J Knee Surg 2016; 29(07): 539-542
DOI: 10.1055/s-0036-1593341
Special Focus Section
Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

Hot Topics in the Multicenter Orthopedics Outcomes Network: Anterior Cruciate Ligament

Robert W. Westermann
1  Department of Orthopaedic Surgery, University of Iowa, Iowa City, Iowa
Thomas Sean Lynch
2  Department of Orthopaedic Surgery, Sports Medicine, Columbia University Medical Center, New York, New York
Kurt P. Spindler
3  Department of Orthopaedic Surgery, Cleveland Clinic Sports Health Center, Garfield Heights, Ohio
› Author Affiliations
Further Information

Publication History

06 July 2016

02 August 2016

Publication Date:
19 September 2016 (online)


Since 2015, the Multicenter Orthopedic Outcomes Network (MOON) has addressed several factors associated with patient outcome after anterior cruciate ligament (ACL) injury. These factors include predictors of high grade knee laxity, the impact of meniscus treatment on joint space narrowing after surgery, graft selection, treating diabetic patients, predictors of clinically significant pain, and outcomes of patients where meniscus tears were left in situ without treatment. The presence of meniscus tears and generalized laxity predict a lax examination under anesthesia prior to surgery. Allograft reconstructions carry a 5.2 times increased risk of re-tear compared to autograft. Patients with diabetes should be counseled they may be at increased risk (odds ratio 18.8) for infection after surgery. Subsequent ipsilateral knee surgery is the strongest predictor of postoperative pain after ACLR. Stable, partial thickness meniscus tears measuring less than 1 cm can be left alone without treatment with low re-operation rates at 6-years.