Geert J. Streekstra PhD, Presenter: Nothing to Disclose

Remmet Jonges, Abstract Co-Author: Nothing to Disclose

Bart Carelsen, Abstract Co-Author: Employee, Koninklijke Philips Electronics NV

Simon D. Strackee, Abstract Co-Author: Nothing to Disclose

To understand the functioning of the wrist joint, the availability of dynamic 3D motion patterns (i.e. 4D-Imaging) of the carpal bones is essential. Current methods are capable of imaging 3D motion patterns of carpal bones by forced motion of the hand. A drawback of these methods is that a forced motion limits the freedom in choosing diagnostic motion protocols. Therefore we propose imaging of 3D dynamic motion patterns of carpal bones during voluntary motion of the hand based on bi-plane video fluoroscopy images.

For acquisition of bi-plane video fluoroscopy images we used the Alura FD20/10 of Philips. During voluntary motion of the hand, video fluoroscopy time series of two flat panel detectors are simultaneously acquired. Additionally, a CT scan of the wrist is acquired from which radius, ulna and the carpal bones are segmented. By combination of the segmented CT scan and the bi-plane video fluoroscopy series, the three translation and three rotation parameters of each of the 15 bones are obtained. The feasibility of the method in vivo was evaluated by measuring joint space as a function of the pose of the hand during voluntary motion of the hand in healthy subjects and in a patient with SL dissociation.

Experiments on a cadaver specimen reveal that the precision is 0.05 mm for translations and 0.42 degrees for rotations. The in vivo experiments reveal that the 3D motion patterns differ substantially between healthy subjects and the SL-patient. Moreover, in healthy subjects the minimal joint space is virtually independent of the hand pose (1 mm) whereas the joint space varies substantially with the hand pose for the SL-patient (1-3 mm).

Precise estimation of translations and rotation parameters of carpal bones as well as time dependent measurement of joint space can be achieved using dynamic bi-plane video fluoroscopy time series.

Estimation of 3D motion patterns of carpal bones and dynamic joint space measurement during voluntary motion is feasible and potentially useful for patients with dynamic joint problems.

Streekstra, G, Jonges, R, Carelsen, B, Strackee, S, 4D-Imaging of Voluntary Joint Motion from Biplane Fluoroscopy Images.  Radiological Society of North America 2010 Scientific Assembly and Annual Meeting, November 28 - December 3, 2010 ,Chicago IL. http://archive.rsna.org/2010/9006727.html