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Related Experiment Videos

Quantitative bone scanning after asymptomatic Charnley arthroplasty

A B Mullaji1, R C Todd, S Robinson

  • 1University Department of Orthopedic and Accident Surgery, Royal Liverpool University Hospital, UK.

Acta Orthopaedica Scandinavica
|June 1, 1994
PubMed
Summary
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This study tracked 99mtechnetium methylene diphosphonate uptake after hip replacement surgery. Tracer levels in bone around the implant decrease over time, but acetabular uptake remains elevated.

Area of Science:

  • Orthopedic Surgery
  • Nuclear Medicine
  • Radiology

Background:

  • Assessing normal tracer uptake patterns post-hip replacement is crucial for interpreting scans.
  • Complications can alter bone scan findings, necessitating a baseline understanding in uncomplicated cases.

Purpose of the Study:

  • To define the typical pattern of 99mtechnetium methylene diphosphonate (99mTc-MDP) uptake in the early to mid-term postoperative period following primary hip arthroplasty.
  • To establish a reference range for tracer uptake in various peri-prosthetic regions.

Main Methods:

  • 73 patients underwent 99mTc-MDP scans at 6-24 months after primary Charnley hip replacement for arthrosis.
  • Patients were grouped by scan timing (6-24 months post-op).
  • Uptake ratios in 10 peri-prosthetic zones compared to normal bone were calculated using high-resolution gamma camera imaging.

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Main Results:

  • Femoral 99mTc-MDP uptake decreased linearly from 6 to 12 months post-surgery.
  • Post-12 months, femoral uptake stabilized at approximately twice normal in the greater trochanter and 1.5 times normal in the lesser trochanter.
  • Uptake in other femoral zones returned to near-normal levels, while acetabular uptake remained consistently elevated.

Conclusions:

  • A predictable pattern of decreasing femoral and persistently elevated acetabular 99mTc-MDP uptake exists after uncomplicated hip replacement.
  • These findings provide a normative dataset for interpreting bone scans in patients with hip arthroplasty.
  • Understanding this normal uptake variation is essential for accurate diagnosis and management of potential complications.