What is the specific outcome called when a thorn penetrates a joint capsule, introducing foreign material into the synovial fluid?

Plant thorn synovitis

When a penetrating injury from a sharp object, such as a thorn, moves past the soft tissue and directly enters the capsule surrounding a joint, such as in the knuckles or wrist, a specific complication can arise known as plant thorn synovitis. This occurs because the foreign material, likely carrying debris or environmental pathogens, is introduced directly into the synovial fluid, which lubricates the joint. The body reacts to this intrusion with an intense inflammatory response directed at the joint lining, resulting in synovitis. This condition manifests as localized pain, significant swelling, and markedly limited range of motion in that specific joint, often requiring medical intervention even after the physical foreign body is removed due to the persistent irritation.