Dislocation, Muscle Degeneration, Total Hip Arthroplasty
Conditions
Keywords
Total Hip Arthroplasty, Muscle Fatty Degeneration, CT, Gluteal Muscles
Brief summary
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.
Interventions
DIAGNOSTIC_TESTDislocation
One episode of total hip dislocation diagnozied on Xray within 2 years of surgery
DIAGNOSTIC_TESTNo dislocation
No experience of dislocation within two years post-surgery
Sponsors
Centre Hospitalier Universitaire de Nīmes
Study design
Observational model
CASE_CONTROL
Time perspective
RETROSPECTIVE
Eligibility
Sex/Gender
ALL
Healthy volunteers
No
Inclusion criteria
* primary THA with preoperative CT-scan
Exclusion criteria
* malposition of acetabular implants outside the Lewinneck safe zone, * neurological or cognitive disorders, * associated spinal pathologies (within the context of a hip-spine syndrome), * chronic alcoholism, * aseptic osteonecrosis, * revision surgeries, * late dislocations attributed to polyethylene wear, * replacement following post-traumatic coxarthrosis due to acetabulum injuries. * diameters of the prosthetic heads ≠ 32mm
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Mean Attenuation Ratio | The CT scan of the pelvis used to plan the operation is performed between one and two months before the surgery. | 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. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Cross-Sectional Area | The CT scan of the pelvis used to plan the operation is performed between one and two months before the surgery. | The cross-sectional area (CSA), measured in square centimeters (cm²) defines the average muscle surface area. |
| Intramuscular Fatty Fraction | The CT scan of the pelvis used to plan the operation is performed between one and two months before the surgery. | 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. |
Countries
France
Outcome results
None listed