PRAXIM SELECT PEER-REVIEWED PUBLICATIONS
visualization tools : Computer Vision and Ultrasound for MIS
P. Kilian, C.
Plaskos, S. Parratte, J.N. Argenson, E. Stindel, J. Tonetti, S.
Int J Med Robot. 2008 Mar;4(1):23-31.
BACKGROUND: A versatile image acquisition method called echo
surgetics has been developed for minimally invasive
computer-assisted orthopaedic procedures. The principle of echo
surgetics is to use freehand three-dimensional (3D) ultrasound to
acquire relevant 3D bone surface and point data transcutaneously,
eliminating access problems associated with conventional
digitizers. The concept has been implemented in three
technologies: Echo Point, Echo Matching and Echo Morphing.
METHODS: Cadaver experiments were carried out to evaluate the
accuracy of (a) Echo Point for digitization of the anterior pelvic
plane (APP) in total hip arthroplasty, and (b) Echo Morphing for
reconstructing the distal femur in minimally invasive knee
surgery. RESULTS AND CONCLUSIONS: Echo Point provided
significantly improved results (p < 0.001) over conventional
digitization where mean tilt errors exceeded 20 degrees. The Echo
Morphing experiments demonstrated that with a reasonable number of
points (ca. 1000) and initial attitude (IA) error (ca. 5-10 mm and
5-10 degrees ) we can obtain an average accuracy of approximately
1 mm that is sufficient for most of clinical applications.
Navigated Universal Knee Instrumentation, a fast and precise method
for making all femoral cut in Total Knee
A.Pearle, T. Sculco, C.Granchi,
Arthroplasty, Proceedings of ISTA 2006
Reliability of navigated knee stability examination: a cadaveric
Pearle AD, Solomon DJ, Wanich
T, Moreau-Gaudry A, Granchi CC, Wickiewicz TL, Warren RF.
Am J Sports Med. 2007 Aug;35(8):1315-20. Epub 2007
BACKGROUND: Clinical examination remains empirical and may be
confusing in the setting of rotatory knee instabilities.
Computerized navigation systems provide the ability to visualize
and quantify coupled knee motions during knee stability
examination. HYPOTHESIS: An image-free navigation system can
reliably register and collect multiplanar knee kinematics during
knee stability examination. STUDY DESIGN: Controlled laboratory
study. METHODS: Coupled knee motions were determined by a
robotic/UFS testing system and by an image-free navigation system
in 6 cadaveric knees that were subjected to (1) isolated varus
stress and (2) combined varus and external rotation force at 0
degrees, 30 degrees, and 60 degrees. This protocol was performed
in intact knees and after complete sectioning of the
posterolateral corner (lateral collateral ligament, popliteus
tendon, and popliteofibular ligament). The correlation between
data from the surgical navigation system and the robotic
positional sensor was assessed using the intraclass correlation
coefficient. The 3-dimensional motion paths of the intact and
sectioned knees were assessed qualitatively using the navigation
display system. RESULTS: Intraclass correlation coefficients
between the robotic sensor and the navigation system for varus and
external rotation at 0 degrees, 30 degrees, and 60 degrees were
all statistically significant at P < .01. The overall intraclass
correlation coefficient for all tests was 0.9976 (P < .0001).
Real-time visualization of the coupled motions was possible with
the navigation system. Post hoc analysis of the knee motion paths
during loading distinguished distinct rotatory patterns.
CONCLUSION: Surgical navigation is a precise intraoperative tool
to quantify knee stability examination and may help delineate
pathologic multiplanar or coupled knee motions, particularly in
the setting of complex rotatory instability patterns.
Repeatability of load application during clinical stability
testing remains problematic. CLINICAL RELEVANCE: Surgical
navigation may refine the diagnostic evaluation of knee
Adjustable Constraints - A Novel
Method for Positioning 8-in-1 Cutting Guides in Computer Assisted
Granchi C, Plaskos C, Lavallée S,
5th Annual Meeting of CAOS International
Proceedings, Helsinki, Finland, June 19-22, 2005
Mini-Screen: an Innovative Device for Computer Assisted Surgery
Mansoux, B., Nigay, L., and
Studies in Health Technology and Informatics, vol
111/2005, pp. 314 - 320, IOS Press, ISBN : 1-58603-498-7
this paper we focus on the design of Computer Assisted Surgery
(CAS) systems and more generally Augmented Reality (AR) systems
that assist a user in performing a task on a physical object.
Digital information or new actions are defined by the AR system to
facilitate or to enrich the natural way the user would interact
with the real environment. We focus on the outputs of such
systems, so that additional digital information is smoothly
integrated with the real environment of the user, by considering
an innovative device for displaying guidance information: the
mini-screen. We first motivate the choice of the mini-screen based
on the ergonomic property of perceptual continuity and then
present a design space useful to create interaction techniques
based on a mini-screen. Two versions of a Computer ASsisted
PERicardial (CASPER) puncture application, as well as a computer
assisted renal puncture application, developed in our teams, are
used to illustrate the discussion.