Table 3.

Agreement between the surgeon, therapist, and cell phone app and surgeon for extension and flexion using ICC, with 95% confidence intervals.

ROM	Comparison	ICC	95% CI lower	95% CI upper
Extension	Surgeon vs therapist	0.66	0.57	0.75
Extension	Surgeon vs app	0.64	0.53	0.72
Extension	Therapist vs app	0.58	0.46	0.67
Flexion	Surgeon vs therapist	0.72	0.64	0.79
Flexion	Surgeon vs app	0.82	0.77	0.87
Flexion	Therapist vs app	0.78	0.71	0.84

[3] ICC values <0.50, 0.50-0.75, 0.75-0.90, and >0.90 indicate poor, moderate, good, and excellent correlation, respectively. The correlation between the different methods is moderate overall for extension, and good for flexion.