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Active patellar tracking measurement: a novel device using ultrasound
Yi-Fen Shih1, Anthony M J Bull, Alison H McGregor
1Mechanical Engineering Department, Imperial College, London, England.
The American Journal of Sports Medicine
|July 21, 2004
Summary
This study introduces a new ultrasound technique to measure dynamic patellar tracking, showing good reproducibility and accuracy. The method accurately captures patellar movement during various activities, aiding in understanding patellar instability.
Area of Science:
- Biomechanics
- Medical Imaging
- Orthopedics
Background:
- Patellar instability affects many patients and may stem from temporary patellar tracking issues.
- Accurate measurement of patellar movement is crucial for diagnosis and treatment.
Purpose of the Study:
- To develop and validate a novel ultrasound-based technique for measuring dynamic patellar tracking.
- To assess the reproducibility and accuracy of this new measurement method.
Main Methods:
- A functional knee brace was modified with an ultrasound transducer to track patellar mediolateral position.
- Ultrasound measurements were taken parallel to the femoral transepicondylar axis.
- Ten healthy subjects were studied during sitting, squatting, and stepping activities.
Main Results:
- The ultrasound technique demonstrated good interobserver and intraobserver reproducibility (0.2-1.0 mm).
- Measurement accuracy, validated against MRI, was 0.6 +/- 1.9 mm.
- Distinct patellar tracking patterns were observed during sitting (medial then lateral translation) versus squatting/stepping (more lateral path).
Conclusions:
- The novel ultrasound method provides a reproducible and accurate means to measure dynamic patellar tracking.
- This technique shows promise for clinical applications in diagnosing and managing patellar instability.
- Preliminary data reveal unique patellar paths during common daily activities.