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Antecurvation – Definition, Causes and Treatment
Antecurvation refers to an anterior (forward) bending or angular deformity of a bone or body segment, commonly occurring after fractures or as a congenital condition.
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Antecurvation refers to an anterior (forward) bending or angular deformity of a bone or body segment, commonly occurring after fractures or as a congenital condition.
What is Antecurvation?
The term antecurvation derives from Latin (ante = forward, curvatio = bending) and describes an anterior angular deformity of a bone or body segment. In orthopedics and trauma surgery, antecurvation is used to characterize a bony malalignment in which a healed bone or bone fragment is angulated in a forward direction.
Antecurvation can be either congenital (present at birth) or acquired. It most commonly affects the long bones of the extremities, such as the femur (thigh bone), tibia (shin bone), or humerus (upper arm bone).
Causes
Antecurvation may arise from a variety of causes:
- Bone fractures: During the healing process, fracture fragments that are not properly reduced or immobilized may heal in a maligned position, resulting in an antecurvation deformity.
- Congenital malformations: Some bones develop with an anterior angular deformity already present at birth, for example in certain skeletal dysplasias or syndromes.
- Rickets: Severe vitamin D deficiency during childhood leads to softening of the bones, which can result in angular deformities including antecurvation.
- Paget disease of bone: This chronic metabolic bone disease can cause progressive bone deformation and axial malalignment.
- Osteogenesis imperfecta: This hereditary connective tissue disorder is characterized by fragile bones; repeated fractures can lead to antecurvation deformities.
- Bone tumors or cysts: Space-occupying lesions within bone can alter its structural axis.
Symptoms and Clinical Impact
The clinical presentation depends on the location and severity of the deformity:
- Visible deformity of the affected limb or body segment
- Gait disturbances when the lower extremities are affected
- Pain due to altered load distribution and increased stress on joints and soft tissues
- Premature joint degeneration (secondary osteoarthritis) caused by biomechanical overload
- Muscle imbalances and compensatory postural changes in the spine or adjacent joints
- In pronounced tibial antecurvation: secondary changes in the knee and ankle joints
Diagnosis
Antecurvation is diagnosed through clinical examination and imaging:
- Physical examination: Inspection and palpation of the affected body segment, assessment of axial alignment and range of motion
- X-ray imaging: The standard method for visualizing angular deformities; typically performed in two planes (anteroposterior and lateral) to determine the degree and location of the antecurvation
- Computed tomography (CT): Used for complex deformities or preoperative planning
- Full-leg standing radiograph: Used to assess the overall mechanical axis of the lower extremity
Treatment
Treatment depends on the underlying cause, the degree of deformity, and the severity of symptoms:
Conservative Treatment
For mild deformities that cause minimal symptoms, conservative management may be appropriate:
- Physiotherapy to strengthen surrounding musculature
- Orthopedic insoles or assistive devices to compensate for altered load distribution
- Pain management as needed
Surgical Treatment
Significant or symptomatic deformities typically require surgical correction:
- Corrective osteotomy: The bone is surgically cut, repositioned into the correct alignment, and stabilized with plates, screws, or nails. This is the most common surgical procedure for correcting antecurvation.
- Callotaxis / distraction osteogenesis: For cases involving concurrent limb shortening, gradual correction using an external fixator may be performed.
- Intramedullary nailing: Used in selected shaft fractures presenting with antecurvation malalignment.
References
- Niethard, F. U., Pfeil, J., Biberthaler, P.: Duale Reihe Orthopädie und Unfallchirurgie. 8th edition. Thieme Verlag, Stuttgart, 2017.
- Buckwalter, J. A., Einhorn, T. A., Simon, S. R.: Orthopaedic Basic Science. American Academy of Orthopaedic Surgeons, 2000.
- Paley, D.: Principles of Deformity Correction. Springer Verlag, Berlin, 2002.
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