Subchondral Bone Cyst Development in Osteoarthritis: From Pathophysiology to Bone Microarchitecture Changes and...

Area of Science:

• Orthopedics
• Rheumatology
• Cell Biology

Background:

• Osteoarthritis (OA) is a degenerative joint disease impacting middle-aged and elderly individuals, primarily affecting weight-bearing joints.
• Common OA manifestations include cartilage defects, joint space narrowing, osteophytes, bone sclerosis, and subchondral bone cysts (SBCs).
• SBCs are associated with OA progression, clinical symptoms, and potential complications after joint replacement surgery.

Purpose of the Study:

• To investigate the pathophysiology behind subchondral bone cyst (SBC) development in osteoarthritis (OA).
• To explore the relationship between SBCs and OA disease progression, clinical symptom severity, and postoperative outcomes.
• To assess the risk of complications following joint replacement if SBCs remain untreated.

Main Methods:

• A comprehensive literature review was performed using PubMed to gather evidence on SBC formation and its implications in OA.
• The review evaluated existing theories on SBC pathogenesis, including matrix metalloproteinases (MMPs) secretion, angiogenesis, and bone turnover.
• The study assessed the impact of various therapeutic interventions on SBCs and OA progression.

Main Results:

• Several theories explain SBC formation, involving MMPs secretion, angiogenesis, and heightened bone turnover as responses to mechanical stress and tissue injury.
• Novel therapeutic approaches, including celecoxib-coated microspheres, IGF-1 administration, and activated chondrocytes post-debridement, show promise in managing SBCs.
• These treatments appear to inhibit SBC expansion and mitigate OA progression.

Conclusions:

• Subchondral bone cysts (SBCs) are a significant feature of osteoarthritis, linked to disease severity and treatment outcomes.
• Understanding the pathophysiology of SBCs is crucial for developing effective management strategies.
• Emerging therapeutics demonstrate potential in halting SBC growth and slowing the advancement of osteoarthritis, improving patient prognosis.