Prospective analysis of Sheehan total knee arthroplasty

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering

Background:

• The Sheehan prosthesis, a total knee arthroplasty (TKA) design from 1975, did not include patellar resurfacing.
• Early TKA designs may have limitations with extended follow-up periods.

Purpose of the Study:

• To review the clinical outcomes of Sheehan total knee arthroplasties.
• To assess the long-term efficacy of TKAs without patellar resurfacing.

Main Methods:

• Prospective study of 64 Sheehan TKAs in 52 patients.
• Average follow-up of 5.5 years.
• Analysis of pain relief, need for analgesics, and secondary procedures.

Main Results:

• 74% of patients experienced complete pain relief or mild discomfort.
• Patellar resurfacing in 3 cases increased success to 81%.
• 12% of knees required revision surgery due to infection, component failure, or loosening.

Conclusions:

• While initially successful, the Sheehan TKA's lack of patellar resurfacing impacted long-term results.
• Component failure may be linked to high stress on small surface areas.
• The findings contributed to the development of newer, improved TKA designs.