Synovial chondromatosis of the metacarpophalangeal joint of the ring finger

Primary synovial chondromatosis is a benign metaplasia
in which synovial tissue transforms into cartilagenous
tissue. Primary synovial chondromatosis
develops from joint or tendon synovium. Secondary
synovial chondromatosis occurs with the implantation
of cartilage fragments into the tissue as a result
of degenerative disease (osteoarthritis), neuropathic
arthropathy, or trauma.[1,2] Synovial chondromatosis
is twice as common in males, and the most frequent
complaints are pain, swelling, and restricted range of
motion in the affected joint.[1] This condition may
present with findings of trigger finger or carpal tunnel
syndrome, depending on the location.[2] Synovial
chondromatosis originating from the joints most
commonly affects the knee, hip, and wrist joints,
whereas the disease originating from the tendon
sheath most frequently involves the feet and the fingers.
Primary synovial chondromatosis originating
from the metacarpophalangeal (MCP) joint is rare.[1]
In this report, we present a patient with synovial
chondromatosis originating from the MCP joint of
the ring finger.