Osteoarthritis: Symptoms, Causes, Treatment & Nursing Care

Osteoarthritis is the most common adult joint disorder—a biomechanically driven process in which failing cartilage matrix, subchondral sclerosis, osteophyte formation and sometimes meniscal/labral compromise combine to generate pain, stiffness and activity restriction. It is not simply “wear and tear”: genetic susceptibility, prior trauma, limb alignment, muscle deconditioning, adipokine signalling and local inflammation all influence progression. Nurses see OA intersect with chronic cardiometabolic burden—people living with type 2 diabetes and central adiposity frequently present with hip/knee symptoms where load reduction and glycaemic stability mutually matter.

Pathophysiology translates to predictable phenotypes: tibiofemoral knee pain worsened by stairs and prolonged standing, hip groin pain with internal rotation loss, first carpometacarpal pinch weakness, and facet-mediated axial symptoms when spine involvement dominates. Yet pain intensity only loosely tracks structural severity; central sensitisation and periarticular soft-tissue pathology (bursitis, tendinitis) commonly co-exist and must be addressed in rehabilitation plans.

Plain radiographs remain the workhorse for structural staging when clinical OA is suspected. Weight-bearing knee views accentuate compartment narrowing; hip films should include adequate visualisation of joint space and morphology before surgery. KL grading integrates osteophyte presence and joint-space narrowing to create a 0–4 severity ladder—useful for cohort description, surgical candidacy discussions and monitoring progression when serial imaging is warranted.

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MRI is not first-line for typical OA but clarifies meniscal root tears, osteonecroses or insufficiency fractures when symptoms, trauma or disproportionate exam findings demand it—especially before major orthopaedic planning.

Patients describe mechanical knee pain that builds with load and eases with relative rest, brief gel phenomenon after sitting, and difficulty with transfers—public transport steps, toileting, supermarket aisles. Hand OA targets the distal and proximal interphalangeal joints and base of thumb, often with aching fine-motor tasks.

• Typical cues: <30 minutes joint stiffness, crepitus, joint-line tenderness, reduced range, effusions that are cool compared with inflammatory arthropathy.
• Atypical cues requiring work-up: explosive onset monoarthritis, hot effusion, constitutional symptoms, rapidly progressive deformity, radicular neuro signs, or pain waking the patient from sleep every night without positional relief.
• Older adult nuance: OA pain can mask osteoporosis-related insufficiency fracture—ask about trauma, steroid exposure, and compare weight-bearing ability day-to-day; low-energy fall with new groin pain still warrants urgent imaging in many pathways.
• Overlap: Centralised fibromyalgia-type pain amplifies OA severity scores—managing sleep, mood and pacing is part of realistic goal setting.

OA risk scales with age and joint-specific loading history. Prior meniscectomy, ACL disruption, occupational kneeling, elite cutting sports and malalignment increase knee hazard; femoroacetabular impingement morphology and dysplasia influence hip outcomes. Metabolic factors—adiposity, insulin resistance, urate handling—interact with innate immunity to sustain low-grade synovitis.

• Non-modifiable: age, female sex after midlife, genetic predisposition, congenital morphology.
• Modifiable: excess weight, muscle weakness, repetitive joint overload, untreated misalignment, Vitamin D deficiency in fracture-risk contexts, and glycaemic exposure in diabetes.
• Secondary OA: sequela of septic arthritis, haemarthrosis, osteonecrosis or prior malunion—history changes surveillance intensity.

Clinical assessment

Diagnosis rests on typical symptoms plus exam findings; clinicians use validated tools (e.g., WOMAC, KOOS) when auditing intervention response. Gait observation, quadriceps bulk, fixed flexion deformity and neurovascular status matter for perioperative planning.

Laboratory investigations

Routine blood tests are not required for classic presentations. If inflammatory features exist, add ESR/CRP, CBC,RF/anti-CCP, urate and serologies as indicated by local rheumatology pathways.

Imaging

Weight-bearing radiographs confirm structural OA and grade progression; ultrasound may identify effusion or bursal distension; MRI clarifies competing diagnoses as noted above.

Criteria and phenotyping aids

ACR clinical/radiographic criteria historically standardised research cohorts; in practice, integrate history, exam and plain films while ruling out mimics.

• Inflammatory arthritis: Rheumatoid arthritis—symmetric small-joint synovitis, prolonged morning stiffness, extra-articular features.
• Crystal disease: Gout or pseudogout—acute erythematous, exquisitely tender joint; crystal analysis when uncertain.
• Periarticular pain: Greater trochanteric pain syndrome, patellar tendinopathy—localized tenderness off joint line.
• Infection/malignancy: Septic joint, osteomyelitis, metastasis—systemic features, night pain, risk factors.
• Spine emergencies: Cauda equina compression—saddle anaesthesia, urinary retention (escalate urgently).

