Osteoarthritis of the Knee: Symptoms, Diagnosis, Treatment & Recovery

What Is Knee Osteoarthritis?

Osteoarthritis (OA) of the knee is a degenerative joint condition where the smooth articular cartilage gradually thins and the joint becomes inflamed and stiff. Over time, this can cause pain, swelling, reduced movement, and difficulty with stairs, hills, or longer walks.

• Compartments affected: medial, lateral, and/or patellofemoral (kneecap) compartments.
• Mechanics matter: alignment (bow-leg/knock-knee), muscle strength, and previous injuries influence progression.

Common Symptoms

• Aching pain with activity; morning or start-up stiffness.
• Swelling and warmth during flares; possible Baker’s cyst.
• Grinding or crepitus, reduced range of motion.
• Difficulty with stairs, kneeling, or prolonged standing/walking.
• Night pain after busy days; occasional giving-way due to pain inhibition.

Why Knee OA Develops — Causes & Risk Factors

• Age & genetics—cartilage resilience changes over time.
• Prior injury—meniscal tears, ligament damage, fractures.
• Alignment & biomechanics—varus/valgus load concentration.
• Body weight—excess load increases joint stress.
• Occupational/sport loading—kneeling, squatting, heavy lifting.
• Inflammatory/metabolic contributors—gout/CPPD, diabetes, lipid disorders.

How We Diagnose Knee Osteoarthritis

Diagnosis integrates your history, a focused knee examination, and imaging to stage disease and guide treatment.

Clinical assessment

• Gait, alignment (varus/valgus), range of motion, joint line tenderness.
• Ligament stability and meniscal signs; patellofemoral tracking.

Imaging

• X-rays (standing views) for joint space, osteophytes, alignment.
• MRI (selected cases) if symptoms exceed X-ray changes, to assess cartilage/meniscus or to exclude other causes.

Non-Operative Treatment (First-Line)

Many people improve with a structured plan targeting pain, function, and joint loading. We work closely with our physiotherapy team.

1) Education & activity modification

• Adjust hills, stairs, prolonged standing; split errands into shorter bouts.
• Use cross-training (bike, pool) during flares to maintain fitness with lower joint load.

2) Exercise therapy

• Strength: quadriceps/VMO, gluteals, hamstrings, calves.
• Mobility: gradual range-of-motion restoration; patellofemoral flexibility.
• Neuromuscular control: balance, step-downs, gait re-training.

3) Weight management & lifestyle

• Even a 5–10% body-weight reduction can meaningfully reduce symptoms.
• Footwear/orthoses review and workplace ergonomics as needed.

4) Bracing & aids

• Unloader braces for unicompartmental OA; simple knee sleeves for warmth/proprioception.
• Walking poles or a stick during flares to share load.

5) Medications & injections

• Short, targeted use of analgesics/anti-inflammatories if appropriate.
• Corticosteroid injection may help short-term flares to enable rehab.
• Hyaluronic acid and PRP can be considered in selected patients after discussion of evidence and goals.

Timeline: With consistent rehab and load modification, many patients notice improvement within 6–12 weeks. Failure to progress or severe structural disease may prompt surgical discussion.

Is Arthroscopy Useful for Knee OA?

Arthroscopy is not a routine treatment for established osteoarthritis. It may be considered only in selected scenarios (e.g., true locking from a displaced meniscal fragment or loose body) after specialist review.

Surgical Treatment for Advanced Knee OA

When pain and function remain unacceptable despite best non-operative care, knee replacement provides reliable relief. We tailor surgery to your pattern of disease, alignment, and activity goals.

• Partial (unicompartmental) knee replacement for isolated medial/lateral disease in suitable alignment and ligaments.
• Patellofemoral replacement for isolated kneecap arthritis in selected patients.
• Total knee replacement (TKR) when multiple compartments are involved.
• Technique: quadriceps-sparing subvastus approach, personalised alignment philosophy, and enhanced-recovery protocols.

Risks & considerations

• Infection, bleeding, clots (rare), stiffness, wound issues.
• Residual discomfort or numbness; very small risk of persistent pain or revision.
• Implant longevity is excellent; activity guidance optimises long-term success.

Learn more: Knee Replacement.

Recovery & Rehabilitation

Recovery depends on your starting point and chosen treatment:

1. Non-operative: progressive strength and mobility over weeks; flare-up strategies to stay active.
2. After partial knee replacement: walking with aids immediately; many resume daily activities within 3–6 weeks depending on goals.
3. After total knee replacement: enhanced recovery pathway; functional milestones improve over 6–12 weeks, with strength/endurance gains for months.

Prevention & Self-Care

• Build lower-limb strength and balance; progress training loads gradually.
• Choose low-impact cardio on recovery days (bike, pool, elliptical).
• Maintain a healthy weight; prioritise sleep and general health.
• Seek early review for new or worsening symptoms to avoid avoidable de-conditioning.

When Should I See a Knee Specialist?

Book a review if you have persistent pain, swelling, or stiffness affecting work, sleep, or mobility. Early, tailored treatment supports a more active, independent life.

Knee Osteoarthritis — FAQs