Document Detail

The Effect of Arthroscopic Partial Medial Meniscectomy on Tibiofemoral Stability.
MedLine Citation:
PMID:  23149019     Owner:  NLM     Status:  Publisher    
BACKGROUND:There is still little known regarding the effects of meniscus resection size on tibiofemoral stability. PURPOSE:To determine if partial medial meniscectomy of the posterior horn significantly alters tibiofemoral stability as measured by the anterior-posterior (AP) position and laxity of the medial femoral condyle. STUDY DESIGN:Controlled laboratory study. METHODS:Five cadaveric knees were dissected to the capsule, preserving all ligaments and the quadriceps tendon. Each specimen was first tested on a rig where the AP position and laxity of the medial femoral condyle were measured while a range of forces was applied from full extension to 90° of flexion. Magnetic resonance imaging (MRI) at 3 tesla was then performed for baseline measurements of the meniscus before partial meniscectomy. Arthroscopic partial medial meniscectomy aimed at 30% of the posterior horn was then performed, followed by repeat mechanical testing and MRI. The sequence was then repeated for arthroscopic partial meniscectomy aimed at 60% and 100% of the posterior horn of the medial meniscus. RESULTS:The MRI analysis demonstrated that 22% ± 9% of the original width of the posterior horn was removed at the first resection, 46% ± 11% was removed at the second resection, and the third resection was 100% removal of the posterior horn for all specimens. After 22% resection, no significant difference in AP laxity was observed. A statistically significant increase in AP laxity was observed with 46% resection under a 500-N compressive load compared with the intact meniscus. After full resection, significant increases in AP laxity were observed under a 50-N compressive load compared with the intact and 22% and 46% resections. The 22% resection had similar AP positions as the intact knee, whereas the 46% resection and 100% removal of the posterior horn had statistically further posterior AP positions than the intact knee. CONCLUSION:Partial medial meniscectomy with ≥46% resection of the original width of the posterior horn significantly altered the AP position of the medial femoral condyle and also increased laxity. CLINICAL RELEVANCE:These mechanical changes may lead to abnormal cartilage loading and early osteoarthritis.
Sally Arno; Scott Hadley; Kirk A Campbell; Christopher P Bell; Michael Hall; Luis S Beltran; Michael P Recht; Orrin H Sherman; Peter S Walker
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-13
Journal Detail:
Title:  The American journal of sports medicine     Volume:  -     ISSN:  1552-3365     ISO Abbreviation:  Am J Sports Med     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7609541     Medline TA:  Am J Sports Med     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Department of Orthopaedic Surgery, New York University Hospital for Joint Diseases, New York, New York.
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