Cross-sectional area of the tendon and the muscle of the biceps brachii in shoulders with rotator cuff tears

Figures & data

Figure 1. Sites of cross-sectional area (CSA) measurement. The CSA of the LHB tendon was measured at 9 different levels. The distal stump of each segment was sectioned into a thin slice and measured using NIH Image. Segment 1:glenoid origin. Segment 4:entrance to the bicipital groove. Segment 9: musculotendinous junction.

CSAs of the LHB tendon

Segment no.	CSA of shoulder (mm^2)		P-values
	normal	cuff tear
1	18 (10)	20 (10)	0.7
2	18 (21)	31 (9.5)	0.3
3	13 (27)	33 (6.5)	0.01
4	11 (15)	26 (3.9)	0.009
5	10 (10)	19 (3.7)	0.04
6	9.9 (4.7)	16 (3.3)	0.04
7	9.9 (3.5)	13 (3.1)	0.08
8	9.7 (2.6)	13 (3.1)	0.1
9	10 (2.7)	13 (3.5)	0.2

Segment no., see Figure 1.

Figure 2. CSA of the LHB tendon (mm²). The CSAs of the LHB tendon near the entrance to the bicipital groove were significantly greater in cuff tear shoulders than in normal shoulders (*p < 0.05).