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

Table 5

Median medial PA values for the superficial, middle, and deep parts of the anterior and posterior regions.

Region of muscle and tear category		PA med. (degree)
		Superficial	Middle	Deep
Anterior
A	4	15.58^a (2.19–29.78)	12.97^b (2.20–45.11)	13.87^b* (2.17–30.51)
B	4	19.22^a (3.88–44.64)	15.95^b (2.02–46.63)	11.52^c (2.34–27.95)
C	4	28.40^a (2.37–89.20)	22.96^b (2.01–85.95)	19.99^c (2.17–89.11)
Posterior
A	4	17.85^a (7.14–34.52)	14.46^b** (4.52–31.42)	16.54^ab** (3.78–32.19)
B	4	14.06^a*** (2.96–34.68)	13.55^ab*** (2.10–23.96)	10.71^b*** (2.20–33.36)
C	2	19.40^† (4.83–33.15)	12.58^† (5.29–23.38)	13.89^† (5.39–26.37)

A: partial thickness tendon tear; B: full-thickness tear with no retraction of tendon; C: full-thickness tendon tear with retraction; PA med.: medial pennation angle; median with ( ) minimum and maximum values. If superscript letters are different, it indicates statistically significant (P < 0.001) difference between the superficial, middle, and deep parts of specimens within the same tear category. ^*P = 0.163 middle and deep; ^**P = 0.026 superficial and deep, P = 0.021 middle and deep; ^***P = 0.047 superficial and middle, P = 0.002 superficial and deep, and P = 0.419 middle and deep; P = 0.208 middle and deep. ^†Statistical analysis was not conducted due to sample size.