Joint wear
Articular cartilage loss↓
Also searched as Articular cartilage loss.
Not simply wear. The cartilage is degraded by an active inflammatory program, and body weight feeds it chemically as well as mechanically — which is why the load you carry and the inflammation you carry both appear above it.
In depth
Progressive loss of joint cartilage with inflammation of the surrounding tissue.
What drives it
Calms inflammation increases it.
NF-κB has long been recognized as a disease-contributing factor in osteoarthritis and is an established therapeutic target: mechanical stress together with synovial inflammation drives NF-κB-dependent chondrocyte catabolism and degradation of the cartilage extracellular matrix (review, PMC6678954). Mechanism: under OA stimuli chondrocytes lose the ability to maintain cartilage integrity and convert to catabolic cells secreting matrix-degrading enzymes -- MMP-3, MMP-13, ADAMTS-4 and ADAMTS-5 -- with ADAMTS5 transcription driven by the NF-kappa-B family member RelA/p65. Loss-of-function confirms it: inhibiting NF-kappa-B activation significantly rescued expression of both the inflammatory cytokines and the cartilage-degradation enzymes in stimulated chondrocytes. the downstream proteases are not merely effectors -- MMPs and ADAMTS can propagate inflammatory signaling and amplify cartilage damage independently of cytokine activity, so blocking NF-kappa-B upstream does not necessarily stop them. PMC6678954
Supports weight management increases it.
Body weight acts on the joint metabolically as well as mechanically: obesity raises pro-inflammatory cytokines and degrading enzymes that inhibit cartilage matrix synthesis, and metabolic syndrome and osteoarthritis share inflammatory-aging, oxidative-stress and lipid-metabolism mechanisms. PMC4842398
Calms body-wide inflammation increases it.
bone remodeling is a critical physiological process that maintains skeletal integrity, repairs micro-damage, and regulates mineral homeostasis, relying on the coordinated actions of bone-resorbing osteoclasts, bone-forming osteoblasts, and osteocytes serving as mechanosensors. PMC10648156
Immune support reduces it.
Named across six reviews of bone remodeling and osteoarthritis pathogenesis. Bone remodeling relies on the coordinated actions of bone-resorbing osteoclasts, bone-forming osteoblasts, and osteocytes serving as mechanosensors and local remodeling coordinators. PMC10648156
Cellular aging increases it.
Named across six reviews of bone remodeling and osteoarthritis pathogenesis. Bone remodeling relies on the coordinated actions of bone-resorbing osteoclasts, bone-forming osteoblasts, and osteocytes serving as mechanosensors and local remodeling coordinators. PMC10648156
Tissue remodeling reduces it.
The subchondral bone is as involved as the cartilage: an abnormal expression of OPG and RANKL has been described in osteoarthritis osteoblasts, which is responsible for abnormal bone remodeling and decreased mineralization. And the direction splits by subtype: low osteoarthritis osteoblasts show decreased OPG and increased RANKL, while high osteoarthritis osteoblasts show increased OPG and reduced RANKL. Two phenotypes, opposite ratios, one node here. The authors are blunt: osteoarthritis pathogenesis is still poorly understood and there ARE NO treatments available to repair degraded cartilage and altered bone. PMC10648156
Joint comfort reduces it.
Named across six reviews of bone remodeling and osteoarthritis pathogenesis. Bone remodeling relies on the coordinated actions of bone-resorbing osteoclasts, bone-forming osteoblasts, and osteocytes serving as mechanosensors and local remodeling coordinators. PMC10648156
Inflammatory alarm increases it.
C. acnes promotes inflammation via TLR2 and TLR4; TLR signals induce NF-kB-dependent expression of NLRP3, pro-IL-18 and pro-IL-1beta. Androgens raise sebum secretion, triggering acne. doi 10.21037/atm-22-1362 · PMC2904443
Estrogen balance increases it.
Named across six reviews of bone remodeling and osteoarthritis pathogenesis. Bone remodeling relies on the coordinated actions of bone-resorbing osteoclasts, bone-forming osteoblasts, and osteocytes serving as mechanosensors and local remodeling coordinators. PMC10648156
Clears worn-out cells increases it.
Named across six reviews of bone remodeling and osteoarthritis pathogenesis. Bone remodeling relies on the coordinated actions of bone-resorbing osteoclasts, bone-forming osteoblasts, and osteocytes serving as mechanosensors and local remodeling coordinators. PMC10648156
Oxidative stress increases it.
Named across six reviews of bone remodeling and osteoarthritis pathogenesis. Bone remodeling relies on the coordinated actions of bone-resorbing osteoclasts, bone-forming osteoblasts, and osteocytes serving as mechanosensors and local remodeling coordinators. PMC10648156
Cell turnover increases it.
Named across six reviews of bone remodeling and osteoarthritis pathogenesis. Bone remodeling relies on the coordinated actions of bone-resorbing osteoclasts, bone-forming osteoblasts, and osteocytes serving as mechanosensors and local remodeling coordinators. PMC10648156
Reduces scarring increases it.
Named across six reviews of bone remodeling and osteoarthritis pathogenesis. Bone remodeling relies on the coordinated actions of bone-resorbing osteoclasts, bone-forming osteoblasts, and osteocytes serving as mechanosensors and local remodeling coordinators. PMC10648156
Tissue renewal increases it.
Named across six reviews of bone remodeling and osteoarthritis pathogenesis. Bone remodeling relies on the coordinated actions of bone-resorbing osteoclasts, bone-forming osteoblasts, and osteocytes serving as mechanosensors and local remodeling coordinators. PMC10648156
What it drives
It reduces Training load.
Joint pain reduces the exercise a person can sustain. This link is drawn from the reviews of this outcome rather than from a dedicated trial, and no effect size specific to this link has been reported.
It reduces Joint comfort.
NBK482326 — Joint function is the proximate consequence. Close to definitional and said so.
It reduces Mood.
10.2147/NDT.S346183 — This is what the symptom costs rather than what it causes physiologically. It is shown at reduced weight because no separate effect size has been reported for this arm. The asymmetry is deliberate and stated. Chronic pain and mood co-travel. This link rests on the reviews of this outcome as a whole, and no effect size specific to it has been reported. doi 10.2147/NDT.S346183
It reduces Physical performance.
10.1038/s41572-025-00594-6 — This is what the symptom costs rather than what it causes physiologically. It is shown at reduced weight because no separate effect size has been reported for this arm. The asymmetry is deliberate and stated. Joint pain limits capacity. doi 10.1038/s41572-025-00594-6
It reduces Sleep.
10.1093/rheumatology/keag412 — Night pain disrupts sleep. Low. doi 10.1093/rheumatology/keag412
Blends that modulate it
Each blend page names this pathway and carries the study behind its claim.
See it on the map
Open the causal map to follow this pathway upstream and downstream, arrow by arrow, each with its study.