Table 5.

Interobserver reliability analysis of patellar tendon stiffness in twenty-eight healthy athletes (n = 56 tendons)

	Examiner 1 (SB)	Examiner 2 (AV)	Interobserver reliability
Location	Stiffness (kPa)	Stiffness (kPa)	CV (%)a	CR (kPa)b	ICC (95%CI)c
All ROIs	35.7 [29.2–43.6]	30.4 [24.8–38.9]	21.0 (17.5–24.0)	18.0 [6.2–23.6]	0.79 (0.65–0.88)
ROI 1	31.4 [26.5–41.2]	28.3 [23.1–39.4]	30.2 (23.8–35.4)	19.9 [9.6–29.3]	0.64 (0.39–0.79)
ROI 2	36.2 [27.6–47.2]	49.4 [24.7–38.4]	29.7 (23.9–34.6)	14.3 [9.9–35.3]	0.74 (0.56–0.85)
ROI 3	35.3 [29.8–49.1]	31.1 [23.9–39.9]	33.4 (26.8–38.8)	14.9 [7.7–23.7]	0.66 (0.42–0.80)
ROI 4	37.1 [29.6–45.7]	30.9 [22.3–40.6]	41.8 (35.1–47.6)	16.2 [7.8–25.2]	0.51 (0.15–0.72)

Patellar tendon stiffness was assessed using shear-wave elastography (SWE), expressed as median (interquartile range) in kPa

^aCV: coefficient-of-variation (%), 95% confidence interval

^bCR: coefficient-of-repeatability (kPa), also referred to as the smallest real difference (SRD)

^cICC: intraclass correlation coefficient (ICC), 95% confidence interval