Corrigendum to “Altered gait mechanics are associated with severity of chondropathy after hip arthroscopy for femoroacetabular impingement syndrome” [Gait Posture 77 (2020) 175–181, (S096663621930205X), (10.1016/j.gaitpost.2019.11.003)]

Current version: 2.3.1. Joint imaging Data reduction and scoring for MRIs was performed by a single fellowship-trained musculoskeletal radiologist with 13 years of experience evaluating MRIs of patients with musculoskeletal hip disorders. Chondropathy status for participants in the FAIS group was determined with the Hip Osteoarthritis MRI Scoring System (HOAMS), which is a valid and reliable whole-joint MRI score for assessment of change in total score as well as specific tissue features [22]. This measure was originally developed for osteoarthritis [22], but has been used in non-arthritic populations [14]. Acetabular cartilage was divided into five and four sections for coronal and sagittal plane images, respectively. Each section was categorically assigned a grade of 0(no defect), 1(focal partial-thickness defect, <25 % of region), 2(focal full-thickness defect, <25 % of region), 3(several partial-thickness defects or single, large superficial defect >25 % of region), or 4(several full-thickness defects or single, large full-thickness defect >25 % of region) [22]. Participants in the FAIS group were categorized with moderate-severe chondropathy if any of the nine acetabular cartilage subsections received a score of at least two, otherwise they were categorized with no-mild chondropathy. Should now read: 2.3.1. Joint imaging Data reduction and scoring for MRIs was performed by a single fellowship-trained musculoskeletal radiologist with 13 years of experience evaluating MRIs of patients with musculoskeletal hip disorders. Chondropathy status for participants in the FAIS group was determined with the Hip Osteoarthritis MRI Scoring System (HOAMS), which is a valid and reliable whole-joint MRI score for assessment of change in total score as well as specific tissue features [22]. This measure was originally developed for osteoarthritis [22], but has been used in non-arthritic populations [14]. Cartilage was divided into five and four sections for coronal and sagittal plane images, respectively. Each section included both acetabular and femoral cartilage, and was categorically assigned a grade of 0(no defect), 1(focal partial-thickness defect, <25 % of region), 2(focal full-thickness defect, <25 % of region), 3(several partial-thickness defects or single, large superficial defect >25 % of region), or 4(several full-thickness defects or single, large full-thickness defect >25 % of region) [22]. Participants in the FAIS group were categorized with moderate-severe chondropathy if any of the nine cartilage subsections received a score of at least two, otherwise they were categorized with no-mild chondropathy. The authors would like to apologize for any inconvenience caused.