What condition reflects inflammation of the tendon sheath?

The condition that reflects inflammation of the tendon sheath is tenosynovitis. This condition specifically involves the synovial sheath that surrounds a tendon, leading to swelling, pain, and reduced range of motion. It often occurs due to repetitive motion, infection, or underlying inflammatory diseases.

In contrast, arthritis refers to inflammation of the joint itself and does not specifically target the tendon sheath. Carpal tunnel syndrome is a condition where the median nerve is compressed at the wrist, often related to the swelling of the surrounding tissues, including but not specific to tendon sheath inflammation. Tendonitis, while it involves inflammation of the tendon itself, does not specifically address the sheath surrounding the tendon.

Thus, tenosynovitis is the most accurate choice for a condition that specifically indicates inflammation of the tendon sheath.