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Changes in knee-joint kinetics seen after ACL reconstruction
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LAS VEGAS — Patients who underwent ACL reconstruction experienced continued changes in knee-joint kinetics at long-term follow-up, according to results presented at the Osteoarthritis Research Society International World Congress.
“We saw continued long-term prospective changes in knee-joint kinetics from 2 [years] to 8 years after ACL reconstruction,” Jennifer C. Erhart-Hledik, PhD, said in her presentation.
Erhart-Hledik and colleagues compared 17 patients who underwent primary, unilateral transtibial ACL reconstruction (ACLR) with a control group matched for age, sex and BMI. Patients in the ACLR group underwent baseline testing at 2 years after surgery and had follow-up testing a little before 8 years after surgery, Erhart-Hledik said. Researchers collected knee kinematics and kinetics in all patients during three walking trials and calculated the peak mean flexion moment in first and second peak knee extension moment; first peak, second peak and impulse of the knee adduction moment; and the peak internal and external rotation moments.
Results showed a significant increase in the peak knee flexion moment, as well as a significant reduction in the first and second peaks of the knee extension moment during the follow-up period.
“We also saw a trend toward a reduced second peak knee extension moment in the ACLR limb as compared to the contralateral limb,” Erhart-Hledik said.
Erhart-Hledik noted both the ACLR and contralateral limbs had a reduced peak knee flexion moment at baseline and an increase in the first peak knee extension moment compared with healthy controls. Patients who underwent ACLR had a reduced second peak knee extension moment vs. healthy patients, according to results. Erhart-Hledik noted the ACLR limb had a trend toward a reduced first peak knee adduction moment vs. the contralateral limb.
“Over the follow-up period, there was a reduction in the internal rotation moment from 2 [years] to 8 years after ACL reconstruction,” Erhart-Hledik said. “When we compared to the healthy control population, there was a reduced external rotation moment in the ACLR limb as compared to control at baseline.” – by Casey Tingle
Reference:
Erhart-Hledik JC, et al. Paper #21. Presented at: Osteoarthritis Research Society International World Congress; April 27-30, 2017; Las Vegas.
Disclosure: This study was supported by grants from the NIH.