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Related Experiment Video

Updated: Jul 2, 2026

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
09:31

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty

Published on: February 27, 2018

Reproducing Valgus Angle in Uncemented Humeral Hemiarthroplasty.

Jefferson Li1, John M Ibrahim1, Sophie S Darwiche2

  • 1Department of Orthopaedic Surgery, University of Pittsburgh, Kaufmann Medical Building, Pittsburgh, PA.

Journal of Hand Surgery Global Online
|July 1, 2026
PubMed
Summary
This summary is machine-generated.

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Bones of the Upper Limb: Humerus01:19

Bones of the Upper Limb: Humerus

The upper limb consists of the arm, forearm, wrist, and hand bones. The humerus is the single bone of the upper arm region. Proximally, it has a large, spherical, smooth head that articulates with the glenoid cavity of the scapula to form the glenohumeral or shoulder joint. The margin of the head is the anatomical neck, a residual epiphyseal plate. Laterally it extends to form bony projections called the greater tubercle and the lesser tubercle. Next to the tubercles is the surgical neck, a...

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This study shows uncemented elbow hemiarthroplasty with intramedullary screws can restore native distal humerus valgus alignment. Radiographic analysis confirms successful reproduction of the flexion-extension axis of rotation.

Area of Science:

  • Orthopedic surgery
  • Biomechanical analysis
  • Radiographic assessment

Background:

  • Successful elbow hemiarthroplasty requires restoring native anatomy.
  • Intramedullary (IM) screw fixation is a method for uncemented hemiarthroplasty.

Purpose of the Study:

  • To determine if uncemented hemiarthroplasty with IM screw fixation can restore distal humerus valgus alignment.
  • To assess the reproduction of the flexion-extension axis of rotation using radiographic parameters.

Main Methods:

  • Six cadaveric elbow specimens were dissected and radiographed to establish native distal humerus anatomy.
  • Hemiarthroplasty components were implanted using IM screw fixation.
  • Post-implantation radiographs were compared to native anatomy to measure angulation.
Keywords:
Distal humerus fractureElbow arthritisElbow hemiarthroplastyIntramedullary screwUncemented hemiarthroplasty

Related Experiment Videos

Last Updated: Jul 2, 2026

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
09:31

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty

Published on: February 27, 2018

Main Results:

  • The mean difference in articular spool valgus was 3.64°.
  • Angulation between the IM canal and the IM screw ranged from 1° to 2.3°.
  • Angulation between the IM canal and the implant body component was less than 3.5°.

Conclusions:

  • Uncemented hemiarthroplasty with IM screw fixation can radiographically recreate distal humerus valgus angulation within 4°.
  • Factors like screw-bone and component-bone angulation contribute to accommodating anatomical variations.