The medial-lateral force distribution in the ovine stifle joint during walking.

Knowledge of the load distribution in the knee is essential for understanding the interaction between mechanics and biology in both the healthy and diseased joint. While the sheep stifle joint is a predominant model for better understanding regeneration after injury, little is known about the compartmental force distribution between the medial and lateral condyles. By including sheep specific anatomy and gait analyses, we used computational musculoskeletal analyses to estimate the medial-lateral joint contact force distribution in ovine stifle joints during walking by simplifying the system of equations into a 2D problem that was solved directly.

Ultrasound-based navigation and 3D CT compared in acetabular cup position.

Intraoperative landmarks are used in image-free navigation systems. The ultrasound-based navigation systems try to overcome the problems of positional deviation associated with soft tissue. Our study analyzed the accuracy of ultrasound-based navigation of cup positioning compared with postoperative 3-dimensional (3D) computed tomography scans of cup positioning.