Arthroscopic surgery is surgery performed via keyhole surgery or arthroscopy.

Arthroscopy involves tiny instruments inserted into the knee via keyhole 'portals'.
Non-specific
The term infers that the problem inside the knee was dealt with via arthroscopy, but does not specify exactly what was done.
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CLINICAL PUBLICATIONS
Arthroscopic surgery for degenerative knee: systematic review and meta-analysis of benefits and harms. Thorlund JB, Juhl CB, Roos EM and Lohmander LS. BMJ 2015; 350 doi: https://doi.org/10.1136/bmj.h2747 (Published 16 June 2015)
See also -
- Arthroscopic lavage
- Arthroscopic debridement
- Arthroscopic abrasion
- Arthroscopic meniscectomy
- Arthroscopic trochleoplasty