Effect of Changes in Pelvic Tilt on Range of Motion to Impingement and Radiographic Parameters of Acetabular Morphologic Characteristics

Abstract The aim of this study was to determine (i) the reliability of hip range of motion measurement among experienced arthroscopic hip preservation surgeons and (ii) the magnitude of hip flexion change with posterior pelvic tilt. Five experienced arthroscopic hip preservation surgeons (5–18 years of hip surgery experience) performed passive hip range of motion (internal and external rotation), flexion (contralateral hip extended) and flexion with posterior pelvic tilt (contralateral hip maximally flexed) on five young healthy asymptomatic volunteers (three males, two females; 34.4 ± 10.7 years of age). Motion was measured via digital photography and goniometry. Inter-observer reliability was calculated via two-way mixed, single measures, intra-class correlation coefficient. Paired t-test was utilized to compare hip flexion (with contralateral hip extended) to hip flexion with posterior pelvic tilt (with contralateral hip in forced flexion). The reliabilities of measurements of hip flexion with posterior pelvic tilt and external rotation were excellent, that of hip flexion was fair, and that of hip internal rotation was poor. The magnitude of hip flexion increase with posterior pelvic tilt was 17.0° ± 3.0° (P < 0.001). The reliability of hip range of motion measurement by five experienced arthroscopic hip preservation surgeons was excellent for measures of hip flexion with posterior pelvic tilt and external rotation. Contralateral maximal hip flexion significantly increased ipsilateral hip flexion (approximately 17°). Level of Evidence: Diagnostic, level III (without consistently applied reference standard)

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Correlation Between Pelvic Tilt Angle, Hip Range Of Motion And Hip Muscles Torque Ratios

Medicine & Science in Sports & Exercise ◽

10.1249/01.mss.0000685864.60270.2f ◽

2020 ◽

Vol 52 (7S) ◽

pp. 948-948

Author(s):

Maria C. Herrera ◽

Tal Amasay ◽

Claire Egret ◽

Kathryn Ludwig

Keyword(s):

Range Of Motion ◽

Tilt Angle ◽

Pelvic Tilt ◽

Hip Range Of Motion ◽

Hip Muscles

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The Effect of Pelvic Tilt and Femoral Head Size on Hip Range-of-Motion to Impingement

The Journal of Arthroplasty ◽

10.1016/j.arth.2017.06.016 ◽

2017 ◽

Vol 32 (11) ◽

pp. 3544-3549 ◽

Cited By ~ 12

Author(s):

Thomas F. McCarthy ◽

Jim Nevelos ◽

Randa K. Elmallah ◽

Morad Chughtai ◽

Anton Khlopas ◽

...

Keyword(s):

Femoral Head ◽

Range Of Motion ◽

Pelvic Tilt ◽

Head Size ◽

Femoral Head Size ◽

Hip Range Of Motion

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The effect of direct vertebral rotation on the spine parameters (coronal and sagittal) in adolescent idiopathic scoliosis

Journal of Back and Musculoskeletal Rehabilitation ◽

10.3233/bmr-200320 ◽

2021 ◽

pp. 1-8

Author(s):

Carlos Eduardo Gonçales Barsotti ◽

Carlos Augusto Belchior B. Junior ◽

Rodrigo Mantelatto Andrade ◽

Alexandre Penna Torini ◽

Ana Paula Ribeiro

Keyword(s):

Idiopathic Scoliosis ◽

Cobb Angle ◽

Lumbar Lordosis ◽

Thoracic Kyphosis ◽

Pelvic Tilt ◽

Pelvic Incidence ◽

Vertebral Rotation ◽

Sacral Slope ◽

Post Surgery ◽

Radiographic Parameters

BACKGROUND: Idiopathic scoliosis is accompanied by postural alterations, instability of gait, and functional disabilities. The objective was to verify radiographic parameters (coronal and sagittal) of adolescents with idiopathic scoliosis (AIS) pre- and post-surgery with direct vertebral rotation (DVR), associated with type 1 osteotomies in all segments (except the most proximal) and type 2 in the periapical vertebrae of the curves. METHODS: A prospective study design was employed in which 41 AIS were evaluated and compared pre- and post-surgery. Scoliosis was confirmed by a spine X-ray exam (Cobb angle). Eight radiographic parameters were measured: Cobb angles (thoracic proximal and distal), segmental kyphosis, total kyphosis, lumbar lordosis, pelvic incidence, sacral slope, and pelvic tilt. RESULTS: The Cobb angle averaged 51.3∘± 14.9∘. Post-surgery, there were significant reductions for the following spine measurement parameters: Cobb angle thoracic proximal (p= 0.003); Cobb angle thoracic distal (p= 0.001); Cobb angle lumbar (p= 0.001); kyphosis (T5-T12, p= 0.012); and kyphosis (T1-T12, p= 0.002). These reductions showed the effectiveness of surgical correction to reduce Cobb angles and improve thoracic kyphosis. The values obtained for lumbar lordosis, pelvic incidence, sacral slope, and pelvic tilt were not significantly different pre- and post-surgery. CONCLUSION: The surgical technique of DVR in AIS proved to be effective in the coronal and sagittal parameters directed at Cobb angles and thoracic kyphosis in order to favor the rehabilitation process.

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Femoral stem neck geometry determines hip range of motion shape

Bone and Joint Research ◽

10.1302/2046-3758.1012.bjr-2021-0273.r1 ◽

2021 ◽

Vol 10 (12) ◽

pp. 780-789

Author(s):

Aidin Eslam Pour ◽

Jean Yves Lazennec ◽

Kunj P. Patel ◽

Manan P. Anjaria ◽

Paul Edgar Beaulé ◽

...

Keyword(s):

Range Of Motion ◽

Pelvic Tilt ◽

External Rotation ◽

Femoral Stem ◽

Implant Design ◽

Secondary Outcome ◽

Hip Range Of Motion ◽

The Mean ◽

The Difference ◽

Prosthetic Impingement

Aims In computer simulations, the shape of the range of motion (ROM) of a stem with a cylindrical neck design will be a perfect cone. However, many modern stems have rectangular/oval-shaped necks. We hypothesized that the rectangular/oval stem neck will affect the shape of the ROM and the prosthetic impingement. Methods Total hip arthroplasty (THA) motion while standing and sitting was simulated using a MATLAB model (one stem with a cylindrical neck and one stem with a rectangular neck). The primary predictor was the geometry of the neck (cylindrical vs rectangular) and the main outcome was the shape of ROM based on the prosthetic impingement between the neck and the liner. The secondary outcome was the difference in the ROM provided by each neck geometry and the effect of the pelvic tilt on this ROM. Multiple regression was used to analyze the data. Results The stem with a rectangular neck has increased internal and external rotation with a quatrefoil cross-section compared to a cone in a cylindrical neck. Modification of the cup orientation and pelvic tilt affected the direction of projection of the cone or quatrefoil shape. The mean increase in internal rotation with a rectangular neck was 3.4° (0° to 7.9°; p < 0.001); for external rotation, it was 2.8° (0.5° to 7.8°; p < 0.001). Conclusion Our study shows the importance of attention to femoral implant design for the assessment of prosthetic impingement. Any universal mathematical model or computer simulation that ignores each stem’s unique neck geometry will provide inaccurate predictions of prosthetic impingement. Cite this article: Bone Joint Res 2021;10(12):780–789.

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