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The Current Knowledge on Spinopelvic Mobility.

Zachary C Lum1, John G Coury1, Jonathan L Cohen1

  • 1Valley Orthopedic Surgery Residency, Doctors Medical Center, Department of Orthopaedic Surgery, Modesto, CA.

The Journal of Arthroplasty
|September 24, 2017
PubMed
Summary
This summary is machine-generated.

Rethinking total hip arthroplasty dislocation risk factors is crucial. Understanding spinopelvic motion, the interplay of pelvic tilt, lumbar lordosis, and acetabular anteversion, can improve implant positioning and reduce instability.

Keywords:
dislocationhip instabilityspinopelvic alignmentspinopelvic mobilitytotal hip arthroplasty

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Area of Science:

  • Orthopedic surgery
  • Biomechanics
  • Arthroplasty

Background:

  • Conventional understanding of total hip arthroplasty dislocation risk factors may be insufficient.
  • Many hip instability cases occur despite acetabular cups implanted within traditional safe zones.

Purpose of the Study:

  • To investigate the role of spinopelvic motion in total hip arthroplasty instability.
  • To explore how understanding spinopelvic interactions can refine safe zones for acetabular cup implantation.

Main Methods:

  • Analysis of spinopelvic motion, a biomechanical relationship involving acetabular anteversion, pelvic tilt, and lumbar lordosis.
  • Classification of spinopelvic motion into types: normal, hypermobile, stiff, stuck standing, stuck sitting, and fused.

Main Results:

  • Normal spinopelvic motion involves coordinated hip flexion, sacral tilt, and lumbar lordosis changes during transitions like standing to sitting.
  • This motion accommodates femoral flexion, preventing impingement and dislocation.

Conclusions:

  • Acetabular cup implantation should ideally consider individual spinopelvic motion patterns.
  • Adapting implantation based on these biomechanical interactions may reduce impingement and dislocation rates.
  • New insights into spinopelvic interactions enhance understanding of safe anteversion and inclination zones.