Swan-neck deformity — Bangla Clinical Note
1) Definition
Swan-neck deformity হলো আঙুলের এমন deformity যেখানে PIP joint hyperextension হয় এবং DIP joint flexion হয়। ফলে আঙুল দেখতে “S-shape” বা রাজহাঁসের গলার মতো লাগে। সাধারণত thumb-এ true swan-neck deformity হয় না, কারণ thumb-এ finger-এর মতো ৩টি phalangeal joint নেই।
2) Etiology / Causes — কারণ
Common causes
- Rheumatoid arthritis — সবচেয়ে common systemic cause
- RA synovitis → ligament/tendon attenuation → volar plate laxity → PIP hyperextension।
- Chronic inflammation terminal extensor tendon দুর্বল করে DIP flexion/mallet component তৈরি করতে পারে।
- Chronic mallet finger
- DIP extensor tendon injury untreated থাকলে DIP flexion থেকে compensatory PIP hyperextension হয়।
- Volar plate laxity / injury
- PIP joint-এর palmar support দুর্বল হলে joint backward hyperextend করে।
- Intrinsic muscle tightness
- Stroke, cerebral palsy, traumatic brain injury বা spasticity থাকলে intrinsic muscle tight হয়ে PIP hyperextension বাড়ায়।
- Flexor digitorum superficialis injury
- FDS দুর্বল বা injured হলে PIP joint-এর flexion control কমে যায়।
- Connective tissue laxity
- Hypermobility syndrome / Ehlers-Danlos type laxity থাকলে deformity হতে পারে।
StatPearls অনুযায়ী swan-neck deformity মূলত extensor mechanism imbalance, terminal tendon injury, RA/inflammatory process, intrinsic tightness এবং volar plate laxity থেকে তৈরি হয়।
3) Pathophysiology — সহজ core meaning
Main problem: আঙুলের tendon–ligament balance নষ্ট হয়।
- PIP joint: volar plate laxity বা intrinsic tightness → PIP joint অতিরিক্ত সোজা/পেছনে বেঁকে যায়।
- DIP joint: terminal extensor tendon দুর্বল/rupture → DIP joint নিচের দিকে flexed থাকে।
- RA case: chronic synovitis → tendon, ligament, joint capsule দুর্বল → deformity progressive হয়।
4) Clinical Features / Symptoms — লক্ষণ
- আঙুলের middle joint/PIP পিছনের দিকে hyperextend থাকে।
- আঙুলের tip joint/DIP সামনে flexed থাকে।
- আঙুলে S-shape deformity দেখা যায়।
- আঙুল ভাঁজ করতে সমস্যা।
- Grip, pinch, button লাগানো, লেখা, typing করতে difficulty।
- Finger stiffness, especially morning stiffness if RA.
- Pain, swelling, tenderness — inflammatory cause থাকলে বেশি।
- Finger movement-এর সময় snapping/clicking sensation হতে পারে।
- Long-standing হলে deformity fixed হয়ে যায়।
Cleveland Clinic ও StatPearls—উভয়েই finger-এর characteristic abnormal bending, stiffness, pain এবং hand use difficulty উল্লেখ করেছে।
5) Clinical Diagnosis — কীভাবে clinically diagnosis করবেন
Inspection
- Resting posture দেখবেন:
- PIP hyperextension
- DIP flexion
- MCP flexion বা RA hand deformity আছে কি না।
Palpation
- PIP/DIP tenderness, swelling, synovitis, warmth।
- Volar plate tenderness বা old trauma sign।
Movement assessment
- Active ROM এবং passive ROM।
- Deformity flexible না fixed—এটা treatment planning-এর জন্য important।
Finochietto–Bunnell test
- MCP extension অবস্থায় PIP passive flexion test।
- MCP flexion অবস্থায় আবার PIP passive flexion test।
- MCP flexion করলে PIP flexion improve করলে → intrinsic muscle tightness suggest করে।
- দুই position-এ একই limitation থাকলে → PIP capsular restriction suggest করে।
6) Investigations — specific
Local hand assessment
- X-ray hand/finger AP + lateral
- PIP/DIP arthritis, subluxation, fracture, mallet fracture, joint destruction।
- Ultrasound
- tendon rupture, synovitis, effusion, tenosynovitis।
- MRI
- complex tendon/ligament injury, occult soft tissue pathology—routine নয়।
If RA suspected
- CBC
- ESR, CRP
- Rheumatoid factor
- Anti-CCP antibody
- LFT, RFT — DMARD/NSAID start করার আগে
- Baseline viral screening if biologic/advanced DMARD planned
X-ray is commonly ordered to assess articular disruption, severe arthritis, and carpal collapse; RA testing is considered when inflammatory arthritis is suspected।
