Hip arthroplasty with a Moore prosthesis with porous coating. A five-year study

Area of Science:

• Orthopedic Surgery
• Biomaterials Science
• Radiology

Background:

• Cemented hip prostheses have limitations, particularly in high-risk patient groups.
• Porous-coated implants offer potential for improved biological fixation.
• Moore hip prostheses are a common design for hip arthroplasty.

Purpose of the Study:

• To evaluate the five-year clinical outcomes of Moore hip prostheses with porous coatings.
• To compare the performance of porous-coated prostheses with cemented prostheses in a high-risk cohort.
• To assess the radiographic evidence of implant fixation and bone response.

Main Methods:

• Prospective clinical study of 26 patients undergoing hip arthroplasty with porous-coated Moore prostheses.
• Follow-up included clinical assessments (Harris hip rating) and radiographic examinations at two, three, and four years.
• Comparison with a simultaneous cohort using cemented prostheses.

Main Results:

• Mean Harris hip ratings improved over time, indicating enhanced patient function.
• Radiographic analysis showed evidence of fibrous and bony tissue ingrowth, suggesting stable fixation.
• Micromotion was observed in one-third of patients at two years, but subsequent radiographs indicated uniform stress transfer and healthy bone modeling.
• No signs of femoral stress shielding were evident after four years.

Conclusions:

• Porous-coated Moore hip prostheses demonstrate encouraging five-year clinical results, comparable to cemented implants.
• Tissue ingrowth provides effective implant fixation, leading to improved function and positive bone remodeling in high-risk patients.
• These implants appear to mitigate stress shielding issues commonly associated with smooth-stem designs.