NLE Musculoskeletal Nursing — Degenerative, Inflammatory and Metabolic Bone DisordersRevision Notes

Exam Tips

• The NLE commonly gives a scenario and asks you to identify OA vs. RA. Focus on: symmetry, stiffness duration, systemic signs, and finger nodes.
• If the stem mentions 'bilateral,' 'morning stiffness more than 1 hour,' or 'fever and fatigue' — think RA.
• If the stem mentions 'asymmetric,' 'knee or hip pain worse with activity,' 'Heberden's nodes,' or 'no systemic signs' — think OA.
• For RA drug questions: Methotrexate → always pair with folic acid, monitor CBC and LFTs, and warn about teratogenicity.
• For OA drug questions: Acetaminophen first; if NSAIDs are added, monitor for GI irritation — advise taking with food.
• Remember: Cold for ACUTE inflammation (reduces swelling, numbs pain); Heat for STIFFNESS and chronic ache (promotes muscle relaxation and circulation).

Key Points

• Osteoarthritis (OA) is a DEGENERATIVE, non-inflammatory 'wear-and-tear' disease — think of it as articular cartilage simply breaking down over time due to aging, obesity, or repetitive use.
• Rheumatoid Arthritis (RA) is a SYSTEMIC, AUTOIMMUNE, INFLAMMATORY disease — the body's immune system attacks the synovial membrane, forming a destructive tissue called PANNUS that erodes cartilage and bone.
• OA is typically ASYMMETRIC and affects LARGE WEIGHT-BEARING JOINTS (knees, hips, spine) and the distal finger joints (DIP joints).
• RA is classically SYMMETRIC (bilateral) and affects SMALL JOINTS FIRST — hands, wrists, and feet — then progresses.
• MORNING STIFFNESS is a key differentiator: OA = LESS THAN 30 MINUTES; RA = MORE THAN 1 HOUR.
• OA hallmark nodes: HEBERDEN'S NODES at DIP joints; BOUCHARD'S NODES at PIP joints — these are bony, hard, non-tender outgrowths.
• RA hallmark: PANNUS formation; ULNAR DEVIATION and SWAN-NECK DEFORMITIES of the fingers; positive RHEUMATOID FACTOR (RF) and ANTI-CCP antibodies.
• OA has NO SYSTEMIC SYMPTOMS. RA has SYSTEMIC features: low-grade fever, fatigue, weight loss, malaise, and anemia of chronic disease.
• OA labs are typically NORMAL. RA shows elevated ESR, elevated CRP, positive RF, positive anti-CCP.
• OA first-line pharmacologic treatment: ACETAMINOPHEN (paracetamol). NSAIDs are added as needed.
• RA anchor DMARD (Disease-Modifying Antirheumatic Drug): METHOTREXATE. Always co-prescribe FOLIC ACID to reduce side effects. Monitor for hepatotoxicity and bone marrow suppression. METHOTREXATE IS TERATOGENIC — counsel patients of childbearing age.
• For RA, biologic agents (e.g., etanercept — a TNF inhibitor) increase INFECTION RISK — screen for TB before starting biologics.
• Nursing management for both: joint protection, heat application for stiffness, cold application for acute inflammation, weight reduction, low-impact exercise (e.g., swimming), and energy conservation techniques.

Definitions

Section Title

Osteoarthritis (OA) vs. Rheumatoid Arthritis (RA) — The Critical Comparison

Common Mistakes

• Confusing morning stiffness duration: OA under 30 minutes, RA over 1 hour. Many students reverse this — remember 'RA = Really A long time (>1 hour).'
• Thinking Heberden's and Bouchard's nodes occur in RA — they are findings in OA only. RA causes soft tissue swelling (boggy joints), not hard bony nodes.
• Forgetting that OA is asymmetric and RA is symmetric — this distinction drives many NLE distractors.
• Not knowing that acetaminophen is the first-line for OA, not NSAIDs — NSAIDs carry GI and renal risks especially in elderly Filipino patients.
• Failing to mention folic acid supplementation when methotrexate is given for RA — this is a critical nursing responsibility.
• Forgetting that methotrexate is teratogenic and requires strict contraceptive counseling.
• Confusing the joints involved: RA starts with SMALL joints (metacarpophalangeal, wrist); OA starts with LARGE weight-bearing joints (knee, hip).

