Abstract:
CONTEXT:Quadriceps weakness is associated with disability and aberrant gait biomechanics following anterior cruciate ligament reconstruction (ACLR). Strength sufficiency cutoff scores, that normalize quadriceps strength to the mass of an individual, are capable of predicting individuals who will report better function following ACLR. Yet, it remains unknown if gait biomechanics differ between individuals who meet a strength sufficiency cutoff (strong) compared to those who do not (weak). OBJECTIVE:Determine if vertical ground reaction force (vGRF), knee flexion angle (KFA) and internal knee extension moment (KEM) differ between strong and weak individuals with an ACLR throughout stance phase of walking. DESIGN:Comparison-control. SETTING:Laboratory Participants: Individuals who received unilateral ACLR ≥12 months prior to testing were dichotomized into strong (n=31) and weak groups (n=116). MAIN OUTCOME MEASURES:Maximal isometric quadriceps strength was collected at 90° of knee flexion using an isokinetic dynamometer and normalized to body mass. Individuals demonstrating ≥3.0Nm/kg were considered strong. Three-dimensional gait biomechanics were collected at a self-selected walking speed. Biomechanical data were time-normalized to 100% of stance phase. vGRF were normalized to body weight (BW), and KEM was normalized to BW*height. Pairwise comparison functions were calculated for each outcome to identify between-group differences for each percentile of stance. RESULTS:vGRF was significantly greater in weak participants for the first 22% of stance (average difference of 6.2% BW) and lesser in weak participants between 36-43% of stance (1.4% BW). KFA was significantly greater (i.e., more flexion) in strong participants between 6-62% of stance (2.3°) and lesser (i.e., less flexion) between 68-79% of stance (1.0°). KEM was significantly greater in strong participants between 7-62% of stance (0.007 BW*height). CONCLUSIONS:ACLR individuals able to generate knee extension torque ≥3.0Nm/kg exhibit different biomechanical gait profiles compared to weak individuals, which may allow for better energy attenuation following ACLR.
journal_name
J Athl Trainjournal_title
Journal of athletic trainingauthors
Pietrosimone B,Davis-Wilson HC,Seeley MK,Johnston C,Spang JT,Creighton RA,Kamath GM,Blackburn JTdoi
10.4085/425-20subject
Has Abstractpub_date
2021-01-22 00:00:00eissn
1062-6050issn
1938-162Xpii
451543pub_type
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