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Published on: September 22, 2020
On the development and course of Legg-Calvé-Perthes disease (LCPD)
Insights
Legg-Calvé-Perthes disease (LCPD) involves femoral head necrosis due to disrupted blood supply. Revascularization may involve temporary bone bridges, but surgery has limited impact on disease progression.
Area of Science:
- Orthopedics
- Pediatric Orthopedics
- Vascular Biology
Background:
- Legg-Calvé-Perthes disease (LCPD) is characterized by avascular necrosis of the femoral head epiphysis, stemming from compromised blood supply.
- Histological findings and reduced bone-seeking isotope uptake in early stages confirm vascular disruption.
- Revascularization processes may involve the formation of temporary epiphyseal bone bridges.
Purpose of the Study:
- To investigate the vascular and structural changes in Legg-Calvé-Perthes disease.
- To evaluate the role of revascularization and bone bridge formation.
- To assess the efficacy of surgical interventions like osteotomy in managing LCPD.
Main Methods:
- Histological examination of affected femoral heads.
- Bone-seeking isotope scintigraphy to assess blood supply.
- Radiographic analysis, including assessment of bone projections.
- Evaluation of animal models of LCPD.
- Analysis of outcomes following partial intertrochanteric osteotomy with internal fixation.
Main Results:
- Evidence suggests vessel penetration of the epiphyseal plate during revascularization, forming temporary bone bridges.
- Radiographs and animal studies support the occurrence of bone projections from the metaphysis to the epiphysis.
- Surgical intervention (osteotomy) did not decisively alter the disease's course.
- Some cases showed enhanced bone reconstitution following surgical treatment.
Conclusions:
- Vascular disturbances are central to LCPD pathogenesis.
- Temporary bone bridges may form during revascularization, evidenced radiographically and experimentally.
- Current surgical approaches have not demonstrated a significant impact on LCPD progression, though some healing enhancement is observed.
Abstract:
LCPD necrosis of the epiphysis of the femoral head takes place as a manifestation of disturbance of the blood supply. This is confirmed by histologic evidence and from the reduced uptake of bone-seeking isotopes in the initial stage. During the ensuing revascularization there are indications that vessels penetrate the epiphyseal plate giving rise to temporary bone bridges between the metaphysis and the epiphysis. This is supported by the demonstration of bone projections from the metaphysis into the epiphysis on radiographs and observations in animal experiments. Partial intertrochanteric osteotomies combined with internal fixation as an attempt to promote revascularization have not had any decisive influence on the course of the disease, although reconstitution seems to be enhanced in some cases.
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