#synovial

• Arthrocele — A hernia, cystic swelling, or abnormal dilation of a joint capsule, caused by the excessive accumulation of synovial fluid or through the structural weakening of periarticular tissues. In clinical practice, this cystic mass can compress adjacent nerves and blood vessels, generating discomfort, local pain, and partial reduction in the mobility of the affected bony segment.
• Arthrocentesis — An invasive medical procedure consisting of puncturing a joint cavity using a sterile needle, performed for diagnostic purposes (to extract and analyze synovial fluid) or therapeutic purposes (to evacuate a fluid effusion or inject medications). It is a fundamental technique in rheumatology and orthopedics for the rapid evaluation of septic or microcrystalline arthritis.
• Arthrolith — A calcareous formation or mineralized calculus formed by the gradual accumulation and deposition of calcium salts inside a joint cavity or within the structure of the synovial capsule. This type of stony concretion, often secondary to chronic inflammatory processes or local metabolic disorders, acts as a foreign body that can cause constant mechanical irritation, hydrarthrosis, and progressive reduction of mobility.
• Arthroplasia — The formation, proliferation, or excessive development of new tissue, cells, or atypical fibrous structures inside the capsule of a movable joint. This localized hyperplastic or dysplastic process disrupts the normal composition of the synovial membrane and cartilage, often associated with faulty tissue remodeling reactions following chronic destructive inflammation or repetitive aberrant mechanical stimuli.
• Arthrosynovitis — An acute or chronic inflammatory process that simultaneously affects a joint and the synovial membrane lining its interior. This condition manifests through local swelling, increased pain during mobilization, elevated skin temperature, and excessive accumulation of serous or serofibrinous fluid within the joint cavity, being triggered by repetitive trauma, intense mechanical stress, or systemic rheumatic diseases.