Genu Varus and Valgus Quantification
| Purpose | Assess presence and quantify degree of genu varus or valgus |
| Tag(s) | Limb length, leg length, discrepancy, lower extremity, scanogram |
| Panel | Musculoskeletal Panel |
| Define-AI | 19050030 |
| Originator | David Sandman |
| Lead | David Sandman |
| Panel Chair | Jay Patti |
| Panel Reviewers | Musculoskeletal Panel |
| License | Creative Commons 4.0 |
| Status | Public Commenting |
| RadElement Set | RDES106 |
Clinical Implementation
Value Proposition
Malalignment of the knee, either genu varus or valgus, can have clinical implications in both the pediatric and adult populations. Measuring the lower extremity alignment can be a tedious, time-consuming task and prone to both intra-reader and inter-reader variability. Automated measurements of the lower extremities can provide an accurate and reproducible measuring technique and result.Narrative(s)
65 year old male with severe lateral compartment osteoarthritis of the left knee. Total knee arthroplasty is planned, goals of which include attaining physiologic alignment. Weightbearing long-leg/lower extremity radiographs are ordered as part of the preoperative work-up. An algorithm measures the alignment at the knee, auto-populating the data when a radiologist or other clinician reviews the study.Workflow Description
Images obtained from the radiography unit 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.Considerations for Dataset Development
|
Procedures(s) |
{Standing/weightbearing long-leg/lower extremity radiographs} |
|
View(s) |
{Upright/standing-radiographs} |
|
Sex at Birth |
{Male,Female} |
|
Age |
[0,90] |
Technical Specifications
Inputs
DICOM Study
|
Procedure |
Standing/weightbearing long-leg/lower extremity radiographs |
|
Views |
AP Views |
|
Data Type |
DICOM |
|
Modality |
Radiograph |
|
Body Region |
Lower Extremity |
|
Anatomic Focus |
Hip, thigh, knee, leg , ankle |
Primary Outputs
Bilateral qualitative alignment of the knee
|
RadElement ID |
RDE686 |
|
Definition |
Genu varus, valgus or normal alignment. Mechanical axis (MA) = line from top of femoral head to mid tibial plafond. If MA medial to intercondylar notch = genu varus. If MA lateral to intercondylar notch = genu valgus. If MA within the intercondylar notch = normal alignment. |
|
Data Type |
Categorical |
|
Value Set |
|
|
Units |
N/A |
Bilateral quantitative alignment of the knee
|
RadElement ID |
RDE684 |
|
Definition |
Measure genu varus or valgus. 1) Mechanical axis of femur (MAF) = line from top of femoral head through intercondylar notch 2) Tibial axis (TA) = line from intercondylar eminence to mid tibial plafond 3) Angle between continuation of MAF to level of tibia and TA |
|
Data Type |
Numeric |
|
Value Set |
N/A |
|
Units |
Degrees |
Related Datasets
No known related public datasets at this time, please us alert us if you know of any.