Sillon intertuberculaire de l'humérus: biométrie et morphologie de 100 os secs

Abstract

The dimensions and morphology of a critical zone of the intertubercular sulcus (ITS) of the humerus were specified for 100 dry bones. The upper part of the ITS was narrow and at an angle with the lower part. The tendon of the long head of the biceps brachii muscle (TLBB) was particularly worn down during its course through this critical zone. The critical zone extended from the first perceptible proximal depression to the distal extremity of the lesser tubercle. It showed a proximal part of 12.4 mm (standard deviation = 2.23) and a distal part of 15.1 mm (s.d. = 3.37). The two parts made an angle of 142 degrees (s.d. = 7.87). Its total length was 28.5 mm (s.d. = 4.74), depth 2.44 mm (s.d. = 0.49), width 6.33 mm (s.d. = 0.84). The supratubercular ridge was the only bony variation, found in 45% of the bones of this series. Bony abnormalities were of three types: (1) calcifications in 39% of the bones, (2) lateral spurs in 32% and medial spurs in 23%, (3) degenerative changes in 9% of the bones. Biometric considerations showed that the TLBB inside the ITS was unstable. The supratubercular ridge could increase this instability and thus favor disease of the tendon. Bony abnormalities which may be associated with TLBB lesions, can be seen in radiographs.

3D Bicipital Groove Shape Analysis and Relationship to Tendopathy

“…3,4,6 Previous studies typically take a single set of 2D measurements of width, depth, and medial wall angle for each BG, either from a dry bone or a radiograph. Additionally, previous researchers note the presence/absence of the supratubercular ridge of Meyer (henceforth referred to as Bthe ridge^) on each BG, which is a ridge of bone projecting immediately proximal to the medial wall of the bicipital groove and continuous with it, 2 and is considered to have an impact on the tendency for dislocation of the LBT.…”

“…Angles of these line segments with respect to the segment PQ are recorded for S. So, for each BG, we have a set of depth and width values and a set of medial wall angles. Since measurements taken in previous work are of a single slice, and previous authors are not specific in describing how the slice is chosen, 3,4,6 we aggregate all of our measurements by taking the mean for a single data set to yield a single depth, width, and medial wall angle for each data set. The choice of how to aggregate the data to best reflect the choices depicting the stages of the dynamic programming process used to find the optimal path through the BG that maximizes criteria of depth and smoothness.…”

“…Three previous studies have performed measurements of depth, width, and medial wall angle on dry bones and radiographs. 3,4,6 Counting all of these studies, each measurement was taken on 130 bones. The results are as follows.…”

“…Because of large slice thickness, the proximal end of the BG is not reliably determined, and a method for reliably determining the distal end is debated. 4 Our approach avoids having to define the beginning and the end of the BG: since the BG is formed by parts of the humerus (tuberosities), we align the humeri, carrying alignment of the BGs along consequently. Our shape descriptor is invariant to rigid transformations except translation along the axial dimension (recall that all BG surfaces are rotated so that the humerus is axially aligned), and it is not invariant to changes in scale.…”

“…9,10 We validate the discriminatory power of our shape descriptor by testing the performance of different classifiers attempting to classify normal versus pathological BG shapes (defined according to established 2D measurements taken in previous literature). 3,4,6,11 The other main contribution of this paper is a study of 32 images of patients presenting with various diagnoses of LBT pathology. In this study, we group the data sets according to expert diagnosis of LBT condition for each data set, and use the 3D shape of their BGs to determine shape differences between the groups.…”