Not all joint pain comes from the cartilage on the surface of a joint. Sometimes the source lies in the bone just beneath it. Subchondroplasty is a minimally invasive procedure that has been developed to address a particular finding in this region — the bone marrow lesion. This article gives a general, educational overview of what subchondroplasty involves and the thinking behind it.
What Is Subchondroplasty?
Subchondroplasty is a minimally invasive technique in which a bone-substitute material — typically a calcium phosphate compound — is introduced into an area of bone beneath the cartilage. Calcium phosphate is one of a number of synthetic bone-substitute materials discussed in the foot and ankle surgical literature, sometimes considered alongside biologic approaches (Slater et al., 2025). The procedure is generally performed through small incisions with imaging guidance.
Understanding Bone Marrow Lesions
The finding subchondroplasty aims to address is the bone marrow lesion (BML) — an area of change within the bone just below the cartilage, typically identified on MRI. These lesions have been associated with pain and are studied as part of the wider picture of joint health (Astur et al., 2019). Because they sit beneath the cartilage rather than on its surface, they can be a less obvious source of symptoms.
How the Procedure Works
During subchondroplasty, the bone substitute is placed into the affected area, where it is intended to provide structural support to the surrounding bone. Reviews describe the technique as minimally invasive and note that, while first applied at the knee, there has been growing interest in its use in the foot and ankle (Astur et al., 2019). The specifics of any procedure depend on the individual and the treating specialist’s assessment.
Considerations and Suitability
As with any surgical procedure, subchondroplasty carries potential risks and is not appropriate for every situation. The literature notes that outcomes vary and that careful patient selection is important, with the evidence base still developing (Astur et al., 2019). An accurate diagnosis — including appropriate imaging — is an essential first step, because not all joint pain arises from bone marrow lesions.
Conclusion
Subchondroplasty is one minimally invasive option that a specialist may discuss when a bone marrow lesion is identified as a possible source of joint pain. Anyone with persistent joint symptoms should seek assessment from a qualified practitioner, who can advise whether it is appropriate for their circumstances.
References
- Slater, G., Salleh, A., Bachmid, Z., & Salleh, R. (2025). Current concepts review: Structural bone and reconstructive strategies in the foot and ankle, including regenerative hybrid alternatives, 6(1), 348–364. https://www.researchgate.net/publication/387377584_Current_Concepts_Review_Structural_Bone_and_Reconstructive_Strategies_in_the_Foot_and_Including_Regenerative_Hybrid_Alternatives
- Astur, D. C., de Freitas, E. V., Cabral, P. B., Morais, C. C., Pavei, B. S., Kaleka, C. C., Debieux, P., & Cohen, M. (2019). Evaluation and management of subchondral calcium phosphate injection technique to treat bone marrow lesion. Cartilage, 10(4), 395–401. https://pubmed.ncbi.nlm.nih.gov/29667853/
Disclaimer: This blog is for informational purposes only and should not be considered medical advice. Please consult with your healthcare provider for any questions or concerns regarding your health. All surgical or invasive procedures involve potential risks. It is advisable to seek a second opinion from a suitably qualified healthcare professional before making any decisions.