Exam Tips

• NLE scenario clue: 'sudden, severe pain in the great toe at night, red, hot, swollen' = GOUT. Answer: elevate the limb, apply cold, and give colchicine.
• Diet question: 'Which food should be AVOIDED?' → organ meats (atay), shellfish, sardines, beer. 'Which food is ALLOWED?' → eggs, milk, most fruits, bread.
• Drug priority question: 'Acute attack' → Colchicine/NSAIDs. 'Long-term prevention' → Allopurinol.
• Remember the nursing action during acute attack: Bed cradle → protects the sensitive joint from bed linen pressure.
• Allopurinol rash warning: A diffuse skin rash during allopurinol therapy may indicate a rare but serious hypersensitivity reaction — withhold drug and notify physician.

Key Points

• Gout is a metabolic disorder of PURINE METABOLISM resulting in HYPERURICEMIA (elevated uric acid in blood), leading to deposition of MONOSODIUM URATE CRYSTALS in joints and surrounding tissues.
• The CLASSIC first presentation is PODAGRA — acute, sudden onset of severe pain, redness, warmth, and swelling of the GREAT TOE (first metatarsophalangeal joint).
• Attacks come on SUDDENLY, often at night, and the joint becomes exquisitely tender — even the weight of bed sheets causes pain.
• Chronic gout leads to TOPHI — visible deposits of urate crystals under the skin, typically on the ears, fingers, elbows, and around joints.
• Hyperuricemia can also cause URATE KIDNEY STONES (nephrolithiasis) — hence the importance of high fluid intake.
• ACUTE ATTACK MANAGEMENT: Colchicine (first-line) + NSAIDs (e.g., indomethacin, naproxen). Corticosteroids are used when colchicine and NSAIDs are contraindicated.
• COLCHICINE TOXICITY signs: Nausea, vomiting, diarrhea — these indicate the drug is reaching toxic levels; notify the physician.
• LONG-TERM PREVENTION: ALLOPURINOL (xanthine oxidase inhibitor) — reduces uric acid PRODUCTION. Do NOT start allopurinol during an acute gout attack because it can WORSEN the attack by mobilizing urate crystals.
• PROBENECID — promotes uric acid EXCRETION by the kidneys (uricosuric agent). Encourage high fluid intake with probenecid use.
• ASPIRIN is CONTRAINDICATED in gout — it raises uric acid levels by reducing renal uric acid excretion.
• DIETARY TEACHING (critical NLE content): Avoid HIGH-PURINE FOODS: organ meats (atay, bato ng baboy/baka), red meat (beef, pork), shellfish (hipon, talaba, alimango), sardines, anchovies, mackerel. Avoid alcohol especially BEER (highest in purines). INCREASE FLUID INTAKE to 2-3 liters per day.
• LOW-PURINE FOODS allowed: most vegetables, eggs, cheese, bread, most fruits, milk. Vegetables like spinach and asparagus are moderate in purines but generally tolerated.
• Nursing interventions during acute attack: Rest, ELEVATE and IMMOBILIZE the affected joint, protect from pressure (use a bed cradle over the feet), apply COLD packs for pain relief.
• Weight reduction and avoidance of CRASH DIETING (which raises uric acid) are part of long-term management.

Definitions

Section Title

Gout — Metabolic Arthritis and Dietary Management

Common Mistakes

• Starting allopurinol DURING an acute attack — this is wrong and can worsen the flare. Allopurinol is for PREVENTION, not acute treatment.
• Recommending aspirin for gout pain — aspirin raises uric acid and is contraindicated in gout.
• Forgetting to teach the patient to PUSH FLUIDS (2-3 liters/day) — essential to prevent kidney stone formation.
• Allowing crash dieting — rapid weight loss INCREASES uric acid levels and can precipitate a gout attack.
• Not recognizing colchicine toxicity signs (GI symptoms) — students sometimes think diarrhea is a normal expected effect rather than a toxicity warning.
• Thinking all vegetables are restricted — most vegetables are low in purines and are actually encouraged in a gout diet.

