Pair-wise vs group-wise registration in statistical shape model construction: representation of physiological and pathological variability of bony surface morphology.

Comput Methods Biomech Biomed Engin 2019 May 1;22(7):772-787. Epub 2019 Apr 1.

b Orthopaedic and Trauma Department , Luigi Sacco Hospital, ASST FBF-Sacco , Milan , Italy.

Statistical shape models (SSM) of bony surfaces have been widely proposed in orthopedics, especially for anatomical bone modeling, joint kinematic analysis, staging of morphological abnormality, and pre- and intra-operative shape reconstruction. In the SSM computation, reference shape selection, shape registration and point correspondence computation are fundamental aspects determining the quality (generality, specificity and compactness) of the SSM. Such procedures can be made critical by the presence of large morphological dissimilarities within the surfaces, not only because of anthropometrical variability but also mainly due to pathological abnormalities. In this work, we proposed a SW pipeline for SSM construction based on pair-wise (PW) shape registration, which requires the a-priori selection of the reference shape, and on a custom iterative point correspondence algorithm. We addressed large morphological deformations in five different bony surface sets, namely proximal femur, distal femur, patella, proximal fibula and proximal tibia, extracted from a retrospective patient dataset. The technique was compared to a method from the literature, based on group-wise (GW) shape registration. As a main finding, the proposed technique provided generalization and specificity median errors, for all the five bony regions, lower than 2 mm. The comparative analysis provided basically similar results. Particularly, for the distal femur that was the shape affected by the largest pathological deformations, the differences in generalization, specificity and compactness were lower than 0.5 mm, 0.5 mm, and 1%, respectively. We can argue the proposed pipeline, along with the robust correspondence algorithm, is able to compute high-quality SSM of bony shapes, even affected by large morphological variability.

Download full-text PDF

Source
http://dx.doi.org/10.1080/10255842.2019.1592378DOI Listing
May 2019
3 Reads

Publication Analysis

Top Keywords

shape registration
12
large morphological
12
shape
9
bony surface
8
ssm bony
8
generalization specificity
8
reference shape
8
correspondence algorithm
8
distal femur
8
point correspondence
8
proposed pipeline
8
statistical shape
8
specificity compactness
8
ssm
5
bony
5
proximal tibia
4
femur distal
4
algorithm addressed
4
tibia extracted
4
patella proximal
4

References

(Supplied by CrossRef)

Similar Publications