Musculoskeletal Medicines: Arthritis & Gout

Table of Contents

Musculoskeletal Medicines: Analgesics, Arthritis, Gout and Bone Safety

Why this topic matters in emergency medical care

Musculoskeletal medicines span acute pain relief, inflammation control, fracture care, gout flares, osteoporosis and autoimmune disease. EMTs must relieve suffering without worsening bleeding, kidney injury, respiratory depression or occult fracture. A hot swollen joint may be gout, septic arthritis or haemarthrosis; a “simple” back pain may be spinal cord compression. Safe medicine use begins with examination, mechanism and red-flag recognition.

This lesson supports EMT and nursing learning. Use current Uganda Ministry of Health guidance, local protocols, prescriber orders and patient-specific contraindication checks in practice.

Learning outcomes

Classify non-opioid/opioid analgesics, NSAIDs, corticosteroids, DMARDs, gout medicines, muscle relaxants and bone medicines.
Explain mechanisms, onset, routes, adverse effects, interactions and monitoring for each major class.
Recognise fracture, compartment syndrome, septic arthritis, spinal cord compression, cauda equina syndrome and neurovascular compromise.
Apply safe pain assessment, immobilisation, renal/GI/bleeding precautions and reassessment after analgesia.
Understand long-term medicines for rheumatoid arthritis, osteoarthritis, gout, osteoporosis and inflammatory disease.

1. Musculoskeletal physiology and medicine targets

Target	Effect	Medicine examples	Emergency relevance
Cyclo-oxygenase/prostaglandins	Pain, inflammation, fever, gastric and renal protection	NSAIDs, aspirin	Analgesia and anti-inflammatory effect balanced against ulcer, bleeding and AKI.
Opioid receptors	Central/peripheral analgesia and respiratory drive	Morphine, fentanyl, tramadol, naloxone	Severe pain relief but monitor ventilation and mental state.
Glucocorticoid receptors	Suppress inflammatory gene transcription	Prednisolone, dexamethasone, intra-articular steroids	Rapid anti-inflammatory effect; infection, hyperglycaemia and adrenal suppression risks.
Urate crystal/inflammation pathways	Neutrophil activation in gout	Colchicine, NSAID, corticosteroid, allopurinol	Acute flare treatment differs from long-term urate lowering.
Bone resorption/remodelling	Osteoclast and osteoblast balance	Bisphosphonates, denosumab, teriparatide, calcium/vitamin D	Fragility fracture prevention; hypocalcaemia and jaw/renal precautions.

2. Practical classification of musculoskeletal medicines

Group	Examples	Main role	Major concern
Paracetamol	Paracetamol/acetaminophen	Mild–moderate pain and fever	Liver toxicity in overdose or malnutrition/alcohol disease
NSAIDs	Ibuprofen, diclofenac, naproxen, ketorolac	Inflammatory pain, renal colic, gout	GI bleed, AKI, hypertension, heart failure and bronchospasm
Opioids	Morphine, fentanyl, codeine, tramadol	Moderate–severe acute pain	Respiratory depression, sedation, dependence and constipation
DMARDs	Methotrexate, hydroxychloroquine, sulfasalazine, leflunomide	Rheumatoid/inflammatory arthritis disease control	Immunosuppression, liver/blood toxicity and pregnancy warnings
Gout medicines	Colchicine, allopurinol, febuxostat	Acute flare and long-term urate lowering	Colchicine toxicity and incorrect initiation during acute illness
Bone medicines	Alendronate, zoledronic acid, denosumab, calcium/vitamin D	Osteoporosis and fracture prevention	Hypocalcaemia, renal impairment, oesophagitis and rare jaw problems

3. Paracetamol and multimodal analgesia

Paracetamol is useful for many acute pain presentations and can be combined with an NSAID or opioid. It has a ceiling effect, so repeating extra doses does not provide unlimited relief. Ask about combination cold/flu products, alcohol, malnutrition, liver disease and the total dose in the previous 24 hours.

Record weight and cumulative dose before giving another dose.
Suspected overdose, staggered ingestion or intentional self-harm requires urgent assessment even when the patient feels well.
Analgesia should accompany immobilisation, elevation, ice when appropriate and treatment of the underlying injury.

4. Non-steroidal anti-inflammatory drugs

Benefit	Mechanism	Important harm	Use caution/avoid
Reduce inflammatory pain	COX inhibition reduces prostaglandins	Dyspepsia, ulcer and GI bleeding	Previous ulcer, anticoagulation, steroid use or active bleeding
Relieve renal colic/gout	Suppresses inflammation and ureteric prostaglandins	AKI and sodium/fluid retention	Dehydration, CKD, shock, heart failure or pregnancy restrictions
Reduce fever/swelling	Peripheral anti-inflammatory action	Bronchospasm in aspirin-sensitive asthma	Previous NSAID reaction or uncontrolled asthma
Topical NSAID	Local exposure with lower systemic levels	Skin reactions and some systemic absorption	Broken skin, allergy and extensive use

Use the lowest effective dose for the shortest duration and consider gastroprotection when risk is high. NICE recommends NSAIDs as one first-line option for acute gout and as first-line analgesia for suspected renal colic when not contraindicated; patient-specific renal, GI and cardiovascular risk remains decisive.

