Change in the Pathologic Supraspinatus: A Three-Dimensional Model of Fiber Bundle Architecture within Anterior and Posterior Regions

Table 2

Median values of architectural parameters for anterior and posterior regions.

Region of muscle and tear category		FBL (cm)	PA lat. (degree)	PA med. (degree)
Anterior
A	4	6.76^a (3.21–10.26)	14.95^a* (2.04–45.24)	13.81^a (2.17–45.11)
B	4	4.97^b (2.59–9.86)	13.91^a* (2.01–46.37)	14.77^b (2.02–46.63)
C	4	2.65^c (0.54–8.98)	23.02^b (2.06–80.38)	24.34^c (2.01–89.20)
Posterior
A	4	5.89^a (2.12–8.52)	24.14^a** (2.04–38.81)	15.94^a (3.78–34.52)
B	4	4.81^b (1.48–8.92)	20.61^b** (4.42–47.55)	11.98^b (2.10–34.68)
C	2	3.02^† (1.59–4.76)	31.95^† (2.42–55.23)	14.29^† (4.83–33.15)

A: partial thickness tendon tear; B: full-thickness tear with no retraction of tendon; C: full-thickness tendon tear with retraction; FBL: fiber bundle length; PA lat.: lateral pennation angle; PA med.: medial pennation angle; ( ) minimum and maximum values. If superscript letters are different, it indicates statistically significant difference of P < 0.001 of parameter between tear categories within the same region. ^*P = 0.100; ^**P = 0.013; ^†statistical analysis was not conducted due to sample size.