Periprosthetic Hip Lucency
| Purpose | Measure periprosthetic lucency in the hip |
| Tag(s) | #THA |
| Panel | Musculoskeletal |
| Define-AI ID | 18050010 |
| Originator | Munib Sana |
| Panel Chair | Jay Patti |
| Panel Reviewers | Musculoskeletal Panel |
| License | |
| Status | Published |
Clinical Implementation
Value Proposition
There are 400,000 total hip arthroplasties (THAs) performed annually. Every patient has annual follow-up exams, which can add up to about 100 reads per day for a musculoskeletal radiologist who works with arthroplasty surgeons. Aseptic loosening and adverse local tissue reaction complicate a significant number of THAs and necessitate revision arthroplasty. These are indolent processes that, if not detected early, can lead to osteolysis or extensive tissue necrosis. Findings are not readily apparent on x-ray and require comparison with multiple prior exams to see progression of abnormality over time. AI meeting this use case would help to reduce the false negative rate, patient risk, and medical legal risk for the radiologists. High-risk patients could be screened for elevated serum cobalt levels and sent to MRI for further evaluation. Delay in diagnosis could delay treatment for years.Narrative(s)
A 65-year-old patient presents for annual follow-up THA x-ray. An algorithm evaluates the image and compares this exam with multiple prior exams, if accessible. The algorithm measures periprosthetic lucency. If the measurement is greater than 2 mm, the radiologist is alerted. Otherwise, the measurement displays when called.Workflow Description
The current image and prior hip x-rays are analyzed by an AI engine. The engine measures periprosthetic lucency between the current image and images at least 5 years old or initial post-op film if THA was performed less than 5 years ago.Considerations for Dataset Development
Procedures(s): X-ray, Hip
View(s): {AP, Frog-leg lateral, Cross-table lateral}
Sex at Birth: {Male, Female}
Osteolysis Location: {Gruen Zone 1, Gruen Zone 7, Gruen Zone 8, Gruen Zone 14}
Interval Between Imaging (years): [0,20]
Comorbidities: {Calcar resorption, osteoporosis, subsidence, lucency}
Technical Specifications
Inputs
DICOM Study
| Procedure | XRAY, Hip |
| Views | AP, frog-leg lateral, cross-table lateral |
| Data Type | DICOM |
| Modality | XRAY |
| Body Region | Pelvis |
| Anatomic Focus | Hip |
Primary Outputs
Periprosthetic Lucency
| RadElement ID | |
| Definition | Measure periprosthetic lucency. Alert if greater than 2 mm. |
| Data Type | Numeric |
| Value Set |
|
| Units | mm |
Secondary Outputs
Total Hip Arthroplasty Status
| RadElement ID | |
| Definition | Status of the total hip arthroplasty |
| Data Type | Categorical |
| Value Set | 0–Normal 1–Abnormal 2–Indeterminate |
| Units | N/A |
Related Datasets
No known related public datasets at this time, please us alert us if you know of any.