COMPARATIVE STUDY
JOURNAL ARTICLE
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Comparison of Knee Stability and Synovial Fluid Alterations in Anterior Cruciate Ligament Reconstruction With a Hamstring Autograft or an Allograft.

Orthopedics 2017 September 2
This study compared knee stability and alterations in the composition of synovial fluid among patients who underwent arthroscopic anterior cruciate ligament (ACL) reconstruction with either a hamstring autograft or a hamstring allograft. This prospective cohort study enrolled 175 patients. Of these patients, 90 underwent hamstring tendon autograft ACL reconstruction. The remaining patients (n=85) underwent hamstring tendon allograft ACL reconstruction. All of the patients had a minimum of 1 year of follow-up (mean, 2.5 years). Side-to-side differences and the proportion of mononuclear cells in knee joint synovial fluid were measured at 5 time points (preoperatively and at postoperative weeks 1, 3, 6, and 12). During the early postoperative phase, side-to-side knee laxity was greater among the allograft group compared with the autograft group (P<.001). Additionally, among the allograft group, the proportion of mononuclear cells remained high at weeks 6 and 12 (mean, 90.0% and 88.9%, respectively) compared with a normal level in the autograft group (mean, 45.1% and 65.7%, separately). However, no significant difference was found between the 2 groups at final follow-up for range of motion, results of the Lachman test, results of the anterior drawer test, results of the pivot shift test, Lysholm score, bone tunnel enlargement, and graft failure rate (P>.05). These findings showed that, in the early postoperative phase, ACL reconstruction with a hamstring allograft resulted in greater knee laxity and immunologic response compared with the hamstring autograft group. However, at relatively long-term follow-up, both grafts achieved similar objective and subjective outcomes. [Orthopedics. 2017; 40(5):e892-e897.].

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