描述
Limb Reconstruction System
问&一个
Q1: What is a Limb Reconstruction System (LRS) and what is its primary purpose?
A1: A Limb Reconstruction System is a modular, unilateral external fixation device designed primarily for limb lengthening and complex deformity correction. It uses a single rigid rail and Schanz screws to provide stable fixation while allowing controlled, gradual distraction of bone segments.
Q2: How does the LRS achieve bone lengthening?
A2: Through the biological principle of distraction osteogenesis:
A controlled bone cut (osteotomy) is made.
After a brief latency period, the LRS is gradually distracted (typically 1 毫米每天)
New bone (regenerate) forms in the gap as the bone segments are slowly pulled apart
第三季度: What are the key advantages of an LRS over circular fixators like Ilizarov?
A3:Lower Profile: Less bulky, improving patient comfort and mobility.
Easier Application: Simplified surgical technique with reduced operating time.
Better Soft Tissue Tolerance: Fewer wires reduce muscle transfixion and irritation.
Simpler Adjustment: Primarily designed for straightforward lengthening and uniaxial corrections.
第四季度: How long does the entire lengthening process typically take?
A4: A general rule is the “1 毫米每天” distraction rate, with the consolidation phase requiring approximately 30-45 days per centimeter of lengthening. For example, a 5 cm lengthening may require 6-9 months of total fixator time.
Q5: What is the role of physical therapy during limb lengthening?
A5: Physical therapy is critical to maintain joint range of motion, prevent muscle contractures, and strengthen the limb. Patients must perform exercises multiple times daily throughout the distraction and consolidation phases.
Q6: How is patient compliance monitored during the lengthening process?
A6: Compliance is monitored through:
Regular clinical visits (每一个 2-4 weeks)
Radiographic assessment of bone regenerate quality
Measurement of distraction progress
Assessment of joint mobility and functional status
Q7: What are the indications for using an LRS over other fixation methods?
A7: LRS is particularly indicated for:
Limb length discrepancies (>3 cm)
Post-traumatic bone defects
Diaphyseal deformities requiring correction
Infected nonunions requiring bone transport
Q8: How is the LRS removed after treatment?
A8: Removal is a surgical procedure performed when:
Radiographs show corticalization of regenerated bone
The patient can bear full weight without pain
There is evidence of mature bone formation across the regenerate site
