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International Orthopaedics

, Volume 39, Issue 3, pp 383–388 | Cite as

The kinematic relationship between sitting and standing posture and pelvic inclination and its significance to cup positioning in total hip arthroplasty

  • Andrew Stephens
  • Selin Munir
  • Siddarth Shah
  • William Lindsay Walter
Original Paper

Abstract

Purpose

The aim of this study is to describe the influence of sitting and standing posture on sagittal pelvic inclination in total hip replacement patients to assist with correct acetabular component positioning.

Methods

Lateral radiographs of the pelvis and lumbar spine in sitting and standing positions were extracted. Pelvic tilt was measured using the vertical inclination of a line from the anterior superior iliac spine (ASIS) to pubic tubercle. Sacral inclination, Cobb angle of the lumbar spine and hip flexion were recorded.

Results

Sixty patients were identified with a mean age of 63. Men were more likely to flex the lumbar spine in sitting (p = 0.004); 80° of hip flexion is required for seated posture. Stiff hips required compensatory pelvic flexion and lumbar flexion in sitting. There is a linear relationship between hip flexion and pelvic tilt, hip flexion and lumbar lordosis.

Conclusions

Pelvic orientation is determined by lumbar and hip stiffness. This impacts on acetabular version.

Keywords

Pelvic tilt Acetabular anteversion Hip flexion Lumbar flexion 

Notes

Acknowledgments

This study did not require industry or hospital funding. Support was provided by the Specialist Orthopaedic Group practice in terms of electronic hardware and software.

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© SICOT aisbl 2014

Authors and Affiliations

  • Andrew Stephens
    • 1
  • Selin Munir
    • 1
  • Siddarth Shah
    • 1
  • William Lindsay Walter
    • 1
  1. 1.Specialist Orthopaedic GroupWollstonecraftAustralia

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