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Dynamic interfragmentary motion in fractures during routine patient activity
T N Gardner1, M Evans, J Hardy
1Oxford Orthopaedic Engineering Centre, University of Oxford, United Kingdom.
Clinical Orthopaedics and Related Research
|March 1, 1997
Summary
Natural motion in tibial fractures, measured via external fixators, influences healing. Therapeutic exercise can stimulate bone repair, even in non-weight-bearing patients.
Area of Science:
- Orthopedics
- Biomechanics
- Regenerative Medicine
Background:
- Tibial fractures require stabilization for healing.
- Understanding interfragmentary motion is crucial for optimizing fracture repair.
- External fixators allow for motion assessment during patient activity.
Purpose of the Study:
- To measure natural interfragmentary motion in tibial fractures during patient activity.
- To correlate motion measurements with fracture healing.
- To investigate the influence of motion on osteogenic repair processes.
Main Methods:
- Ten patients with diaphyseal tibial fractures stabilized with external fixators were studied.
- Three-dimensional motion was monitored using an instrumented spatial linkage.
- Measurements were taken during walking, standing, and muscle activities at 2 and 4 weeks post-fixation.
Main Results:
- Peak cyclic displacements from flexion/extension were comparable to weight-bearing activity.
- Axial motion varied significantly, with some patients showing >1 mm displacement and others <0.25 mm.
- Transverse shear displacements also showed considerable variation between patients.
Conclusions:
- Natural fracture motion, even during non-weight-bearing activities, can stimulate osteogenic repair.
- Therapeutic exercise may be a viable option for promoting healing in non-weight-bearing patients.
- The range of motion observed suggests varying influences (inhibitory and stimulatory) on fracture healing based on displacement and gap size.