Reinforcement of bone cement using metal meshes

Area of Science:

• Biomaterials Engineering
• Orthopaedic Surgery
• Mechanical Engineering

Background:

• Bone cement failure, particularly cement cracking and stem loosening, is a significant issue in hip joint prostheses.
• Previous research has explored methods to enhance the mechanical properties of bone cement.

Purpose of the Study:

• To develop and evaluate a practical system for in situ fibre reinforcement of bone cement in hip joint prostheses.
• To assess the impact of fibre reinforcement on the fatigue life and durability of the prosthesis-cement construct.

Main Methods:

• Development of a system for inserting a fibre preform around the prosthesis stem during surgery.
• Composite formation between the fibre preform and the bone cement.
• Fatigue testing on full-scale hip joint models with reinforced and unreinforced cement.

Main Results:

• In situ fibre reinforcement with a metal fibre preform improved fatigue life by over an order of magnitude.
• Reinforcement significantly delayed the onset of cement cracking and stem loosening in hip joint prosthesis models.
• Preliminary data suggest carbon fibres may offer even greater improvements compared to metal fibres.

Conclusions:

• In situ fibre reinforcement is a promising technique to enhance the longevity of hip joint prostheses.
• Metal fibre reinforcement effectively improves fatigue performance and reduces failure modes associated with bone cement.
• Further clinical evaluation is warranted, with potential for other fibre materials to yield superior results.