First-line non-pharmacologic management

Guideline panels consistently place education, exercise, and tailored physical activity ahead of drug therapy for hip/knee OA. Land-based strengthening and neuromuscular programmes, tai chi, and aquatic therapy when load tolerance is low all have evidence for modest pain/function gains; supervised formats often outperform handouts alone. Combine with realistic pacing, mobility assessment for assistive devices, cane training off the contralateral side for hip/knee unloading, and orthotics when deformity dictates.

For people with overweight or obesity, even ~5% weight loss can improve knee/hip symptoms—coordinate dietitian input when available and document goal weights to prevent “diet by rumor.”

Pharmacologic analgesia (acute and maintenance)

• Topical NSAIDs: First-line for many knee/hand presentations because systemic exposure stays lower—still monitor skin integrity and remember partial systemic uptake.
• Oral NSAIDs: Ibuprofen, naproxen, celecoxib and diclofenac remain common choices—pair with gastroprotection when risk factors exist, avoid combining multiple NSAIDs, and reassess renal function, BP and edema within days-to-weeks of initiation.
• Analgesic adjuncts: Acetaminophen may suit patients with NSAID contraindications but expectations for OA pain relief are modest; duloxetine helps centralized pain phenotypes when antidepressant indication aligns.
• Tramadol / opioids: Tramadol carries a conditional role for selected refractory cases; non-tramadol opioids are generally discouraged due to dependence and mortality risk—if escalation occurs, document functional goals, bowel regimen and safety plans.

Injections and procedural bridges

Intra-articular corticosteroid after infection is excluded can dampen knee/hip flares for weeks—counsel on post-injection transient glucose rise in diabetes and cartilage caution with very frequent repeat injections. Hyaluronic acid, platelet-rich plasma and stem-cell marketing often exceed current guideline support; follow formulary governance.

Surgical management

Partial meniscectomy purely for degenerative tears without mechanical locking rarely beats structured rehab; osteotomy realigns loads in selected varus/valgus knees with intact cartilage opposite compartment; total/partial joint arthroplasty resolves end-stage pain when perioperative optimization and rehabilitation bandwidth are in place.

• Visit 0 (triage): Pattern recognition for inflammatory mimics; vitals if systemic features; medication reconciliation focusing on anticoagulants, diuretics, ACE inhibitors and prior NSAID intolerance.
• Visit 1 (plan): Refer to physiotherapy; quantify baseline WOMAC/KOOS or timed up-and-go; ensure plain films if diagnosis uncertain; counsel on flare plan (activity modification, topical NSAID, ice/heaviness relief).
• Drug safety cadence: Oral NSAID courses need documented stop dates, gastric protection criteria, renal monitoring in CKD stage ≥3, and HF/BP surveillance.
• Injection pathway: Confirm no septic suspicion, anticoagulation per institutional protocol, post-procedure glucose checks when diabetes present.
• Referral triggers: Locked knee, progressive deformity, neurovascular compromise, failure of 3–6 months optimised conservative care with disabling symptoms—synchronise expectations for surgical wait times.
• Frailty & bone health: Integrate DEXA/bone-health planning when age, steroids, or recurrent falls intersect OA care.

• Persistent effusions, Baker cyst rupture mimicking DVT, falls from pain-driven gait changes.
• Peptic ulceration, AKI, HF exacerbation from NSAIDs or high-dose diuretic interplay.
• Post-arthroplasty infection, VTE, periprosthetic fracture—follow enhanced recovery protocols.
• Depressive symptoms and social isolation from progressive disability.

Primary prevention targets healthy weight maintenance, joint protection after sport injury (complete rehab before return-to-play), and occupational ergonomic mitigation. Secondary prevention emphasises maintaining quadriceps and hip abductor strength once early OA is recognised to slow functional decline even when structural disease advances.

OA is chronic and variable—some patients plateau for years with structured exercise; others progress radiographically without proportional pain change. Transparent communication about realistic analgesic effect sizes (NSAIDs, injections) reduces disappointment and early opioid exposure. Surgical outcomes are generally strong for appropriately selected candidates,but complications and rehab effort deserve explicit discussion.

Translate guideline bundles into nursing documentation: record mechanical symptoms, assistive device need, education provided, falls episodes, pain scores at rest vs activity, and adherence barriers (cost, transport, cognition). Watch for the depressed postoperative patient who mobilises poorly despite acceptable vitals—early physio engagement prevents VTE and hospital-associated deconditioning. When patients attribute every flare to “humidity,” refocus the conversation onto modifiable loaders (steps, weight, spike in vigorous activity) while validating symptom experience.