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Inversion of the acetabular labrum causes increased localized contact pressure on the femoral head: a biomechanical study
- Source :
- International Orthopaedics. 43:1329-1336
- Publication Year :
- 2018
- Publisher :
- Springer Science and Business Media LLC, 2018.
-
Abstract
- Although studies suggest that subchondral insufficiency fracture of the femoral head may cause rapidly progressive osteoarthritis of the hip, the mechanism of that relationship remains unclear. Our biomechanical study aimed to provide more data in this area by quantifying pressure distribution on the femoral head for normal and inverted hips and by determining the effects of labral inversion on pressure distribution across the joint, focusing on types of fracture under load. We tested mid-sized fourth-generation composite femurs at 15° of adduction, and applied 1 mm/min of axial compressive force to the femoral heads until failure. Additionally, single loads (3000 N) were applied using Prescale film to investigate pressure distribution on the femoral head, with or without silicone rubber representing entrapment of an inverted acetabular labrum. In tests with an external load of 3000 N, the mean pressure for 10 × 5 mm of silicone rubber was 11.09 MPa, significantly greater (about 5.7-fold) than 1.94 MPa without silicone rubber. Different fracture patterns were observed with and without the 10 × 5 mm silicone rubber; when the 10 × 5 mm silicone rubber specimens were used, all eight cases showed fractures in the anterior femoral head. When silicone rubber representing an inverted acetabular labrum was placed between a hemispherical metallic platen and a composite bone model, the silicone rubber areas were subjected to extreme concentration of stress. The fractures that developed at the silicone rubber areas clearly represented subchondral fractures of the femoral head, rather than fractures of the femoral neck.
- Subjects :
- Cartilage, Articular
medicine.medical_specialty
Fractures, Stress
Osteoarthritis
Silicone rubber
complex mixtures
03 medical and health sciences
chemistry.chemical_compound
Femoral head
0302 clinical medicine
Cadaver
Insufficiency fracture
medicine
Humans
Orthopedics and Sports Medicine
Femoral neck
030203 arthritis & rheumatology
Orthodontics
030222 orthopedics
business.industry
Acetabular labrum
technology, industry, and agriculture
Acetabulum
Femur Head
medicine.disease
medicine.anatomical_structure
chemistry
Orthopedic surgery
Hip Joint
Surgery
business
Contact pressure
Subjects
Details
- ISSN :
- 14325195 and 03412695
- Volume :
- 43
- Database :
- OpenAIRE
- Journal :
- International Orthopaedics
- Accession number :
- edsair.doi.dedup.....9c384063dd9fadbc9a731d68b21c3a48