7) Differential Diagnosis
| Condition | Difference |
| Boutonniere deformity | PIP flexion + DIP hyperextension — Swan-neck-এর opposite |
| Mallet finger | Only DIP flexion, PIP initially normal |
| Trigger finger | Locking/catching বেশি, fixed S-shape নয় |
| PIP dislocation | Acute trauma, deformity with severe pain |
| Ulnar deviation in RA | MCP-level deviation, swan-neck pattern নয় |
| Dupuytren contracture | Palmar fascial contracture, usually flexion deformity |
Boutonniere deformity-এর pattern swan-neck-এর opposite—DIP hyperextension ও PIP flexion—এটি key differentiation।
8) Complications — রোগের জটিলতা
- Deformity progressive হয়ে fixed deformity হতে পারে।
- PIP joint stiffness।
- Grip strength কমে যায়।
- Pinch function কমে যায়।
- Chronic pain।
- RA থাকলে multiple finger deformity।
- Daily activity disability।
- Surgery-এর পর recurrence, incomplete correction, stiffness, DIP extension loss হতে পারে।
9) Management / Treatment — guideline-based
A) Important principle
Medicine deformity সোজা করে না। Medicine ব্যবহার হয়:
- pain কমাতে
- inflammation control করতে
- RA থাকলে disease progression slow করতে
- surgery/hand therapy-এর আগে function improve করতে
B) Non-pharmacological treatment
Early / flexible deformity
- Ring splint / silver ring splint
- PIP hyperextension block করে।
- PIP extension-block splint
- PIP joint excessive extension prevent করে।
- Hand therapy
- passive stretching, ROM exercise, tendon gliding।
- Activity modification
- forceful gripping, repeated finger hyperextension avoid।
- RA control
- rheumatology follow-up and DMARD.
Conservative treatment includes hand therapy, corrective splinting, extension-block splints, and progressive splinting; severe or chronic deformity usually needs surgery for true correction।
Surgical indications
- Fixed deformity
- Severe functional limitation
- PIP arthrosis
- Failed splint/therapy
- Chronic mallet with functional deformity
- RA joint destruction
Surgical options
- FDS tenodesis
- Volar plate reconstruction
- Lateral band relocation/tenodesis
- DIP fusion if chronic mallet component severe
- PIP arthrodesis/arthroplasty if joint destroyed
10) Pharmacological treatment — Bangladesh prescription-style drug list
Adult dose দেওয়া হলো। Patient-এর age, pregnancy, renal/liver disease, ulcer history, anticoagulant use, diabetes, hypertension অনুযায়ী dose/choice adjust করতে হবে।
1. Paracetamol
কেন used হয়: mild pain control; inflammation কমায় না, কিন্তু NSAID contraindicated হলে safer analgesic।
- Generic name: Paracetamol / Acetaminophen
- Therapeutic category: Analgesic, antipyretic
- Pharmacological class: Para-aminophenol derivative
- Dose: 500–1000 mg orally every 6–8 hours PRN
- Max dose: সাধারণত 3 g/day safer; selected adult-এ 4 g/day পর্যন্ত
- Duration: 3–5 days PRN
- Side effects: nausea, rash, hepatotoxicity overdose-এ
- Interaction: alcohol, warfarin prolonged use, enzyme inducer drugs
- Bangladesh brands: Ace 500 mg, G-Paracetamol 500 mg, Paragesic 500 mg; MedEx paracetamol brand listে এসব 500 mg tablet listed আছে।
2. Ibuprofen
কেন used হয়: pain + inflammation কমায়; acute painful finger inflammation/soft tissue pain-এ short course।
- Generic name: Ibuprofen
- Therapeutic category: NSAID
- Pharmacological class: Propionic acid derivative; non-selective COX inhibitor
- Dose: 400 mg orally 2–3 times daily after food
- Duration: 3–5 days; long-term avoid unless indicated
- Side effects: gastritis, peptic ulcer, GI bleeding, renal impairment, BP rise, bronchospasm in aspirin-sensitive asthma
- Interaction: anticoagulant, aspirin, steroid, ACEi/ARB + diuretic, lithium, methotrexate
