Assessment of spine mobility in patients with ankylosing spondylitis by ultrasound scanning (preliminary data)

Spine involvement in ankylosing spondylitis (AS) resulting in limited mobility requires a search for accurate, quantitatively methods of assessment of the decline of its function and monitoring of its dynamics. One of the promising methods for assessing movements in the spine in AS is ultrasound examination (US).Objective: to determine the relationship between the mobility of the spine measured sonographically, and the activity and functional status of patients with AS.Patients and methods. Spinal ultrasound was performed in 15 patients (10 men and 5 women, mean age 40.8±11.4 years, mean duration of the disease 5.5±3.5 years) with a confirmed diagnosis of AS, admitted to the V.A. Nasonova Research Institute of Rheumatology from April to August 2019. All patients underwent a double examination (at baseline and after 2 weeks) according to a specially developed protocol.Results and discussion. A comparative analysis of the results of sonographic measurements of the distance between the spinous processes of the vertebrae of the studied spine segment at baseline and after 2 weeks revealed a tendency towards an increase in these parameters both in the initial position and during flexion. There was no relationship between age, body mass index, duration of the disease and the distance between the spinous processes in all parts of the spine measured by sonography in initial position and during flexion. Correlation analysis data indicate the presence of a correlation between an increase in the distance between the spinous processes in the cervical and lumbar spine and a decrease in ESR, and i increase in the distance between the spinous processes in the lumbar spine and level of CRP. A weak negative relationship was found between the BASDAI index and the mobility of the spine at the LIV–V level and between sonographic measurements in all segment of the spine and the BASMI index.Conclusion. The sonographic method of determining the mobility of the spine can be recommended in patients with AS, both for initial examination and during follow-up, but it can't substitute the BASMI metrological index. Further research is needed to confirm the findings.

Risk of occult spinal dysraphism based on lumbosacral cutaneous manifestations

Objectives: Occult spinal dysraphism is a congenital failure of fusion of the posterior vertebral arches with intact skin overlying the defect. Lumbosacral cutaneous manifestations are associated with a variable risk of occult spinal dysraphism. Tethered cord syndrome is a type of occult spinal dysraphism that puts abnormal traction on the spinal cord. This study analyzed neonates and infants who were referred to our pediatric urology practice and had evidence of lumbosacral cutaneous manifestation on physical examination. Methods: We reviewed the presence of lumbosacral cutaneous manifestations in neonates and infants evaluated in our pediatric urology clinic at our Institution over a 6-year period (1 March, 2015–28 February, 2021) with no prior diagnosis of lumbosacral cutaneous manifestation. All patients underwent a spinal ultrasound. Results: The most common lumbosacral cutaneous manifestations were bifurcated/duplicated gluteal folds (33%), gluteal asymmetry (19%), and sacral dimples (14%). A total of 34 (24%) patients had an abnormal spinal ultrasound; 15 (44%) of these infants underwent a lumbar magnetic resonance imaging. A coccygeal pit was statistically marginally higher in abnormal versus normal spinal ultrasound (p = 0.07). Patients with only one lumbosacral cutaneous manifestation (N = 121) were significantly more likely to have a normal spinal ultrasound compared to those with two or more lumbosacral cutaneous manifestation (N = 17) (79% vs 53%, p = 0.03). Conclusion: Due to the varying risk of certain lumbosacral cutaneous manifestations with occult spinal dysraphism, all patients with a lumbosacral cutaneous manifestation should undergo spinal ultrasound. This study also highlights the importance of urodynamic studies when there are abnormal cutaneous findings. Routine physical examinations of the lumbar region for cutaneous manifestations of occult spinal dysraphism are vital to ensure prompt management of tethered cord syndrome and avoid potentially devastating consequences.

Cross-validation of ultrasound imaging in adolescent idiopathic scoliosis

Purpose Adolescent idiopathic scoliosis (AIS) patients are exposed to 9–10 times more radiation and a fivefold increased lifetime cancer risk. Radiation-free imaging alternatives are needed. Ultrasound imaging of spinal curvature was shown to be accurate, however, systematically underestimating the Cobb angle. The purpose of this study is to create and cross-validate an equation that calculates the expected Cobb angle using ultrasound spinal measurements of AIS patients. Methods Seventy AIS patients with upright radiography and spinal ultrasound were split randomly in a 4:1 ratio to the equation creation (n = 54) or validation (n = 16) group. Ultrasound angles based on the spinous processes shadows were measured automatically by the ultrasound system (Scolioscan, Telefield, Hong Kong). For thoracic and lumbar curves separately, the equation: expected Cobb angle = regression coefficient × ultrasound angle, was created and subsequently cross-validated in the validation group. Results Linear regression analysis between ultrasound angles and radiographic Cobb angles (thoracic: R2 = 0.968, lumbar: R2 = 0.923, p < 0.001) in the creation group resulted in the equations: thoracic Cobb angle = 1.43 × ultrasound angle and lumbar Cobb angle = 1.23 × ultrasound angle. With these equations, expected Cobb angles in the validation group were calculated and showed an excellent correlation with the radiographic Cobb angles (thoracic: R2 = 0.959, lumbar: R2 = 0.936, p < 0.001). The mean absolute differences were 6.5°–7.3°. Bland–Altman plots showed good accuracy and no proportional bias. Conclusion The equations from ultrasound measurements to Cobb angles were valid and accurate. This supports the implementation of ultrasound imaging, possibly leading to less frequent radiography and reducing ionizing radiation in AIS patients.

Ultrasound in obstetric practice

The use of ultrasound to aid location of the spinal and epidural space is not a new concept but has gained increasing popularity, particularly in woman who are obese, have abnormal spinal anatomy, or where regional placement has or is proving difficult. The benefits and challenges of spinal ultrasound imaging are discussed, with the methods to scan and obtain the right views or planes with the supporting images for spinal and epidural techniques. The use of ultrasound to perform a transversus abdominis plane (TAP) block is also illustrated. The chapter concludes with a section on the additional applications of ultrasound for vascular access and gastric volume estimation.