A partial meniscectomy is the removal of a part of a meniscus.

A partial meniscectomy may leave the outer rim intact.
The all-important outer rim
The outer rim is the most important part when it comes to absorbing and defecting the vertical forces going through the knee. If the damaged part has to be removed, the surgeon will try to at least retain the outer rim.
Synonyms:
meniscal trim
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FORUM DISCUSSIONS
Partial Meniscectomy recovery time.
Partial meniscectomy not guilty?
partial meniscectomy -- timelines for pain and activity?
CLINICAL PUBLICATIONS
The influence of synovial inflammation and hyperplasia on symptomatic outcomes up to two-years post-operatively in patients undergoing partial meniscectomy. Scanzello CR, Albert AS, DiCarlo E, Rajan KB, Kanda V, Asomugha EU, Swaim BH, Katz JN, Goldring SR, Richmond JC and McKeon B. Osteoarthritis Cartilage. 2013 Sep; 21(9): 1392–1399.