"Double knee" can refer to two distinct concepts:
1. Double Knee Replacement Surgery
"Double knee" in a medical context refers to bilateral knee replacement surgery. This is a procedure where both knees are replaced, either simultaneously (at the same time) or in stages (at different times). As noted in sources like Hackensack Meridian Health (https://www.hackensackmeridianhealth.org/en/healthu/2023/05/12/is-double-knee-replacement-safe), this procedure carries more risks than single knee replacements but can offer certain benefits. The decision to undergo a double knee replacement is made jointly by the patient and their orthopedic surgeon, considering individual factors and potential risks. Simultaneous bilateral knee replacement is one type of double knee surgery, while staged bilateral knee replacement refers to replacing each knee at a separate time. Healthline (https://www.healthline.com/health/total-knee-replacement-surgery/bilateral) also highlights the increased risks associated with this type of surgery. The Hospital for Special Surgery (https://www.hss.edu/conditions_expert-advice-on-bilateral-knee-replacement.asp) provides further expert advice on this procedure.
2. Double Knee Pants
In the context of clothing, "double knee" describes a type of pants, typically work pants, that feature reinforced fabric over the knees. This reinforcement is designed to increase durability and protect the pants from wear and tear during activities that put stress on the knees, such as manual labor. Many workwear brands, including Carhartt WIP (https://us.carhartt-wip.com/collections/men-pants-double-knee), Dickies (https://www.dickies.com/mens-clothing/mens-double-knee-pants), Danner (https://www.danner.com/danner-kenton-double-knee-pants-olive.html), and Iron & Resin (https://ironandresin.com/products/doubleknee-journeyman-pant), offer double knee pants in various styles and materials. GQ magazine even notes that these pants are becoming a fashion trend (https://www.gq.com/story/double-knee-pants-trend). Examples include denim options like those from Oregon (https://oce.oregon.gov/double-knee-jeans-with-buttons-rigid-blue/ecomm-product-detail/422494/).
