Objective sound wave amplitude measurement generated by a tuning fork. An analysis of its use as a diagnostic tool in suspected femoral neck fractures
The findings suggest that this test may be used as a diagnostic test or screening tool in the assessment of occult hip fractures.
In the study, the authors used a tuning fork with frequency of 128Hz to objectively measure the reduction in sound amplitude in fractured and non–fractured hips.
They looked at the feasibility of using this test as a diagnostic tool for neck of femur fractures.
A total of 20 patients was included in the study, using MRI scan as the standard for comparison of diagnostic findings.
Informed consent was obtained from the patients.
There was a significant difference in the amplitude reduction of the sound waves when comparing normal to fractured hips.
This was 0.9 in normal hips, compared to 0.31 and 0.18 in intra–capsular and extra–capsular fractures, respectively.
The test was 80% accurate at diagnosing neck of femur fractures.