Exam Tips

• DEXA T-score: memorize the three levels — Normal (>-1.0), Osteopenia (-1.0 to -2.5), Osteoporosis (≤-2.5).
• Bisphosphonate question: The correct instruction is 'take in the morning on an empty stomach with a full glass of water and stay upright for 30 minutes.'
• The NLE often asks about PRIORITY NURSING DIAGNOSIS in osteoporosis: 'Risk for Injury (fracture) related to decreased bone density' — this aligns with Maslow's physiologic safety needs.
• Filipino dietary context: Remind students that dilis and other small fish eaten with bones, malunggay, and fortified milk are good local calcium sources to include in patient teaching.
• If a question asks 'What exercise is BEST for osteoporosis?' → Choose WALKING over swimming or cycling.

Key Points

• Osteoporosis is a METABOLIC BONE DISEASE in which bone RESORPTION exceeds bone FORMATION, resulting in LOW BONE MASS and MICROARCHITECTURAL DETERIORATION — bones become porous, brittle, and prone to fracture.
• Often called the 'SILENT DISEASE' because there are NO SYMPTOMS until a FRACTURE OCCURS.
• Classic fracture sites: HIP (most deadly — high mortality in elderly), VERTEBRAL (compression fractures → loss of height, KYPHOSIS / 'Dowager's Hump'), and WRIST (Colles' fracture).
• KEY RISK FACTORS: Postmenopausal estrogen deficiency, advanced age, female sex, small thin frame, low calcium and vitamin D intake, sedentary lifestyle, smoking, excessive alcohol, long-term CORTICOSTEROID use (e.g., patients on prednisone for RA or asthma), and family history.
• DIAGNOSIS: DEXA Scan (Dual-Energy X-ray Absorptiometry). T-score interpretation: Normal = T-score above -1.0; Osteopenia = T-score -1.0 to -2.5; OSTEOPOROSIS = T-score AT OR BELOW -2.5.
• CALCIUM requirement: approximately 1000-1200 mg/day. Filipino dietary sources: milk, dilis (small dried fish eaten with bones), kangkong, malunggay, tofu, dairy products.
• VITAMIN D requirement: approximately 800-1000 IU/day. Sources: sunlight exposure, fortified milk, fatty fish, egg yolks.
• WEIGHT-BEARING EXERCISE: Walking, dancing, jogging — these activities stimulate osteoblast (bone-forming cell) activity and maintain bone density. Swimming and cycling are NOT weight-bearing.
• BISPHOSPHONATES (e.g., Alendronate/Fosamax, Risedronate/Actonel): These drugs INHIBIT OSTEOCLASTIC BONE RESORPTION — they slow down bone breakdown.
• CRITICAL BISPHOSPHONATE TEACHING (HIGH NLE YIELD): Take on an EMPTY STOMACH in the MORNING with a FULL GLASS (6-8 oz / ~200 mL) of PLAIN WATER only. REMAIN UPRIGHT (sitting or standing) for AT LEAST 30 MINUTES after taking — this prevents esophagitis and esophageal erosion/ulceration (osteonecrosis of the jaw is a rare but serious long-term complication).
• FALL PREVENTION is a TOP NURSING PRIORITY because fractures are the main danger. Interventions: remove loose rugs and clutter, ensure good lighting in the home, install grab bars in the bathroom, encourage use of non-slip footwear, and use assistive devices (cane, walker).
• Hormone Replacement Therapy (HRT) may be considered for postmenopausal women but carries risks (breast cancer, DVT); requires thorough patient education.
• Raloxifene (SERM — Selective Estrogen Receptor Modulator) is an alternative to HRT that helps maintain bone density without stimulating breast or uterine tissue.

Definitions

Section Title

Osteoporosis — Silent Bone Thinner

Common Mistakes

• Thinking swimming or cycling prevents osteoporosis — these are NOT weight-bearing exercises. Only activities where you bear your body weight against gravity (walking, jogging, dancing) stimulate bone formation.
• Forgetting the bisphosphonate teaching points — especially the 'remain upright for 30 minutes' rule. Students sometimes say 'take with food' which is WRONG for bisphosphonates (must be empty stomach).
• Confusing T-score values: -2.5 or LOWER (e.g., -3.0) = Osteoporosis; -1.0 to -2.5 = Osteopenia.
• Not including fall prevention as a nursing priority — with osteoporosis, fracture prevention is as important as bone-building.
• Forgetting that long-term corticosteroid use is a major risk factor for osteoporosis — this is a frequently tested link in NLE questions involving patients with RA or asthma on steroids.

