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The 100% response rate confirmed ease of use. There were no redundant items. There were strong correlations between the 12-item and longer versions (0.9). The HOOS-12 and KOOS-12 scores were reliable and valid 1) there were no ceiling or floor effects for pre- or postoperative KOOS-12 scores, although a ceiling effect was found for HOOS-12 postoperatively (20% of patients having maximum scores of 10; 2) internal consistency was confirmed, with Cronbach alpha0.8; 3) external consistency between Oxford-12 and HOOS-12/KOOS-12 wa