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  • Title: Micheli Anterior Cruciate Ligament Reconstruction in Skeletally Immature Youths: A Retrospective Case Series With a Mean 3-Year Follow-up.
    Author: Willimon SC, Jones CR, Herzog MM, May KH, Leake MJ, Busch MT.
    Journal: Am J Sports Med; 2015 Dec; 43(12):2974-81. PubMed ID: 26498959.
    Abstract:
    BACKGROUND: The management of anterior cruciate ligament (ACL) tears in the skeletally immature patient remains controversial. Outcomes on a physeal-sparing technique using the iliotibial band for combined intra-articular and extra-articular ACL reconstruction, called the Micheli technique, have been described and reported by the original authors. PURPOSE: To evaluate the clinical outcomes of a physeal-sparing technique using the iliotibial band for combined intra-articular and extra-articular ACL reconstruction. STUDY DESIGN: Case series; Level of evidence, 4. METHODS: Between 2005 and 2011, all patients who underwent Micheli ACL reconstruction performed by a single surgeon were identified. A minimum of 3 years' growth remaining was a prerequisite for Micheli reconstruction. Patients were excluded if postoperative follow-up was less than 1 year. Patients were evaluated for functional outcomes, satisfaction, graft survival, radiographic and clinical evidence of growth disturbance, and the need for additional procedures. RESULTS: Twenty-one patients (22 knees) met the inclusion criteria for this study. The mean age at the time of surgery was 11.8 years (range, 9.9-14.0 years). All patients were male. There were 4 concomitant meniscal repairs and 5 partial meniscectomies performed. All patients (100%) completed follow-up at a mean duration of 3.0 years (range, 1.0-6.9 years). Overall, 6 knees (27%) underwent reoperation. Of these, 3 knees (14%) underwent revision ACL surgery: 2 revision reconstructions at 2.8 and 4.0 years postoperatively and 1 graft shrinkage at 4.7 months postoperatively. Three knees (14%) underwent subsequent meniscal procedures, including 2 partial meniscectomies and 1 meniscal repair. Of the 19 knees that did not require revision ACL surgery, the median patient satisfaction score was 10 (range, 9-10). The mean Pediatric International Knee Documentation Committee score was 96.5 ± 2.9, and the mean Lysholm score was 95.0 ± 6.1. The median preinjury Tegner activity level was 8 (range, 6-10), and the median postoperative Tegner activity level was 8 (range, 6-10). Of the 19 knees that did not require revision ACL surgery, all had a normal Lachman test result, with a firm endpoint and normal pivot shift. At follow-up, 53% of knees had closed physes. There were no angular deformities or limb-length discrepancies. CONCLUSION: At a mean 3-year follow-up, the study findings confirmed excellent functional outcomes, a low ACL revision rate, and no growth disturbances. Patients returned to their preoperative activity level after reconstruction. This procedure offers a safe and effective ACL reconstruction option in children with several years of growth remaining.
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