Exam Tips

• Causative organism question: Answer is STAPHYLOCOCCUS AUREUS unless the question specifies a specific population (e.g., sickle cell anemia → Salmonella; neonates → Group B Streptococcus; IV drug users → Pseudomonas).
• Priority nursing diagnosis: 'Acute Pain related to bone infection and inflammation' or 'Risk for Injury (pathologic fracture) related to bone destruction.'
• Aseptic technique is emphasized — osteomyelitis wound care requires sterile/aseptic technique to prevent superinfection.
• For NLE questions on treatment duration — 'prolonged IV antibiotics (4-6 weeks)' is the expected answer.
• Home care teaching priority: Complete the full antibiotic course and care for the PICC line properly.

Key Points

• Osteomyelitis is an INFECTION OF THE BONE — can be acute or chronic.
• MOST COMMON CAUSATIVE ORGANISM: STAPHYLOCOCCUS AUREUS (gram-positive cocci in clusters) — this is the #1 tested answer.
• ROUTES OF INFECTION: (1) Hematogenous (bloodstream spread — most common in children); (2) Contiguous spread (from adjacent infected tissue — e.g., diabetic foot ulcer spreading to bone); (3) Direct inoculation (open fracture, surgical wound, orthopedic implant).
• CLINICAL MANIFESTATIONS: Localized bone pain (deep, constant, throbbing), tenderness over the bone, fever (can be high), chills, malaise, local swelling, erythema (redness), warmth, and if a sinus tract forms, purulent drainage from the skin over the bone.
• LABORATORY FINDINGS: Elevated WBC (leukocytosis), elevated ESR, elevated CRP, positive blood cultures (in hematogenous type).
• IMAGING: X-ray (may be normal early), MRI (most sensitive), bone scan (technetium-99m).
• MANAGEMENT: PROLONGED IV ANTIBIOTICS — typically 4 to 6 weeks or longer. Often the patient is discharged to complete the course at home through a PICC line or other central venous access.
• SURGICAL INTERVENTION: Debridement (removal of infected and necrotic tissue). SEQUESTRUM = dead piece of bone surrounded by infection. INVOLUCRUM = new bone formed around the sequestrum. Surgical removal of sequestrum may be necessary.
• NURSING CARE: Strict ASEPTIC TECHNIQUE for wound care (infection control), immobilize and elevate the affected limb to reduce pain and edema, manage pain, maintain and monitor IV/central line access, assess neurovascular status of the affected limb, support NUTRITION (high protein + vitamin C to promote wound healing), monitor for signs of antibiotic toxicity.
• HANDLE THE AFFECTED LIMB GENTLY — the bone is weakened and susceptible to PATHOLOGIC FRACTURE.
• PATIENT TEACHING: Stress the importance of completing the FULL COURSE of IV antibiotics even when symptoms improve. Educate about care of PICC line at home, signs of infection at the IV site, and when to seek emergency care.
• Psychosocial support is important because osteomyelitis treatment is prolonged, disrupting school, work, and family life — particularly relevant in the Filipino family-centered healthcare context.

Definitions

Section Title

Osteomyelitis — Bone Infection

Common Mistakes

• Forgetting that S. aureus is the most common cause — students sometimes guess E. coli or Streptococcus.
• Not recognizing the risk of pathologic fracture — students forget to instruct caregivers to handle the limb gently.
• Underestimating the duration of treatment — 4-6 weeks of IV antibiotics is standard; shorter courses lead to relapse and chronic osteomyelitis.
• Not connecting nutrition to healing — high-protein and vitamin C-rich diet supports tissue repair and immune function.
• Forgetting psychosocial needs — prolonged hospitalization or home IV therapy significantly impacts the patient's and family's quality of life.

Exam Tips

• The NLE often presents a scenario where the nurse must recognize a violation of hip precautions — watch for choices like 'cross the legs for comfort,' which is WRONG.
• If asked 'What should the nurse include in discharge teaching after THR?' — include all three precautions, raised toilet seat, abduction pillow use, and signs of dislocation to report.
• Priority nursing intervention post-THR for DVT prevention: Early ambulation on postoperative day 1 (with PT assistance) combined with anticoagulation and SCDs.
• Dislocation = EMERGENCY. Correct nursing action: Keep patient still, do NOT attempt to reposition the leg, notify physician immediately.
• Neurovascular checks post-THR: Should be done every 1-2 hours in the immediate postoperative period.

