Automated Leg Length Discrepancy Assessment CT Scanogram

Purpose	Quantify the lower extremity limb lengths on CT scanograms
Tag(s)
Panel	Musculoskeletal Panel
Define-AI ID	19050020
Originator	David Sandman
Lead	David Sandman
Panel Chair	Jay Patti
Panel Reviewers	Musculoskeletal Panel
License	Creative Commons 4.0
Status	Public Commenting
RadElement Set	RDES134

                               

Value Proposition

Leg or lower extremity limb length discrepancy is a correctable problem affecting the pediatric and adult populations. Several methods of measuring the lower extremities have been described, each of which is prone to both intra-reader and inter-reader variability and can be a tedious task to complete. Automated measurements of the lower extremities can provide an accurate and reproducible measuring technique and result.

Narrative(s)

65 year old male with severe medial compartment osteoarthritis of the left knee. Total knee arthroplasty is planned, goals of which include attaining limb length equality and physiologic alignment. A CT scanogram is ordered as part of the preoperative work-up. An algorithm measures the lower extremity lengths, auto-populating the data when a radiologist or other clinician reviews the study.

Workflow Description

Images obtained from the CT scanner are sent to PACS and the AI engine. The images are analyzed by AI. Coordinates of areas of interest are assessed using a measuring tool. Annotated measurements are saved as an image along with a summary of the measurement data set (similar to CT radiation dosing data).

Procedures(s)	{CT scanogram}
View(s)	{supine-CT scanogram}
Sex at Birth	{Male,Female}
Age	[0,90]

Inputs

DICOM Study

Procedure	CT scanogram
Views	AP Views
Data Type	DICOM
Modality	CT
Body Region	Lower Extremity
Anatomic Focus	Hip, thigh, knee, leg, ankle

Primary Outputs

Bilateral Lower Extremity Length

RadElement ID	RDE881
Definition	Distance from top of femoral head to mid tibial plafond
Data Type	Numeric
Value Set	N/A
Units	cm

Bilateral Femur Length

RadElement ID	RDE882
Definition	Distance from top of femoral head to medial condyle articular surface
Data Type	Numeric
Value Set	N/A
Units	cm

Bilateral Tibia Length

RadElement ID	RDE883
Definition	Distance from top of tibial intercondylar eminence to the mid-tibial plafond
Data Type	Numeric
Value Set	N/A
Units	cm

Bilateral Bone Length

RadElement ID	RDE884
Definition	Femur length + tibia length
Data Type	Numeric
Value Set	N/A
Units	cm

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