Document Type : Original Articles
Authors
- Nasim Rashedi 1
- Bina Eftekharsadat 2
- Neda Dolatkhah 2
- Jafar Soleymanpour 3
- Yaghoub Salekzamani 2
- Soraya Babaie 2
1 Faculty of Medicine and Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran
2 Physical Medicine and Rehabilitation Research Center, Aging Research Institute, Tabriz University of Medical Sciences, Tabriz, Iran
3 Department of Orthopedics Surgery, Shohada Teaching Hospital, Tabriz University of Medical Sciences, Tabriz, Iran
Abstract
Background: Photogrammetry is a safe and non-invasive technique for evaluating posture in clinical settings. Body vision is a novel system that employs photogrammetric principles to assess postural parameters. This study aimed to determine the relationship between clinical, photogrammetric, and radiologic techniques in knee angular deformity detection.
Methods: This cross-sectional study was performed on 53 volunteers of both genders, with a total of 106 lower limbs with complaints of knee pain or knee deformity. Sampling was conducted in a non-random and accessible manner considering the inclusion and exclusion criteria. Moreover, all of the participants had previously full-length lower limb radiographs. The clinical evaluation was conducted through the measurement of the anatomical axis, Q angle, and intermalleolar and intercondylar distances. The aforementioned parameters were evaluated using the Body Vision photogrammetric system while the patient was in a standing position. Finally, the analysis was performed using angles and distances obtained from these methods.
Results: The evaluations indicated a strong correlation between the photogrammetric and radiological methods regarding the anatomical axis of the lower limb (r=0.939, p<0.001). Moreover, a high correlation was obtained between the clinical and photogrammetric methods to the intermalleolar distance (r=0.948, p<0.001) and intercondylar distance (r=0.927, p<0.001). Regarding the Q angle, a high but relatively lower correlation was detected between the clinical and photogrammetric methods compared to the previous cases (r=0.834, p<0.001). However, a moderate correlation has been detected from the clinical measurement of the anatomical axis with photogrammetric and radiological methods (r= 0.70, r= 0.62 respectively).
Conclusions: As a result of this study, a strong correlation was demonstrated between the photogrammetric technique and the gold standard method, indicating that photogrammetry can be used as an alternative method for evaluating knee angular deviations.
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