Correlation between variables after anterior cruciate ligament reconstruction

The ACL-RSI scale consists of 12 psychological questions. Functional tests include Single-leg landing, dynamic valgus, four categories of hop tests (single, triple, side, and crossover) and modified Illinois change of direction test. The participant’s knee proprioception threshold was assessed using a proprioception test device (Sunny, AP-II, China).

Tactile sensation was assessed with a set of Semmes–Weinstein monofilaments (North Coast Medical, Inc., Morgan Hill, CA, USA). The strengths of knee flexion and extension on the affected leg were measured using the IsoMed 2000 strength testing system (D & R Ferstl GmbH, Hemau, Germany). The correlations of tactile sensation to ACL-RSI were analyzed by Spearman correlation.