Key Points

• Total Hip Replacement (THR) or Total Hip Arthroplasty (THA) is performed to relieve pain and restore function in end-stage osteoarthritis or rheumatoid arthritis of the hip.
• The greatest risk postoperatively is PROSTHESIS DISLOCATION — this is why HIP PRECAUTIONS are strictly enforced.
• THE THREE HIP PRECAUTIONS (memorize all three): (1) NO HIP FLEXION BEYOND 90 DEGREES, (2) NO ADDUCTION PAST THE MIDLINE (no crossing the legs), (3) NO INTERNAL ROTATION of the operated hip.
• PRACTICAL APPLICATIONS OF HIP PRECAUTIONS: (1) No flexion >90°: Use RAISED TOILET SEAT, avoid low chairs, do not bend forward to reach the feet, do not reach the floor. (2) No adduction: Use ABDUCTION PILLOW between the legs (especially when in bed), NEVER cross the legs. (3) No internal rotation: Keep toes pointing UPWARD/FORWARD when supine.
• TURNING IN BED: Turn ONLY onto the UNAFFECTED SIDE with a PILLOW BETWEEN THE LEGS — this maintains abduction and prevents adduction and internal rotation.
• SIGNS OF DISLOCATION (REPORT IMMEDIATELY): Sudden, severe hip pain; leg appears SHORTENED and EXTERNALLY ROTATED (or internally rotated depending on prosthesis type); inability to bear weight; loss of previously achieved range of motion. ALWAYS report these to the physician immediately.
• DVT/PE PREVENTION: Anticoagulant therapy (e.g., enoxaparin/Clexane, warfarin, or newer oral anticoagulants like rivaroxaban), Sequential Compression Devices (SCDs) on the legs, early AMBULATION (usually first postoperative day with PT assistance), ankle pumping exercises.
• WOUND CARE: Monitor for signs of infection (redness, warmth, purulent drainage, fever), monitor Jackson-Pratt or Hemovac drains for output (color, amount, character), and notify the physician if drainage is excessive.
• PAIN MANAGEMENT: Adequate analgesia is essential for early ambulation. Use the Numeric Rating Scale (NRS) or Visual Analog Scale (VAS) to assess pain regularly.
• For TOTAL KNEE REPLACEMENT (TKR): Continuous Passive Motion (CPM) machine may be used to maintain range of motion and prevent stiffness. Elevate the leg to reduce swelling.
• Neurovascular checks are essential after any joint replacement — assess the 5 Ps: Pain, Pallor, Pulselessness, Paresthesia, Paralysis (Poikilothermia is sometimes added for compartment syndrome).

Definitions

Section Title

Total Hip Replacement (THR) and Hip Precautions

Common Mistakes

• Forgetting all THREE hip precautions — students often remember 'no flexion >90°' but forget 'no adduction' and 'no internal rotation.'
• Not specifying the correct turning position — post-THR patients should turn only onto the UNAFFECTED side with a pillow between the legs.
• Missing the signs of dislocation — a shortened, rotated leg with sudden severe pain is a nursing emergency.
• Forgetting the raised toilet seat — this is a practical application of the 'no flexion >90°' precaution that is commonly tested.
• Confusing CPM machine (for TKR) with THR management — CPM is for KNEE replacement, not hip replacement.
• Neglecting DVT prevention — anticoagulants, SCDs, and early ambulation are all part of the answer for post-THR care questions.

Exam Tips

• Red flag scenario: 'Patient with back pain suddenly develops urinary incontinence and numbness in the perineum' → CAUDA EQUINA SYNDROME → EMERGENCY. Correct action: Notify surgeon IMMEDIATELY for urgent decompression.
• Body mechanics question: The answer to 'How should a patient lift objects?' is always 'Bend the knees, keep back straight, hold object close to body, avoid twisting.'
• Post-laminectomy care: Priority assessments are neurologic status, wound drainage (especially for clear CSF), and pain management.
• Log-rolling question: 'How many nurses are needed?' → Usually 2-3 nurses for safe log-rolling. One supports the head/neck, one the torso, one the legs.
• If asked about the priority nursing action when a clear drainage appears on a post-laminectomy dressing: Test the fluid (halo/ring sign for glucose if CSF suspected) and notify the surgeon immediately.

