Intramedullary plugs in total hip arthroplasty. A comparative study.

Area of Science:

• Orthopedic Surgery
• Biomaterials Engineering
• Radiology

Background:

• Effective cement packing is crucial for the long-term success of total hip arthroplasties.
• Intramedullary plugs are used to control cement migration and ensure adequate pressurization.
• Different plug designs may influence cement distribution and fixation quality.

Purpose of the Study:

• To radiographically compare the cement packing quality achieved with three distinct intramedullary plug types.
• To determine the most effective plug for achieving optimal cement seal within the femoral canal during hip arthroplasty.

Main Methods:

• Radiographic evaluation of cement packing quality in 77 total hip arthroplasties.
• Utilized three types of intramedullary plugs: Thackray polyethylene (disc-shaped), autologous bone, and Richard polyethylene (bullet-shaped).
• Quantified cement distribution and seal effectiveness within the femoral canal.

Main Results:

• The Thackray polyethylene plug (38 mm, disc-shaped) demonstrated significantly better cement packing.
• This plug design effectively sealed the femoral canal compared to other tested plugs.
• Autologous bone and Richard polyethylene plugs showed less optimal cement packing.

Conclusions:

• The disc-shaped Thackray polyethylene intramedullary plug is superior for achieving high-quality cement packing in total hip arthroplasty.
• Plug design, specifically size and shape, significantly impacts cement sealing and packing effectiveness.
• This finding has implications for improving cement fixation and prosthesis longevity.