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This study looks at how fat buildup in hip muscles relates to hip osteoarthritis and less favorable recovery after hip replacement surgery. While it is known that weak gluteal muscles might cause problems, it is not yet proven if this specifically leads to hip dislocation after surgery. The goal of this study is to compare fat buildup in gluteal muscles between patients who had a hip dislocation soon after surgery and those who did not.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Dislocation group | Patients who underwent primary total hip arthroplasty with preoperative CT-scan and encountered an episode of dislocation. |
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| Control group | Patients underwent primary total hip arthroplasty with preoperative CT-scan, who did not experience any episodes of dislocation within two years post-surgery, adhering to the previously outlined exclusion criteria (group control). |
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Dislocation | Diagnostic Test | One episode of total hip dislocation diagnozied on Xray within 2 years of surgery |
|
| Measure | Description | Time Frame |
|---|---|---|
| Mean Attenuation Ratio | The mean attenuation ratio (MAR), representing muscle fat degeneration, corresponds to the mean grayscale pixels in the selected area, expressed in Hounsfield Units (HU). Subsequently, the segmentation process was applied, selectively retaining pixels within the range of -30 HU to 150 HU. This range corresponds to muscle fibers and intramuscular fat, effectively excluding extra-fascial fat and bone pixels. | The CT scan of the pelvis used to plan the operation is performed between one and two months before the surgery. |
| Measure | Description | Time Frame |
|---|---|---|
| Cross-Sectional Area | The cross-sectional area (CSA), measured in square centimeters (cm²) defines the average muscle surface area. | The CT scan of the pelvis used to plan the operation is performed between one and two months before the surgery. |
| Intramuscular Fatty Fraction |
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Inclusion Criteria:
Exclusion Criteria:
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Patients following THA at Nimes university hospital
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| CHU Nîmes | Nîmes | Gard | 30900 | France |
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| ID | Term |
|---|---|
| D004204 | Joint Dislocations |
| ID | Term |
|---|---|
| D007592 | Joint Diseases |
| D009140 | Musculoskeletal Diseases |
| D014947 | Wounds and Injuries |
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| No dislocation | Diagnostic Test | No experience of dislocation within two years post-surgery |
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Finally, the intramuscular fatty fraction (IFF) or percentage of intramuscular fat was calculated using the IB Delta Suite plug-in with thresholds of -30/0/150. Pixels below -30 HU and above 150 HU were designated as extra-muscular, while pixels ranging between 0 HU and 150 HU represented muscle fibers. Pixels falling between -30 HU and 0 HU denoted intramuscular fat, constituting the IFF. |
| The CT scan of the pelvis used to plan the operation is performed between one and two months before the surgery. |