Research Article

The Subscapularis Muscle: A Proposed Classification System

Table 2

Comparison of morphometric parameters according to subscapularis muscle type.

ParameterMuscle belly type value
IIIIIIIVVVIVIIVIIIIX

Humerus length251.21 (-)255.90 (0.01)250.46 (16.11)254.23 (30.03)259.02 (30.33)271.55 (25.68)275.89 (0.46)265.32 (-)271.16 (0.07)0.4412
Distance between superior and inferior angle162.35 (-)150.85 (0.18)143.00 (12.63)148.48 (22.49)161.13 (20.07)157.73 (9.71)164.88 (0.33)164.23 (-)154.25 (0.35)0.0853
Distance between inferior angle and lesser tubercle195.04 (-)154.17 (0.22)161.76 (13.55)158.86 (12.68)179.47 (21.32)166.43 (18.84)194.90 (0.41)195.78 (-)172.25 (0.10)0.0181
Distance between inferior angle and greater tubercle199.98 (-)176.71 (0.71)176.07 (13.22)176.08 (14.89)179.89 (34.50)190.89 (11.86)204.33 (0.33)201.21 (-)186.66 (0.50)0.0957
Distance between superior angle and lesser tubercle121.34 (-)99.71 (0.71)112.74 (12.90)119.05 (11.50)116.93 (16.63)108.27 (10.06)124.76 (0.17)123.32 (-)119.10 (0.27)0.2606
Distance between superior angle and greater tubercle127.65 (-)120.55 (0.64)121.88 (27.73)132.97 (12.16)126.60 (17.21)122.56 (13.01)140.72 (0.25)128.32 (-)127.68 (0.66)0.3850
Length of the 1st muscle belly116.81 (-)85.58 (0.04)87.19 (12.64)84.04 (14.13)88.77 (11.32)91.18 (10.98)80.87 (0.01)76.21 (-)78.14 (0.04)0.4141
Height of the 1st muscle belly121.69 (-)11.29 (0.02)37.07 (7.35)28.99 (9.59)38.22 (14.21)16.47 (6.71)17.94 (0.10)16.77 (-)17.69 (0.04)0.0000
Height of the 1st muscle belly at 1/2 length71.03 (-)15.97 (0.06)24.65 (6.59)19.49 (7.29)20.00 (4.49)13.53 (8.56)14.97 (0.07)14.33 (-)100.66 (0.01)0.0064
Length of the 2nd muscle belly82.37 (0.06)98.51 (24.34)96.81 (16.07)106.66 (16.11)77.44 (44.46)98.89 (0.02)95.21 (-)12.46 (0.12)0.1333
Height of the 2nd muscle belly28.55 (0.01)38.12 (10.40)29.75 (9.98)26.35 (7.18)22.37 (14.56)20.71 (0.07)19.21 (-)22.19 (0.18)0.0049
Height of the 2nd muscle belly at 1/2 length26.84 (0.52)22.45 (6.02)19.60 (6.90)17.81 (8.32)15.45 (9.77)14.32 (0.01)14.12 (-)9.92 (0.25)0.0526
Length of the 3rd muscle belly104.96 (0.08)122.15 (16.06)110.26 (18.00)121.64 (17.95)113.48 (17.84)103.50 (0.09)100.21 (-)116.78 (0.03)0.1561
Height of the 3rd muscle belly49.88 (0.47)35.55 (7.72)29.11 (8.67)37.22 (24.99)21.80 (16.15)19.13 (0.11)18.21 (-)23.19 (0.34)0.0403
Height of the 3rd muscle belly at 1/2 length23.46 (0.35)24.96 (5.02)17.73 (5.62)15.45 (4.88)13.78 (7.83)12.94 (0.09)12.11 (-)8.20 (0.01)0.0001
Length of the 4th muscle belly109.18 (0.06)120.92 (16.06)126.04 (15.18)117.63 (8.76)113.34 (0.13)112.32 (-)115.73 (0.84)0.5402
Height of the 4th muscle belly26.79 (0.03)30.85 (4.84)25.42 (7.86)17.89 (11.79)15.27 (0.08)14.56 (-)15.74 (0.43)0.0108
Height of the 4th muscle belly in 1/2 length21.84 (0.08)22.35 (6.00)19.36 (4.83)11.24 (6.23)11.89 (0.18)11.21 (-)8.58 (0.05)0.0052
Length of the 5th muscle belly123.96 (8.85)114.25 (5.27)120.31 (0.17)113.21 (-)115.55 (0.08)0.1084
Length of the 5th muscle attached to belly42.21 (-)43.41 (1.76)0.8942
Height of the 5th muscle belly23.36 (3.82)15.76 (7.40)19.11 (0.01)18.87 (-)14.44 (0.18)0.0605
Height of the 5th muscle belly at 1/2 length26.24 (5.68)14.29 (6.26)12.83 (0.08)12.21 (-)9.90 (0.12)0.0275
Length of the 6th muscle belly119.03 (0.25)121.88 (0.18)119.23 (-)123.00 (0.04)0.1283
Height of the 6th muscle belly23.54 (0.15)11.91 (0.05)11.22 (-)12.13 (0.02)0.1283
Length of the 7th muscle belly20.42 (0.30)8.88 0.01 (-)87.21 (-)10.57 (0.04)0.1283
Height of the 7th muscle belly118.05 (0.11)17.87 (-)114.35 (0.52)0.1653
Height of the 7th muscle belly at 1/2 length10.32 (0.01)14.92 (-)15.33 (0.01)0.1653
Length of the 8th muscle belly6.16 (0.02)98.87 (-)6.68 (0.35)0.1653
Height of the 8th muscle belly20.66 (-)86.60 (0.53)0.0010
Height of the 8th muscle belly at 1/2 length14.33 (-)17.25 (0.08)0.6254
Length of the 9th muscle belly15.46 (0.35)—
Mean cross-sectional area8758.66 (-)6181.43 (1.52)7621.12 (1190.27)9307.43 (5682.75)8326.01 (1854.78)9686.83 (818.91)8898.31 (19.36)9300.11 (-)9463.04 (3.79)0.0223