Radiology of total hip replacements

Area of Science:

• Orthopedic Surgery
• Radiology
• Biomaterials Science

Background:

• The Charnley low friction arthroplasty is a significant surgical procedure for hip joint reconstruction.
• Understanding early and late radiographic findings is crucial for assessing implant performance and patient outcomes.

Purpose of the Study:

• To evaluate the radiographic outcomes of the initial 100 Charnley low friction arthroplasties.
• To identify factors influencing the healing of the greater trochanter osteotomy.
• To assess the incidence and impact of radiolucent lines, femoral cortical thickening, loosening, and ectopic ossification.

Main Methods:

• Analysis of early and late roentgenograms (X-rays) from 100 consecutive Charnley low friction arthroplasties.
• Evaluation of bone-cement junctions, osteotomy healing, femoral component stability, and ectopic ossification.
• Utilizing arthrography, including subtraction technique, for complication diagnosis.

Main Results:

• Osteoporosis, wire breakage, and cement coverage issues delayed trochanteric osteotomy healing.
• Radiolucent lines were common at bone-cement junctions (acetabular and femoral).
• Increased femoral cortical thickness, sterile loosening (with varus shift), and ectopic ossification were observed in a subset of patients.

Conclusions:

• Radiopaque cement appears superior to radiolucent cement for arthroplasty.
• Arthrography, especially with subtraction, is valuable for diagnosing complications.
• Early radiographic monitoring is essential for managing potential issues in hip arthroplasty.