Reduced head-neck offset in nontraumatic osteonecrosis of the femoral head
| Autor: | Annina Brugger, Thomas Kappe, Heiko Reichel, Christian Billich, Christian R. Fraitzl |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Adult
Male medicine.medical_specialty business.industry Femur Neck Radiography Head neck Femur Head General Medicine medicine.disease Surgery Femoral head medicine.anatomical_structure Femur Head Necrosis Orthopedic surgery medicine Humans Orthopedics and Sports Medicine Female business Femoroacetabular impingement Retrospective Studies |
| Zdroj: | Archives of orthopaedic and trauma surgery. 133(8) |
| ISSN: | 1434-3916 |
| Popis: | Risk factors for nontraumatic osteonecrosis of the femoral head have in common that they trigger intravascular coagulation and thus lead to devascularization of the femoral head. In part of the patients, however, no risk factors seem to be evident. Mechanical reasons contributing to nontraumatic osteonecrosis have not been discussed so far. We hypothesized that recurrent traumatization of the vessels supplying the femoral head by a cam-type mechanism as in femoroacetabular impingement could add to intravascular coagulation. We, therefore, asked whether structural abnormalities at the femoral head-neck junction indicative of such a mechanism could be observed in radiographs of patients with osteonecrosis of the femoral head.The preoperative anteroposterior and lateral radiographs of 77 patients who underwent surgery because of osteonecrosis of the femoral head were retrospectively screened for a reduced head-neck offset by measuring the α-angle. For comparison, the α-angle was measured on anteroposterior and lateral radiographs of 339 control subjects without evident underlying hip pathology.The mean α-angle was 62.8° (SD 18.7°) for anteroposterior and 67.6° (SD 13.2°) for lateral radiographs in patients with nontraumatic osteonecrosis of the femoral head, whereas in control subjects, the mean α-angle was 47.2° (SD 9.6°) (p0.0001) and 47.6° (SD 10.3°) (p0.0001), respectively.A reduced head-neck offset in patients with nontraumatic osteonecrosis of the femoral head may act as a mechanical (co-)factor in developing osteonecrosis of the femoral head. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink