Measurement Reliability

Inter-rater reliability for tibial rotation measurements was higher than for femoral measurements. The overall NP-SES-C showed excellent internal consistency. The total scale Cronbach's alpha was 0.972. The overall Spearman-Brown split-half reliability coefficient was 0.939. All subdimension reliability coefficients exceeded the 0.70 acceptability threshold. Intra-rater reliability was high for both observers and both component types. Inter-rater reliability for femoral rotation measurements was moderate to good. The study interpreted very high alpha values as reflecting a focused domain-specific instrument rather than item redundancy.