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Kinematic analysis of spinal fusions
Investigative Radiology
|May 1, 1976
Summary
Roentgen stereophotogrammetric analysis detected pseudarthrosis, or failed fusion, in two cases of suspected incompletely healed anterior fusion between the L5 and S1 vertebrae. This advanced imaging method precisely measures spinal instability.
Area of Science:
- Orthopedics
- Biomedical Engineering
- Radiology
Background:
- Anterior fusion of the L5-S1 vertebrae is a common spinal procedure.
- Incomplete healing can lead to pseudarthrosis, causing pain and instability.
- Accurate detection of failed fusion is crucial for patient outcomes.
Purpose of the Study:
- To evaluate the efficacy of roentgen stereophotogrammetric analysis (RSA) in diagnosing pseudarthrosis after L5-S1 anterior fusion.
- To assess the precision of RSA in detecting subtle spinal motion.
Main Methods:
- Two patients with suspected pseudarthrosis underwent examination using RSA.
- RSA involves high-precision roentgenograms to measure intervertebral micromotions.
- Analysis focused on detecting rotational and translational movements between L5 and S1.
Main Results:
- Pseudarthrosis was confirmed in both examined cases.
- RSA demonstrated high accuracy, detecting rotations within 0.2 degrees and translations between 30-120 micrometers.
- The method successfully identified motion indicative of failed fusion.
Conclusions:
- Roentgen stereophotogrammetric analysis is a highly accurate method for diagnosing pseudarthrosis after L5-S1 anterior fusion.
- RSA's precision allows for the detection of subtle instability, aiding in the management of failed spinal fusions.