Metaphyseal dysplasia

Metaphyseal Dysplasia

Diagram illustrating autosomal recessive inheritance.

Metaphyseal dysplasia, also known as Pyle's disease, is a rare genetic disorder that affects the metaphysis of the long bones. It is characterized by abnormal bone development, particularly in the metaphyseal regions, leading to a range of skeletal abnormalities.

Etiology

Metaphyseal dysplasia is primarily inherited in an autosomal recessive pattern, meaning that an individual must inherit two copies of the defective gene, one from each parent, to manifest the disease. The specific genetic mutations responsible for this condition are not fully understood, but they result in defective bone remodeling and growth.

Clinical Features

Patients with metaphyseal dysplasia typically present with:

• Widening of the metaphyses of long bones, particularly in the femur and tibia.
• Bowing of the legs, which may lead to genu varum or genu valgum.
• Short stature due to impaired growth of the long bones.
• Increased risk of fractures due to bone fragility.

Diagnosis

Diagnosis of metaphyseal dysplasia is based on clinical evaluation, family history, and radiographic findings. X-rays typically show:

• Widened metaphyses with a "Erlenmeyer flask" appearance.
• Cortical thinning and reduced bone density.

Management

There is no cure for metaphyseal dysplasia, and treatment is primarily supportive. Management strategies include:

• Orthopedic interventions to correct bone deformities and improve function.
• Physical therapy to enhance mobility and strength.
• Monitoring for potential complications such as fractures.

Prognosis

The prognosis for individuals with metaphyseal dysplasia varies depending on the severity of the condition. While the disorder can lead to significant skeletal deformities, many individuals can lead relatively normal lives with appropriate management.

Related Pages

• Osteogenesis imperfecta
• Achondroplasia
• Skeletal dysplasia