Video-based computer navigation in knee arthroscopy for patient-specific ACL reconstruction.

Area of Science:

• Orthopedic surgery
• Medical imaging
• Computer-assisted surgery

Background:

• Anterior cruciate ligament (ACL) tears are common, requiring surgical reconstruction.
• Accurate bone tunnel drilling is critical for knee stability during ACL reconstruction.
• Current methods for tunnel drilling present technical challenges.

Purpose of the Study:

• To present the first intra-operative video-based guidance system for drilling bone tunnels in arthroscopic ACL reconstruction.
• To improve the accuracy and safety of the tunnel drilling procedure.

Main Methods:

• Utilizes visual markers on bone and tools for pose estimation.
• Employs a registration algorithm to align pre-operative images with intra-operative bone contours.
• Reconstructs bone contours using an instrumented tool.

Main Results:

• Accurate registration of pre-operative models with bone achieved.
• Guided drilling resulted in low errors: 2.5 mm in footprint and [Formula: see text] in orientation.
• Experimental validation with ex-vivo data confirmed method's efficacy.

Conclusions:

• The video-based system offers high accuracy and minimal time overhead.
• No additional incisions or capital equipment are required.
• Presents an appealing, computer-aided alternative for arthroscopic surgery.