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. 2012 Mar;22(2):116-21.
doi: 10.1097/JSM.0b013e318246ef9e.

Incidence of contralateral and ipsilateral anterior cruciate ligament (ACL) injury after primary ACL reconstruction and return to sport

Mark V Paterno  1 , Mitchell J Rauh, Laura C Schmitt, Kevin R Ford, Timothy E Hewett
Affiliations

Incidence of contralateral and ipsilateral anterior cruciate ligament (ACL) injury after primary ACL reconstruction and return to sport

Mark V Paterno et al. Clin J Sport Med. 2012 Mar.

Abstract

Objective: Incidence rate (IR) of an ipsilateral or contralateral injury after anterior cruciate ligament reconstruction (ACLR) is unknown. The hypotheses were that the IR of anterior cruciate ligament (ACL) injury after ACLR would be greater than the IR in an uninjured cohort of athletes and would be greater in female athletes after ACLR than male athletes.

Design: Prospective case-control study.

Setting: Regional sports community.

Participants: Sixty-three subjects who had ACLR and were ready to return to sport (RTS) and 39 control subjects.

Independent variables: Second ACL injury and sex.

Main outcome measures: Second ACL injury and athletic exposure (AE) was tracked for 12 months after RTS. Sixteen subjects after ACLR and 1 control subject suffered a second ACL injury. Between- and within-group comparisons of second ACL injury rates (per 1000 AEs) were conducted.

Results: The IR of ACL injury after ACLR (1.82/1000 AE) was 15 times greater [risk ratio (RR) = 15.24; P = 0.0002) than that of control subjects (0.12/1000 AE). Female ACLR athletes demonstrated 16 times greater rate of injury (RR = 16.02; P = 0.0002) than female control subjects. Female athletes were 4 (RR = 3.65; P = 0.05) times more likely to suffer a second ACL injury and 6 times (RR = 6.21; P = 0.04) more likely to suffer a contralateral injury than male athletes.

Conclusions: An increased rate of second ACL injury after ACLR exists in athletes when compared with a healthy population. Female athletes suffer contralateral ACL injuries at a higher rate than male athletes and seem to suffer contralateral ACL injuries more frequently than graft re-tears. The identification of a high-risk group within a population of ACLR athletes is a critical step to improve outcome after ACLR and RTS.

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Conflict of interest statement

The authors report no conflicts of interest.

Figures

FIGURE 1
FIGURE 1
Distribution of sport participation by ACLR Group. Some athletes participated in multiple sports, which is reflected in this figure.
FIGURE 2
FIGURE 2
Distribution of injury by game versus practice.
See this image and copyright information in PMC

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