Abstract
Persistent quadriceps weakness prevents patients from returning to sports after
ACL reconstruction. Pre-operative quadriceps strength was indicated as an
important factor for the outcomes of ACL reconstruction. However, the existing
evidence is controversial. Therefore, this systematic review was conducted to
summarize and evaluate the relationship between pre-operative quadriceps
strength and the outcomes following ACL reconstruction, and to summarize the
predictive value of pre-operative quadriceps strength for satisfactory
post-operative outcomes. Pubmed, WOS, Embase, CINAHL and SportDiscus were
searched to identify eligible studies according to PRISMA guidelines. Relevant
data was extracted regarding quadriceps strength assessment methods,
pre-operative quadriceps strength, participants treatment protocols,
post-operative outcomes, follow-up time points and the relevant results of each
individual study. Twelve cohort studies (Coleman methodology score:
62±10.4; from 44–78) with 1773 participants included. Follow-up
period ranged from 3 months to 2 years. Moderate evidence supports the positive
association between pre-operative quadriceps strength and post-operative
quadriceps strength; weak evidence supports the positive association between
pre-operative quadriceps strength and post-operative functional outcomes. By
now, there is no consensus on the predictive value of pre-operative quadriceps
strength for achieving satisfactory quadriceps strength after ACLR. To conclude,
pre-operative quadriceps strength should be taken into consideration when
predict patient recovery of ACLR.
Key words
anterior cruciate ligament - quadriceps strength - systematic review