strategies. 

Exclusion criteria for the use of the ASBMR criteria include patients with pathological fractures due to primary or metastatic bone tumors, as well as those with periprosthetic fractures. The criteria should also not be used in patients with typical osteoporotic femoral neck or intertrochanteric fractures.

ASBMR criteria for atypical femoral fractures

# Criteria
 A. Fracture is associated with minimal or no trauma, as in a fall from a standing height or less (+1)
B. Fracture line originates at the lateral cortex and is substantially transverse in its orientation, although it may become oblique as it progresses medially across the femur (+1)
C. Complete fracture extends through both cortices and may be associated with a medial spike; incomplete fractures involve only the lateral cortex (+1)
D. Fracture is noncomminuted or minimally comminuted (+1)
E. Localized periosteal or endosteal thickening of the lateral cortex - “beaking” or “flaring” - present at the fracture site (+1)

# Conditions
- score >= 4
- true
- score == 0