Scapholunate Kinematics After Combined Palmar and Dorsal Ligament Reconstruction: A Quantitative Evaluation Using Four-Dimensional Computed Tomography.

Purpose: This observational pilot study investigated (1) carpal positioning in the neutral wrist pose, (2) the scapholunate (SL) rotation axis, (3) physiological SL motion, and (4) the SL distance after combined palmar and dorsal SL ligament reconstruction using quantitative four-dimensional computed tomography (4D-CT) imaging.

Methods: Six subjects were included, and 4D-CT images of both wrists were obtained. Kinematic parameters of the treated side were compared to those of the healthy contralateral side, which was used as the normal reference.

Patient-specific scaphoid prosthesis: surgical technique.

The scaphoid bone is essential for wrist stability, force transmission, and movement, being crucial for maintaining carpal kinematics. In cases where the scaphoid is non-reconstructable, a complete replacement can serve as a treatment option to preserve carpal alignment and motion. This approach has evolved since its first descriptions in 1945, benefiting significantly from advancements in patient-specific implant design, additive manufacturing/3D printing, and material use in recent years.

Accuracy of intertrochanteric osteotomy for patients with slipped capital femoral epiphysis operated with 3D printed patient-specific guides.

Background: Slipped Capital Femoral Epiphysis (SCFE), is one of the most common hip disorders in adolescents, and is treated surgically by performing an Imhäuser osteotomy. The use of 3D printed guides has shown promise in improving the accuracy of the osteotomy. However, misplacement of the guide may limit the improvement.

Bilateral symmetry assessment of healthy forearm kinematics using 4D-CT.

Advanced stage distal radio-ulnar joint (DRUJ) injury may warrant radius corrective osteotomy or arthroplasty. These procedures aim to restore geometry, function and kinematics and could benefit from preoperative planning where the contralateral forearm is typically used as reference. Natural variations regarding geometry and function between forearms are known but kinematic differences are not.