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Ultrasonography of the hip for Perthes' disease
F J Linnenbaum1, H Woltering, A Karbowski
1Orthopädische Universitätsklinik, Münster, Federal Republic of Germany.
Insights
Intracapsular hip effusion in early Perthes' disease is identified by ventral capsular distension via ultrasound. This finding aids in diagnosing and managing hip joint effusion in children.
Area of Science:
- Pediatric Orthopedics
- Diagnostic Imaging
- Rheumatology
Background:
- Perthes' disease involves femoral head necrosis, with early intracapsular hip effusion's role unclear.
- Experimental data suggests hip joint tamponade precedes necrosis.
- Identifying early effusion is crucial for timely intervention.
Observation:
- Ultrasonography can detect ventral capsular distension, a key sign of hip joint effusion in children with irritable hip syndrome.
- This noninvasive technique allows for serial follow-up of effusion.
- Severe cases may show hypertrophic synovial tissue on ultrasound.
Findings:
- Ventral capsular distension is a decisive morphological criterion for hip joint effusion.
- Ultrasound can identify persistent effusion, aiding diagnosis confirmation via radiography, scintimetry, or MRI.
- A correlation exists between high intracapsular pressure and hip extension.
Implications:
- Early sonographic diagnosis of "ventral capsular distension along the femoral neck" may impact Perthes' disease prognosis and therapy.
- Treatment involves effusion aspiration, rest, and NSAIDs.
- Immobilization in extension should be avoided due to increased intracapsular pressure.
Abstract:
The incidence of intracapsular hip-joint effusion in the initial stage of Perthes' disease is unknown. Recent experimental data demonstrated intracapsular hip-joint tamponade followed by necrosis of the femoral head. Ultrasonographic screening of children with "irritable hip syndrome" may reveal a ventral capsular distension as the decisive morphological criterion of hip-joint effusion. The patient is treated by aspiration of the effusion, bed rest, and nonsteroidal anti-inflammatory drugs. The noninvasive and nonionizing ultrasonographic technique permits the identification of a persisting hip-joint effusion by consequent serial follow-up. The suspicion of Perthes' disease can be confirmed by radiography, scintimetry, or, moreover, by magnetic resonance. On the other hand, hypertrophic synovial tissue stopping up the articular cavity and producing weak echos can be demonstrated in patients with a severe course of the disease. The importance of the sonographic diagnosis "ventral capsular distension along the femoral neck" for the prognosis and therapy of Perthes' disease should be investigated. Hips with intracapsular effusion should not be immobilized in extension and/or mild traction, as a relation between high intracapsular pressure and the position of the extended hip is known.