Biomechanical Research Of A New Biomaterial Scaphoid Core Prosthesis

Objective: To study the biomechanical properties of the carpal after scaphoid excision and the tendon ball replacement with nano- hydroxyapatite/polyamide(n-HA/PA66) biomaterial scaphoid core prosthesis.Methods: Twelve fresh cadaveric wrists were treated by the proximal of scaphoid excision, the scaphoid excision, the unitary tendon ball replacement of scaphoid and the tendon ball replacement of the scaphoid with n-HA/PA66 biomaterial scaphoid core prosthesis. 50N,100N, 150N,200N,250N loads were applied to the cadaveric wrists. The stress distribution and the contact area of the radialcarpal and unlarcarpal joint were measured.Results: The contact area and the stress distribution of the wrist were singnificantly changed after the proximal of scaphoid excision and the scaphoid excision(p<0.05). After the unitary tendon ball replacement, the contact area of the radialcarpal joint was singnificantly increased, while the stress distribution of the radialcarpal joint was singnificantly decreased(p<0.05). After the the tendon ball replacement with n-HA/PA66 biomaterial scaphoid core prosthesis, the contact area and the stress distribution of the radialcarpal joint didn't changed singnificantly(p>0.05).Conclusion: The contact area and the stress distribution of the wrist changed singnificantly after the proximal of scaphoid excision, the scaphoid excision and the unitary tendon ball replacement. While the contact area and the stress distribution of the wrist did not changed singnificantly after the tendon ball replacement with n-HA/PA66 biomaterial scaphoid core prosthesis.