Plug migration and cement mantle assessment in total hip replacement

Area of Science:

• Orthopedic Surgery
• Biomaterials Science

Background:

• Total hip replacement (THR) is a common orthopedic procedure.
• Femoral component fixation using cement is a critical factor for long-term success.
• Medullary plugs are used to manage cement pressurization and prevent distal migration.

Purpose of the Study:

• To compare the effectiveness of polyethylene versus bioabsorbable gelatin medullary plugs in total hip replacements.
• To evaluate the impact of different medullary plugs on cement mantle quality and plug migration.

Main Methods:

• Review of consecutive total hip replacements utilizing modern cementing techniques.
• Comparison of two medullary plug types: polyethylene and bioabsorbable gelatin.
• Assessment of cement mantle quality and plug migration by three independent observers.

Main Results:

• Observer agreement was limited, particularly in assessing cement mantle quality.
• Polyethylene plugs demonstrated a trend towards better cement mantle grading.
• Less distal migration of the femoral component was observed with polyethylene plugs.
• No statistically significant difference was found between the two plug types for the primary outcomes.

Conclusions:

• While polyethylene plugs may offer some advantages in cement mantle formation and migration control, the observed differences were not statistically significant.
• Further research with larger sample sizes may be needed to confirm potential benefits of polyethylene plugs in cemented total hip arthroplasty.