Bone bruising severity after anterior cruciate ligament rupture predicts elevation of chemokine MCP-1 associated with osteoarthritis

Journal of Experimental Orthopaedics

Table 1 Prevalence of subarticular bone bruising by sector with intra- and inter-rater agreement

Sector^a	Prevalence of Bone Bruising Among Final Grades	Intra-Rater Agreement^b (Agreement Kappa Interpretation)						Combined Inter-Rater Agreement^b (Kappa Interpretation)
Sector^a	Prevalence of Bone Bruising Among Final Grades	Rater 1			Rater 2			Combined Inter-Rater Agreement^b (Kappa Interpretation)
Lateral Femur Anterior	8%	95%	0.53	moderate	97%	0.00	slight
Lateral Femur Central^a	84%	92%	0.81	near perfect	92%	0.77	substantial	0.52	moderate
Lateral Femur Posterior	0%	98%	0.66	substantial	97%	0.00	slight
Lateral Tibia Anterior	3%	98%	0.49	moderate	92%	0.27	fair
Lateral Tibia Central	0%	97%	0.53	moderate	90%	-0.05	poor
Lateral Tibia Posterior^a	93%	87%	0.59	moderate	88%	0.54	moderate	0.38	fair
Tibial Spines	16%	91%	0.29	fair	90%	0.62	substantial
Medial Femur Anterior	3%	100%	1.00	perfect	99%	0.79	substantial
Medial Femur Central	13%	94%	0.65	substantial	95%	0.66	substantial
Medial Femur Posterior	0%	―	―	N/A	98%	0.00	slight
Medial Tibia Anterior	2%	98%	0.00	fair	100%	1.00	perfect
Medial Tibia Central	0%	97%	0.48	moderate	98%	0.00	slight
Medial Tibia Posterior^a	64%	90%	0.72	substantial	92%	0.72	substantial	0.53	moderate

^aBolding indicates sectors where bruising was present on > 50% of all reads
^bWeighted agreement (i.e., larger discrepancies between grades affect agreement more than smaller discrepancies, interpretations per Landis & Koch (1977)