als PDF - AGA

Research Day
AGA2012-32
Validierung eines Robotersystems zur Erforschung passiver gleno-humeraler Kinematik
Evaluation of a Robotic Apparatus for the Analysis of Passive Glenohumeral Joint Kinematics
Authors
* Claudio Rosso Universitätsspital Basel Universität Basel Orthopädische Klinik, Basel, Switzerland
Andreas Marc Müller Universitätsspital Basel Universität Basel Orthopädische Klinik, Basel, Switzerland
Victor Valderrabano Universitätsspital Basel Universität Basel Orthopädische Klinik, Basel, Switzerland
Andrea Cereatti Department of Biomedical Sciences University of Sassari Medical School, Sassari, Italy
Joseph P. DeAngelis Beth Israel Deaconess Medical Center Harvard Medical School Department of
Orthopaedic Surgery, Boston, United States
Arun J. Ramappa Beth Israel Deaconess Medical Center Harvard Medical School Department of
Orthopaedic Surgery, Boston, United States
Ara Nazarian Beth Israel Deaconess Medical Center Harvard Medical School Center for Advanced
Orthopaedic Studies, Boston, United States
Ugo Della Croce Department of Biomedical Sciences University of Sassari Medical School, Sassari, Italy
Abstract
Fragstellung: The glenohumeral (GH) joint has the greatest range of motion in the human body but little intrinsic
stability, thereby increasing its susceptibility to excessive translations and injury. Current models used to study
shoulder kinematics are limited because they isolate the GH joint, implement dynamic motion patterns with low
reproducibility, and track motions discontinuously or with limited accuracy. To overcome these limitations, we
have designed a novel system in which the entire shoulder girdle is studied using highly reproducible trajectories
created by a robotic actuator to control a full cadaveric torso.
Methodik: High-speed cameras track bone markers and calibrated anatomical scapular landmarks for
continuous registration of the center of the GH joint. In this study, we evaluated the system`s capacity to capture
reproducibly GH translations in intact and pathologic shoulder conditions. We subjected a left and a right shoulder
of two anthropometrically different cadaveric torsos to three sequential trials of humeral elevation prior to and after
the implementation and restoration of scapular winging as well as a full thickness supraspinatus tear.
Ergebnis: The system was consistently capable of detecting differences in GH translations as small as 0.5mm
between the intact, altered, and restored shoulder presentations. For each condition, three trials were performed.
The registration of GH translations was highly reproducible with intraclass correlation coefficients (ICC) of 0.77 to
0.99 (P