BACKGROUND: Fear of reinjury and lack of confidence influence return-to-sport outcomes after anterior cruciate ligament (ACL) reconstruction. The physical, psychosocial, and functional recovery of @entity1 reporting fear of reinjury or lack of confidence as their primary barrier to resuming sports participation is unknown. PURPOSE: To compare physical impairment, functional, and psychosocial measures between subgroups based on return-to-sport status and fear of reinjury/lack of confidence in the return-to-sport stage and to determine the association of physical impairment and psychosocial measures with function for each subgroup at 6 months and 1 year after surgery. STUDY DESIGN: Case-control study; Level of evidence, 3. METHODS: @entity73 (quadriceps index [QI], quadriceps strength/body weight [QSBW], hamstring:quadriceps strength ratio [HQ ratio], @entity158 intensity), self-report of function ( @entity3538 [ @entity3538 ]), and psychosocial (Tampa Scale for Kinesiophobia-shortened form [TSK-11]) measures were collected at 6 months and 1 year after surgery in 73 @entity1 with ACL reconstruction. At 1 year, subjects were divided into "return-to-sport" (YRTS) or "not return-to-sport" (NRTS) subgroups based on their self-reported return to preinjury sport status. @entity1 in the NRTS subgroup were subcategorized as NRTS-Fear/Confidence if fear of reinjury/lack of confidence was the primary reason for not returning to sports, and all others were categorized as NRTS-Other. RESULTS: A total of 46 subjects were assigned to YRTS, 13 to NRTS-Other, and 14 to NRTS-Fear/Confidence. Compared with the YRTS subgroup, the NRTS-Fear/Confidence subgroup was older and had lower QSBW, lower @entity3538 score, and higher TSK-11 score at 6 months and 1 year; however, they had similar @entity158 levels. In the NRTS-Fear/Confidence subgroup, the @entity3538 score was associated with QSBW and @entity158 at 6 months and QSBW, QI, @entity158 , and TSK-11 scores at 1 year. CONCLUSION: @entity158 -related fear of movement/reinjury, @entity425 , and reduced @entity3538 score distinguish @entity1 who are unable to return to preinjury sports participation because of fear of reinjury/lack of confidence. Despite low average @entity158 ratings, fear of @entity158 may influence function in this subgroup. Assessment of fear of reinjury, quadriceps strength, and self-reported function at 6 months may help identify @entity1 at risk for not returning to sports at 1 year and should be considered for inclusion in return-to-sport guidelines.

XXXX , Functional, and Psychosocial Measures Based on Fear of Reinjury/Lack of Confidence and Return-to-Sport Status After ACL Reconstruction.

@entity1 :: ('9606', 'Species') :: ['Patients', 'patients'] @entity73 :: ('MESH:D003072', 'Disease') :: ['Physical impairment'] @entity3538 :: ('MESH:D002341', 'Disease') :: ['IKDC', 'International Knee Documentation Committee'] @entity425 :: ('MESH:D018908', 'Disease') :: ['quadriceps weakness'] @entity158 :: ('MESH:D010146', 'Disease') :: ['Elevated pain', 'pain']
@entity73 :: (MESH:D003072,Disease) :: ['Comparison of Physical Impairment']
