Arthroscopy: The Journal of Arthroscopic & Related Surgery
Original ArticleBone Contusions After Acute Noncontact Anterior Cruciate Ligament Injury Are Associated With Knee Joint Laxity, Concomitant Meniscal Lesions, and Anterolateral Ligament Abnormality
Section snippets
Patient Selection
From January 1, 2011, to December 31, 2013, patients who underwent ACL reconstructions performed by the senior author (H.F.) were included and analyzed. Patients were excluded from the present analyses if they (1) had undergone previous surgery on the affected knee; (2) had undergone an MRI more than 6 weeks from injury; (3) had undergone ACL reconstruction more than 3 months from the time of injury; (4) had partial ACL tear confirmed under diagnostic arthroscopy (defined as less than 50% of
Demographic Data
Among the 697 consecutive cases, 193 were finally selected (Fig 1). The mean time from injury to surgery was 4.8 weeks (range, 0.5 to 10.5 weeks). The mean age at surgery was 32.3 years (range, 15 to 55 years), and the mean BMI was 23.8 (range, 16.8 to 39.6). Moreover, 11.9% (n = 23) of the patients had their MRI scans at other hospitals.
Descriptive Statistics
Results of physical examinations under anesthesia before surgery revealed that 72.1% of patients (n = 139) showed >5 mm (abnormal/severely abnormal) SSD of
Discussion
The principal findings of this study were 3-fold. First, the overall prevalence of bone contusions at each anatomic site seen on MRI in our sample was as follows: 60.6% LFC, 73.1% LTP, 6.2% MFC, and 21.2% MTP. Second, the presence (present vs absent) of bone contusions at LFC and LTP after acute noncontact ACL injuries were significantly associated with high-grade (grade II and III) pivot-shift, concomitant lateral meniscal lesions and ALL abnormality. Third, the severity (moderate/severe vs
Conclusions
For acute noncontact ACL injury, both the presence and the severity of lateral bone contusions are associated with high-grade (grade II and III) pivot-shift, concomitant lateral meniscal lesions, and ALL abnormality.
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The authors report the following potential conflict of interest or source of funding: G-y.S. and H.F. receive support from the National Natural Science Foundation of China (81572153).