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Related Experiment Videos

Total shoulder replacement by magnetic arthroplasty

L Doursounian1, J Honiger, E Pujade-Lauraine

  • 1Hotel Dieu University Hospital, Paris, France.

Journal of Shoulder and Elbow Surgery
|April 3, 1998
PubMed
Summary
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Permanent magnets offer a solution for shoulder implant instability. A case study showed a patient experienced pain-free, stable shoulder function for 24 months post-implantation.

Area of Science:

  • Biomaterials Science
  • Orthopedic Surgery
  • Medical Device Engineering

Background:

  • Shoulder implant instability is a challenge, particularly with rotator cuff destruction.
  • Permanent magnets present a novel approach to address this instability.
  • This case study explores their application in a patient with proximal humerus metastasis.

Observation:

  • A 66-year-old patient with proximal humerus metastasis underwent surgery with a novel magnetic shoulder implant.
  • The implant comprised samarium-cobalt magnets in the humeral head and a titanium nitride-coated glenoid component.
  • The system demonstrated a breakaway force of approximately 40 N.

Findings:

  • At 24 months post-surgery, the patient reported a pain-free shoulder with good functional range of motion.

Related Experiment Videos

  • The patient achieved 30 degrees flexion, 45 degrees external rotation, and internal rotation to T8, enabling daily activities.
  • Radiographic evaluation showed no signs of implant loosening or humeral head dislocation.

    • Implications:

    • Permanent magnet shoulder implants show promise for restoring function in patients with severe shoulder instability.
    • This technology could offer a viable solution for patients with bone loss due to cancer metastasis.
    • Long-term follow-up is crucial to assess the durability and potential complications of magnetic shoulder implants.