In short
Keyhole knee surgery is one of the most performed orthopaedic operations in the world — and one of the most over-performed. Here is where it genuinely helps.
Arthroscopy means looking inside a joint with a camera through a small incision. In the knee it allows the surgeon to both diagnose and treat problems with minimal disruption to surrounding tissue. It is a genuinely valuable operation — for the right problems.
Where arthroscopy works well
- Meniscal tears that are causing mechanical symptoms such as locking or catching
- Meniscal repair, where a tear in the vascular zone can be stitched rather than trimmed
- ACL and other ligament reconstruction
- Loose fragments of bone or cartilage floating in the joint
- Cartilage procedures for focal defects
- Removing inflamed synovial tissue in specific conditions
Where it does not help
The most important thing to know about knee arthroscopy is where the evidence advises against it. For degenerative knee arthritis without mechanical locking, multiple high-quality trials have shown that arthroscopic washout or debridement provides no meaningful benefit over structured physiotherapy.
Trim or repair?
When a meniscal tear is treated, there are two options. Trimming removes the torn portion and gives quick relief but reduces the cushioning the meniscus provides, which matters over decades. Repair stitches the tear and preserves the meniscus, but requires a longer, protected recovery and only works where the tear has a blood supply.
In younger patients particularly, preserving meniscus is worth the slower recovery.
Recovery
For a straightforward arthroscopy, walking begins immediately, swelling settles over one to two weeks, and desk work resumes quickly. Physical work and sport take longer. A meniscal repair follows a different, more protected schedule — sometimes six weeks of limited weight bearing and restricted bending.
If you have been offered knee arthroscopy, our team will explain exactly what is intended and will say when rehabilitation is the better option.
Frequently asked questions
Does arthroscopy help knee arthritis?+
For arthritis alone, the evidence is clear that arthroscopic washout and debridement do not provide meaningful lasting benefit. It should not be offered as a treatment for osteoarthritis by itself.
How long is recovery after knee arthroscopy?+
For a simple procedure, most people walk immediately and return to desk work within one to two weeks. A meniscal repair is different and requires protected weight bearing for several weeks.
Is it done under general anaesthesia?+
It can be done under either spinal or general anaesthesia, and it is usually a day-care procedure.
This article is general health information, not medical advice, and it cannot account for your individual circumstances. Please consult a qualified orthopaedic specialist about your own symptoms before making treatment decisions.
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