Evaluation of a Novel Method for Determining Transverse Plane Pelvic Obliquity

Torretti, Joel; Segal, Lee S.; Brenneman, Rodney; Shrader, M. Wade; Chinchilli, Vernon M.; Vanderhave, Kelly L.

doi:10.1016/j.jspd.2013.09.006

Cited by 2 publications

(4 citation statements)

References 15 publications

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“…The height between line B and Where Line A and line C meet each other is PO quantity. Zhou et al [3] revealed a simple method, as well as Torretti et al [4], discuss. Their method describes by two lines which one line linked the top of both iliac crests on AP radiography of pelvis and the second was the lowest part of the fourth lumbar vertebra and PO angel de ned where two lines intersect.…”

Section: Discussionmentioning

confidence: 97%

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Pelvic Obliquity, It Is Not a Neutral Angle in the Normal Population

Moharrami

Tamehri

Ghasemi

et al. 2021

Preprint

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Introduction: The definition of pelvic obliquity angle (PO) still unclear in the normal population. Several factors might cause the obliquity i.e. hip osteoarthritis, developmental dysplasia of hip, trauma, scoliosis and spine related factors. Perhaps, pelvic obliquity is expressed as a deviation of neutral alignment in the normal population. We developed present study to evaluate the distribution of pelvic obliquity angle in normal population.Method: present study retrospectively enrolled on 134 cases (70 female and 64 male) without any problem of spine, pelvic and lower extremity abnormality who referred to our institution from January 2017 to January 2018 for non-orthopedic problems. We retrospectively reviewed radiographs from institutional PACS and measured pelvic obliquity angle using mediCAD Classic software (version 3.50.0.1, Hectec, Landstuhl, Germany). Finally, all data were analyzed with SPSS software (version 24.0, USA).Result: present study show that all data has significant relationship in one sample T test. All PO angles were normally distributed in kurtosis and skewness test. The patients were aged with a mean of 39.6 ±16.8 in current study. The mean of PO angle was 2.18 ±1.6 in all patients and 0.13 standard error of mean. There was no significant differences between male and female genders (2.07 ±1.6 vs 2.27±1.6, P=0.47). This study reveal that age and PO angle had not any correlation (P=0.165).Conclusion: despite this fact, there was an attitude that PO angle normally is in neutral alignment, our result uncover that the normal range of PO angle was not neutral and ranged from 0.58 to 4.4 degrees with one standard deviation from mean in the normal population.

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Section: Discussionmentioning

confidence: 97%

“…At the same way, Torretti et al perform a study and utilize inferior part of the sacroiliac joint and the lateral edge of anterior superior iliac spine. [4] The aim we are looking for in this study is to de ne a normal range of pelvic obliquity angel by measuring in people who do not have any issues that affect the PO.…”

Section: Introductionmentioning

confidence: 99%

Pelvic Obliquity, It Is Not a Neutral Angle in the Normal Population

Moharrami

Tamehri

Ghasemi

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…The height between line B and the point where line A and line C meet is the PO angle. Zhou et al [ 19 ] revealed a simple method, and Torretti et al [ 15 ], discussed it. Two lines described their method: one line linked the top of both iliac crests on AP pelvis radiography, and the second was the lowest part of the fourth lumbar vertebra, and PO angle defined where two lines intersect.…”

Section: Discussionmentioning

confidence: 99%

“…Zhou et al describe a slightly different way of measuring PO by using the iliac crest and fourth lumbar vertebra and classifying them into six groups [ 19 ]. Similarly, Torretti et al utilized the inferior parts of the sacroiliac joint and the anterior superior iliac spines [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Slight pelvic obliquity is normal in a healthy population: a cross‐sectional study

et al. 2023

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Purpose Pelvic obliquity (PO) has not been extensively investigated, and there is no gold standard for measurement. The PO is essential for surgeons in planning hip arthroplasty, which includes the restoration of leg length discrepancy (LLD). We aimed to establish a normative range of PO angles by measuring healthy individuals without musculoskeletal disorders. Methods Our study included 134 consecutive cases (70 females) referred to our institution between April 2020 and September 2021 for non-orthopedic problems. Patients were screened for normal gait and posture using the visual observation method (VOM) and the Modified Gait Abnormality Rating Scale (GARS-M). In standing standard radiographs, the PO angle was measured as the angle between the horizontal plane and the inter-teardrop line. Results Patients' mean age and Body Mass Index (BMI) were 39.7 ± 16.8 and 22.3 ± 3.1, respectively. PO angles did not follow a normal distribution, with a median (IQR) of 2.0° (0.9°—3.1°). According to the Wilcoxon one-sample test, the median PO angle differed significantly from zero (P < 0.001). The PO angle did not differ significantly between males and females (2° vs. 2°, P = 0.46), nor did it correlate significantly with age (P = 0.24). Considering the 95% percentile of PO angles was 5.6°, this range (0°—5.6°) was regarded as a normative value. Conclusion Normative values for PO in the normal healthy population range from 0° to 5.6°, with a median value of 2.0°. The PO angle was independent of age and sex and differed significantly from 0°. Slight pelvic obliquity may be normal, and physicians should not always assume that it is caused by pain, scoliosis, or weakness of the abductors. Level of evidence III.

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Evaluation of a Novel Method for Determining Transverse Plane Pelvic Obliquity

Abstract: The ability to reliably measure and calculate the degree of transverse plane rotation by radiographs in cerebral palsy patients with spino-pelvic deformity by the method described by Lucas et al. is poor, likely because of difficulty in consistently identify pelvic landmarks.

Cited by 2 publications

References 15 publications

Pelvic Obliquity, It Is Not a Neutral Angle in the Normal Population

Pelvic Obliquity, It Is Not a Neutral Angle in the Normal Population

Slight pelvic obliquity is normal in a healthy population: a cross‐sectional study

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