5. Opioid analgesics and emergency monitoring

Medicine	Useful feature	Major risk	Monitoring
Morphine	Strong titratable analgesia	Hypoventilation, hypotension, nausea and histamine release	Respiratory rate, SpO2, ventilation, BP, GCS and pain score
Fentanyl	Rapid potent analgesia with less histamine	Apnoea, chest-wall rigidity, bradycardia	Continuous observation; prepare ventilation and naloxone.
Codeine	Oral mild–moderate pain option	Variable metabolism, sedation and constipation	Check respiratory disease, age and other sedatives.
Tramadol	Opioid plus serotonin/noradrenaline action	Seizure and serotonin syndrome risk	Ask about antidepressants, epilepsy and renal function.

5.1 Opioid safety checklist

Assess pain, airway, breathing, circulation, mental state and cause of pain before dosing.
Check allergies, opioid tolerance, alcohol/benzodiazepines, sleep apnoea, renal/hepatic disease and pregnancy.
Use the lowest authorised dose and titrate; do not repeat without a timed reassessment.
Monitor ventilation—not only oxygen saturation—because supplemental oxygen can conceal hypoventilation.
Have suction, bag-mask ventilation and naloxone access when giving parenteral opioid.

6. Muscle relaxants and spasm medicines

Muscle relaxants may reduce spasm but can cause sedation, hypotension, anticholinergic effects and falls. They should not delay examination for fracture, compartment syndrome, meningitis or spinal cord compression. Avoid combining sedating muscle relaxants with opioids or alcohol without close monitoring.

7. Osteoarthritis medicines

Osteoarthritis affects the whole joint and is managed with exercise, strengthening, weight support, education and selected medicines. NICE does not recommend routine paracetamol or weak opioids when alternatives are appropriate; topical NSAIDs may be useful for knee/hand disease, while oral NSAIDs require risk assessment.

Option	Role	Safety point
Topical NSAID	Local pain/inflammation relief	Check skin integrity and allergy; systemic absorption still occurs.
Oral NSAID	Short-term pain/inflammation when appropriate	Consider GI protection and renal/cardiovascular contraindications.
Intra-articular corticosteroid	Short-term relief for selected joints	Exclude infection first; monitor glucose and post-injection infection.
Opioid	Only selected severe pain when other measures unsuitable	Falls, dependence, constipation and respiratory depression.

8. Rheumatoid arthritis and DMARDs

Rheumatoid arthritis is systemic autoimmune inflammation. Disease-modifying antirheumatic drugs (DMARDs) prevent joint damage; analgesics reduce symptoms but do not control disease progression. Methotrexate, sulfasalazine, hydroxychloroquine, leflunomide, biologics and targeted synthetic medicines require specialist monitoring.

Medicine	Role	Key monitoring/risk
Methotrexate	Anchor DMARD for inflammatory arthritis	Weekly vs daily dosing error can be fatal; monitor CBC, liver/renal function; infection, pneumonitis and pregnancy risk.
Hydroxychloroquine	DMARD for mild RA/lupus	Retinal toxicity; baseline and ongoing eye screening.
Sulfasalazine	DMARD for peripheral inflammatory arthritis	Rash, blood dyscrasia, liver injury; monitor CBC and liver function.
Leflunomide	Immunomodulatory DMARD	Hepatotoxicity, hypertension, cytopenias and long persistence.
Biologic/targeted medicines	Block cytokines or immune pathways	Serious infection, TB/hepatitis reactivation and vaccination considerations.
Glucocorticoid bridge	Rapid inflammatory suppression while DMARD acts	Hyperglycaemia, infection, osteoporosis and adrenal suppression.

9. Gout: acute flare versus long-term prevention

Gout is caused by monosodium urate crystals. An acute flare is treated with an anti-inflammatory medicine; urate-lowering therapy prevents future flares and joint damage. A hot swollen joint with fever may be septic arthritis, so do not label it gout without appropriate assessment.

Medicine	Acute/long-term role	Safety concerns
NSAID	First-line acute flare if safe	GI bleed, AKI, heart failure, hypertension and anticoagulant interaction.
Colchicine	Acute flare and prophylaxis when starting urate lowering	GI toxicity, marrow suppression, neuromyopathy; dangerous accumulation in renal/hepatic disease and with CYP3A4/P-gp inhibitors.
Oral/intra-articular corticosteroid	Acute flare when NSAID/colchicine unsuitable	Hyperglycaemia, infection risk and joint infection must be excluded before injection.
Allopurinol	Long-term xanthine oxidase inhibition	Rash/SCAR, renal dose adjustment; do not stop/start casually during illness without advice.
Febuxostat	Alternative urate-lowering medicine	Cardiovascular and liver considerations; specialist selection.

