Enhancing acetabular reaming accuracy: optimal techniques and a novel reamer design.

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering
• Materials Science

Background:

• Accurate bone reaming is essential for successful press-fit implantation, directly impacting implant stability and longevity.
• Inaccurate reaming can lead to critical complications such as bone fracture, implant deformation, micromotion, and loosening.
• Factors influencing reaming accuracy include reamer design, surgical technique, and bone quality.

Purpose of the Study:

• To evaluate the accuracy of different bone reaming techniques.
• To assess the precision of a novel, additively manufactured reamer design.
• To compare the performance of the novel reamer against conventional designs.

Main Methods:

• Eighty composite bone models (half high-density, half low-density) were used.
• Reaming was performed using either a conventional or a novel reamer design.
• Two techniques were tested: 'straight' and 'whirlwind'; achieved cavity diameters were measured via 3D laser scanning.

Main Results:

• The novel reamer design demonstrated superior accuracy compared to the conventional reamer across both techniques (p < 0.001 for whirlwind, p = 0.001 for straight).
• The 'whirlwind' technique significantly improved accuracy over the 'straight' technique for both reamer types (p < 0.0001 for conventional, p = 0.007 for novel).
• Reaming errors were notably higher in low-density bone models compared to high-density models (p = 0.005).

Conclusions:

• The novel reamer design offers enhanced accuracy in achieving target reaming diameters.
• The 'whirlwind' reaming technique improves accuracy with both novel and conventional reamers.
• Recommendations include using the novel reamer with the 'whirlwind' technique, with special consideration for patients with lower bone quality.