To investigate the effects of Hyaluronic acid (HA) on early rehabilitation of patients with isolated anterior cruciate ligament (ACL) reconstruction.
Randomized, controlled clinical trial.
A total 120 patients with isolated ACL injury who had received patellar tendon autograft reconstruction were randomly assigned to four groups (groups I-IV), with 30 subjects in each group.
All patients received 16 weeks of a regular rehabilitation program and an intra-articular injection of HA or saline weekly for 3 weeks. Additionally, patients in group I received the HA commencing at 4 weeks after surgery, patients in group II at 8 weeks, and patients in group III at 12 weeks. Patients in group IV did not receive HA but did receive the same volume of normal saline as control subjects at 4 weeks after surgery. The rehabilitation program started at the same time after surgery for all groups.
Outcomes were measured at 4, 8, 12, and 16 weeks after reconstruction, and at follow-up 1 year later. These included the changes in Lysholm knee scoring scale, knee range of motion, ambulation speed (AS), and muscle peak torque (MPT) of knee flexion and extension.
There were improvements in groups I-III shortly after receiving the HA, but not in the saline group (group IV). Patients in groups II and III showed more improvement in AS and MPT after rehabilitation program and at follow-up. Besides, the best results 1 year later occurred in the group receiving HA at 8 weeks after surgery (group II).
HA therapy results in more functional and MPT improvement in ACL rehabilitation, and the intervention at 8 weeks after surgery results in the best outcome.
From the *Departments of Physical Medicine and Rehabilitation, Kaohsiung Medical University Hospital, Faculty of Medicine (M-H.H); †Faculty of Sport Medicine (R-C.Y.); and ‡Department of Orthopodic Surgery, Kaohsiung Medical University Hospital, Faculty of Medicine (P-H.C.), College of Medicine, Kaohsiung Medical University, Taiwan.
Submitted for publication September 28, 2006; accepted April 3, 2007.
Funded by a project grant from the National Science Council of Taiwan.
Reprints: Mao-Hsiung Huang, MD, PhD, Department of Physical Medicine and Rehabilitation, Kaohsiung Medical University Hospital, No.100 Tzyou 1st Road, Kaohsiung 807, Taiwan (e-mail: email@example.com).