10. Osteoporosis and fracture-prevention medicines

Medicine/class	Mechanism/role	Precautions
Calcium/vitamin D	Provide substrate and support mineralisation	Check renal stones, hypercalcaemia and total dietary intake; supplements do not replace antiresorptive therapy when indicated.
Bisphosphonates	Reduce osteoclast bone resorption	Oesophageal irritation, renal impairment, hypocalcaemia and rare jaw/atypical femur problems; take oral dose correctly.
Zoledronic acid	IV bisphosphonate for selected osteoporosis or malignancy	Renal function, hydration, acute-phase reaction and calcium monitoring.
Denosumab	RANKL inhibition reduces osteoclast formation	Hypocalcaemia and rebound vertebral fracture if stopped without follow-on plan.
Teriparatide/abaloparatide	Intermittent PTH-receptor stimulation promotes bone formation	Specialist use; monitor calcium and contraindications.

11. Musculoskeletal red flags and medication limits

Compartment syndrome: escalating pain out of proportion, pain on passive stretch, tense swelling, paraesthesia or weakness. Analgesia must not delay surgical review.
Septic arthritis: hot swollen joint, fever and severe pain with movement. Steroid injection is unsafe until infection is excluded.
Spinal cord/cauda equina compression: new weakness, saddle anaesthesia, urinary retention/incontinence or severe back pain. Urgent imaging and specialist transfer.
Fracture/neurovascular compromise: deformity, absent pulse, cool limb, sensory loss or severe swelling. Immobilise, reassess circulation and transfer.
Rhabdomyolysis: muscle pain/weakness and dark urine after crush injury, seizure or extreme exercise. Renal-protective fluid and electrolyte monitoring are urgent.

12. Clinical scenarios

Scenario 1: Renal/GI risk and fracture pain

An older patient with CKD and previous ulcer has a painful hip fracture. Avoid uncritical NSAID use, support the limb, give protocol-based multimodal analgesia with careful opioid titration and monitor ventilation and BP.

Scenario 2: Septic arthritis versus gout

A hot swollen knee is accompanied by fever and confusion. Do not assume gout or inject steroid. Treat as possible sepsis, obtain urgent aspiration/antibiotic pathway and transfer.

Scenario 3: Compartment syndrome

After a leg fracture, pain is increasing despite opioids and the calf is tense. Reassess pulses, sensation and passive stretch, avoid tight casts/dressings and call for urgent surgical review.

Scenario 4: Colchicine toxicity

A patient with CKD takes extra colchicine and develops vomiting, diarrhoea and weakness. Stop further doses, arrange urgent toxicology/renal assessment and monitor ECG, blood count and organ function.

Scenario 5: Methotrexate dosing error

A patient has taken methotrexate daily instead of weekly and now has mouth ulcers and fever. Treat as a high-risk toxicity, isolate if infection is suspected, avoid further doses and transfer urgently.

Scenario 6: Rhabdomyolysis

After a crush injury, the patient has severe muscle pain and cola-coloured urine. Establish access, monitor ECG/potassium, begin authorised renal-protective fluid and transfer for laboratory and dialysis-capable care.

13. Administration, monitoring and handover

Document pain score and functional impact, injury mechanism, neurovascular status, renal/GI/cardiovascular history, pregnancy possibility, allergies, last analgesic/DMARD dose, medicine concentration, route, exact time, response and adverse effects. Handover red flags, immobilisation, serial circulation checks and need for orthopaedic/rheumatology/renal review.

14. Revision questions

Compare paracetamol, NSAIDs and opioids for acute musculoskeletal pain.
Why can NSAIDs cause AKI and GI bleeding?
What respiratory monitoring is needed after opioid analgesia?
List red flags for compartment syndrome.
Differentiate osteoarthritis and rheumatoid arthritis medicine goals.
Why is methotrexate dosing error dangerous?
What eye monitoring is required with hydroxychloroquine?
Compare acute gout flare treatment with long-term urate lowering.
Why can colchicine become toxic in renal disease?
What are the signs of septic arthritis?
Explain bisphosphonate and denosumab precautions.
What is the risk of abrupt denosumab discontinuation?
List symptoms of spinal cord or cauda equina compression.
How should a fracture with neurovascular compromise be managed?
What are the initial priorities in rhabdomyolysis?
Why should analgesia not be withheld while awaiting diagnosis?
Which patient factors alter NSAID choice?
How should a DMARD toxicity be documented and escalated?

15. Key takeaways

Analgesia is essential, but pain relief must be paired with examination, immobilisation, serial neurovascular checks and red-flag screening.
NSAIDs are effective but can cause GI bleeding, AKI, fluid retention and cardiovascular harm.
Opioids require ventilation monitoring, titration and naloxone/airway preparedness.
A hot swollen joint may be septic arthritis; a severe pain crisis may be compartment syndrome or spinal compression.
DMARDs and bone medicines require long-term laboratory, eye, renal, pregnancy and infection monitoring.
Gout flare therapy and urate-lowering prevention are different clinical decisions.

16. Recommended references for further study

Clinical note: This page supports EMT learning and revision. It does not replace an authorised prescription, local protocol, specialist supervision or patient-specific advice. In a deteriorating patient, stabilise ABCDE, call for advanced help and transfer urgently.