Hip and knee degeneration

What is hip and knee degeneration?

Hip and knee degeneration is the progressive wearing away of the protective cartilage, bone, and soft tissues within the joint. This structural breakdown is the root cause of osteoarthritis, the world's most common joint disease.

Joint degeneration follows a predictable structural progression:

• Early degeneration cartilage surface softening (chondromalacia), early fibrillation, and mild subchondral bone changes. Often asymptomatic or causing only mild intermittent discomfort. MRI identifies changes at this stage before X-ray abnormalities appear.

• Moderate degeneration cartilage thinning, focal full-thickness cartilage loss, subchondral sclerosis, and early osteophyte formation. Symptoms become more consistent and functionally limiting.

• Advanced degeneration severe or complete cartilage loss, large osteophytes, subchondral cyst formation, joint space narrowing visible on X-ray, and synovial inflammation. Significant pain and functional limitation. Joint replacement becomes a consideration.

While hip and knee degeneration often coexist due to shared risk factors, they cause distinctly different symptoms. Hip degeneration affects a deep ball-and-socket joint, typically triggering groin pain and limited inward rotation, whereas knee degeneration impacts a more complex, superficial joint, causing pain on the inside, outside, or front of the knee depending on exactly which section has worn down.

Symptoms of hip and knee degeneration

Symptoms develop gradually over years and vary with the severity of structural degeneration and which joint is affected.

Hip degeneration:

• Deep groin pain, sometimes referred to the front of the thigh or knee, typically aching in character

• Stiffness after rest, particularly in the morning, improving with gentle movement but worsening with sustained activity

• Reduced range of motion, particularly internal rotation and flexion, making activities like putting on shoes or socks increasingly difficult

• A limp developing as pain worsens with weight bearing

• Referred pain to the buttock or lateral hip from associated soft tissue changes

Knee degeneration:

• Pain on the medial (inner), lateral (outer), or anterior (front) aspect of the knee depending on which compartment is most affected

• Morning stiffness lasting less than 30 minutes, distinguishing it from inflammatory arthritis

• Crepitus: a grinding or clicking sensation during movement

• Swelling from reactive synovial effusion during flares

• Difficulty with stairs, prolonged walking, and rising from low chairs

• Giving way from associated weakness or meniscal involvement

What causes hip and knee degeneration?

Degeneration results from a combination of mechanical, metabolic, and genetic factors that overwhelm cartilage's limited capacity for self-repair. Contributing causes include:

• Age articular cartilage loses proteoglycan content and resilience progressively with age, making degeneration near-universal in older adults

• Obesity excess body weight dramatically increases compressive loading on weight-bearing joints. Each kilogram of body weight generates approximately three to six kilograms of force across the knee during walking

• Previous joint injury meniscus tears, ACL injuries, and intra-articular fractures significantly accelerate cartilage degeneration through altered joint mechanics and inflammatory mediator release

• Malalignment varus (bow-legged) or valgus (knock-kneed) alignment concentrates load on one compartment of the knee, accelerating focal degeneration

• Occupational and recreational loading jobs or activities involving repetitive heavy loading, kneeling, or squatting increase degeneration risk

• Genetic factors cartilage matrix composition, joint geometry, and inflammatory response all have significant heritable components

• Muscle weakness reduced quadriceps and hip abductor strength impairs dynamic joint stabilisation, increasing cartilage stress during movement

• Metabolic factors diabetes, obesity-associated chronic inflammation, and dyslipidaemia all contribute to cartilage degradation through systemic metabolic and inflammatory pathways

How is hip and knee degeneration detected?

Hip and knee degeneration is detected through targeted musculoskeletal MRI, with blood tests excluding inflammatory arthropathies and assessing metabolic risk factors.

MRI Elfcare's targeted MRI is the most sensitive imaging tool for hip and knee degeneration, catching cartilage wear, bone marrow swelling, and joint inflammation much earlier than a standard X-ray would. By imaging cartilage loss, bone cysts, and any accompanying meniscus or ligament tears directly, the scan gives a comprehensive look at the joint's overall structure. These findings help guide the treatment plan, whether that's early physiotherapy and lifestyle changes or, further down the line, surgical planning.

Blood tests cannot detect joint degeneration directly but exclude inflammatory arthropathies and assess metabolic risk factors. Relevant markers in Elfcare's panel include:

• CRP: rules out inflammatory conditions like rheumatoid, psoriatic, and reactive arthritis, while also serving as a marker for systemic inflammation that drives cartilage breakdown in osteoarthritis.

• RF: evaluates for rheumatoid arthritis to ensure joint pain isn't caused by an autoimmune condition requiring different management.

• Uric acid: excludes gout, an inflammatory arthritis that can coexist with or accelerate mechanical joint wear.

• HbA1c and glucose: assesses for diabetes, which accelerates cartilage damage through systemic inflammation and blood sugar stress.

• Vitamin D and calcium: evaluates bone and cartilage health, which are crucial for maintaining strong joint structures.

• Cholesterol, LDL, and triglycerides: checks for metabolic imbalances independently linked to increased osteoarthritis severity.

Why early detection matters

Cartilage has very limited ability to repair itself. Once it's lost, it doesn't regenerate to any meaningful degree. The shift from early cartilage softening, which is still potentially modifiable, to significant full-thickness cartilage loss, which is permanent, happens silently over years. Catching early degeneration through MRI opens the door to targeted physiotherapy, weight management, biomechanical correction, and activity changes that can significantly slow progression. Exercise-based interventions started before significant cartilage loss are far more effective than the same interventions started after advanced degeneration has set in. Identifying and treating modifiable risk factors, like weight, muscle weakness, malalignment, diabetes, and dyslipidaemia, early on can meaningfully change the trajectory of joint health over the following decades. This is one of the clearest examples of early structural assessment protecting long-term health by intervening before the window for meaningful prevention closes.

How Elfcare can help

Elfcare offers targeted hip and knee MRI for dedicated musculoskeletal assessment, providing direct visualisation of cartilage, subchondral bone, synovium, and associated structures at a level of detail that guides appropriate management from early disease through to surgical planning.

Our blood panel covers CRP, RF, uric acid, HbA1c, vitamin D, and metabolic markers, excluding inflammatory arthropathies and identifying the systemic metabolic factors most closely linked to joint degeneration progression.

If our MRI or blood tests identify significant joint degeneration or related findings, we take care of further diagnostics or refer you to the appropriate specialist.