Key Points

• Low Back Pain (LBP) is one of the MOST COMMON musculoskeletal complaints in the Philippines and worldwide — a leading cause of disability and work absenteeism.
• Most acute LBP is MECHANICAL in origin: muscle strain, ligamentous injury, or degenerative disc disease. It is usually SELF-LIMITING and resolves with conservative management.
• HERNIATED INTERVERTEBRAL DISC (HNP — Herniated Nucleus Pulposus): The soft inner core (nucleus pulposus) of a disc protrudes through the tough outer ring (annulus fibrosus) and compresses adjacent nerve roots.
• SCIATICA: Radiating pain along the sciatic nerve distribution (from the lower back, through the buttock, down the leg to the foot) — caused by nerve root compression, often at L4-L5 or L5-S1 levels.
• CLINICAL SIGNS: Back pain, sciatica, numbness, tingling, and weakness in the leg. Positive STRAIGHT LEG RAISE TEST (Lasegue's sign) suggests nerve root involvement.
• CONSERVATIVE MANAGEMENT (first-line for most LBP): SHORT PERIOD of modified activity (prolonged bed rest is DISCOURAGED — bed rest longer than 2 days does not help and leads to deconditioning), NSAIDs for pain and inflammation, muscle relaxants (e.g., cyclobenzaprine), and heat or cold therapy.
• BODY MECHANICS TEACHING (HIGH NLE YIELD): Bend at the KNEES, not the waist (squat lift). Keep objects CLOSE TO THE BODY when lifting. AVOID TWISTING while lifting. MAINTAIN GOOD POSTURE. Sleep on a FIRM MATTRESS in a position that reduces back strain (e.g., side-lying with a pillow between knees). Strengthen CORE (abdominal and back) muscles. Maintain a healthy body weight.
• RED FLAG SYMPTOMS (REQUIRES URGENT/EMERGENCY EVALUATION): New onset of BOWEL OR BLADDER INCONTINENCE or retention, SADDLE ANESTHESIA (numbness in the perineum, inner thighs, and buttocks — the area that would contact a saddle), progressive LOWER EXTREMITY WEAKNESS — these suggest CAUDA EQUINA SYNDROME, a SURGICAL EMERGENCY.
• CAUDA EQUINA SYNDROME: Compression of the cauda equina nerve roots at the lower end of the spinal cord. If not decompressed urgently, permanent paralysis and incontinence can result.
• SURGICAL OPTIONS: DISCECTOMY (removal of the herniated disc material), LAMINECTOMY (removal of part of the vertebral lamina to decompress the nerve). These are done when conservative treatment fails after 6-12 weeks.
• POST-SPINAL SURGERY NURSING CARE: LOG-ROLLING TECHNIQUE when turning the patient — to maintain spinal alignment and prevent injury. Assess the surgical dressing for CLEAR DRAINAGE (may indicate cerebrospinal fluid [CSF] leak — report immediately). Monitor for new or worsening NEUROLOGIC DEFICITS (weakness, numbness, incontinence). Manage pain. Early, cautious ambulation as ordered by the surgeon.
• CSF LEAK identification: Test drainage on a dressing — CSF will create a 'halo' or 'ring' sign (clear fluid surrounding a bloody center on the gauze).

Definitions

Section Title

Low Back Pain and Spinal Disorders

Common Mistakes

• Recommending PROLONGED BED REST for LBP — current evidence shows prolonged bed rest is harmful. Short-term activity modification followed by gradual return to activity is correct.
• Missing red flag symptoms of cauda equina syndrome — students may not prioritize bowel/bladder dysfunction in a back pain scenario. This is an emergency.
• Teaching incorrect lifting technique — 'bend at the waist' is WRONG. 'Bend at the knees, keep the back straight' is correct.
• Not checking for CSF leak after spinal surgery — clear fluid on the dressing after laminectomy/discectomy must be reported.
• Forgetting log-rolling — turning a post-spinal surgery patient without log-rolling can cause serious spinal injury.