- Bangladesh brands: Flamex 200/400 mg, Profen 400 mg, Inflam 400 mg, G-Ibuprofen 400 mg listed in MedEx।
3. Diclofenac
কেন used হয়: stronger anti-inflammatory analgesic; acute painful arthritis/tenosynovitis-type pain-এ doctors prescribe করেন।
- Generic name: Diclofenac sodium
- Therapeutic category: NSAID
- Pharmacological class: Acetic acid derivative; non-selective COX inhibitor
- Dose: 50 mg orally 2 times daily after food; severe painে 50 mg TDS short course
- Max dose: 150 mg/day
- Duration: 3–5 days; chronic use avoid
- Side effects: gastritis, GI bleed, renal injury, edema, BP rise, cardiovascular risk
- Interaction: anticoagulants, antiplatelets, steroid, ACEi/ARB, diuretics, lithium, methotrexate
- Bangladesh brands: Diclofen 50 mg, Diclorex 50 mg, Fengel 50 mg/gel 1%, G-Diclofenac 50 mg, Erdon gel/tablet listed in MedEx।
4. Naproxen
কেন used হয়: inflammatory pain control; relatively longer duration NSAID।
- Generic name: Naproxen sodium
- Therapeutic category: NSAID
- Pharmacological class: Propionic acid derivative; non-selective COX inhibitor
- Dose: 250–500 mg orally twice daily after food
- Duration: 5–7 days short course
- Side effects: dyspepsia, ulcer, GI bleeding, renal impairment, edema
- Interaction: anticoagulants, steroid, aspirin, ACEi/ARB + diuretic, lithium, methotrexate
- Bangladesh brands: Naproxen 500 mg, Naproxin 250/500 mg, Napryn 250/500 mg, Napsod 275/550 mg listed in MedEx।
5. Omeprazole / Pantoprazole
কেন used হয়: NSAID-induced gastritis/ulcer prevention or treatment, especially elderly, ulcer history, steroid/anticoagulant use।
- Generic name: Omeprazole / Pantoprazole
- Therapeutic category: Anti-ulcerant
- Pharmacological class: Proton pump inhibitor
- Dose:
- Omeprazole 20 mg once daily before breakfast
- Pantoprazole 20–40 mg once daily before breakfast
- Duration: NSAID course চলাকালীন; high-risk patientে longer as clinically indicated
- Side effects: headache, diarrhea/constipation, hypomagnesemia long-term, B12 deficiency long-term
- Interaction: clopidogrel with omeprazole caution, warfarin monitoring, methotrexate high-dose caution
- Bangladesh brands: Losectil 20/40 mg, Losek 20/40 mg, Pantobex 20/40 mg, Pantonix 20/40 mg, Pantogut 20/40 mg listed in MedEx।
RA-related drug treatment — যদি Swan-neck deformity RA-এর কারণে হয়
ACR 2021 RA guideline DMARD-based management address করে, এবং EULAR 2022 update-এ methotrexate ideally short-term glucocorticoid bridging সহ initial anchor drug হিসেবে recommended।
6. Methotrexate
কেন used হয়: RA disease activity কমায়, joint destruction slow করে, future deformity prevent করতে সাহায্য করে। Swan-neck deformity already fixed হলে সোজা করবে না, কিন্তু RA progression কমাতে key drug।
- Generic name: Methotrexate
- Therapeutic category: DMARD
- Pharmacological class: Antimetabolite; folate antagonist; conventional synthetic DMARD
- Dose: 7.5–15 mg orally once weekly, gradually increase up to 20–25 mg/week
- Duration: Long-term; response usually 6–12 weeks
- Must add: Folic acid
- Monitoring: CBC, ALT/AST, creatinine; hepatitis/TB assessment if advanced therapy planned
- Side effects: nausea, mouth ulcer, hepatotoxicity, bone marrow suppression, pneumonitis, teratogenicity
- Interaction: trimethoprim/co-trimoxazole avoid, alcohol, high-dose NSAID, penicillin, PPI caution, live vaccine caution
- Contraindication: pregnancy, breastfeeding, severe liver disease, severe renal disease, active infection
- Bangladesh brands: Meth 2.5 mg, Methotrax 2.5/10/15 mg, Methox 2.5 mg, Trexall 2.5/10 mg and injection listed in MedEx।
7. Folic acid
কেন used হয়: Methotrexate-এর mouth ulcer, GI upset, liver toxicity, marrow toxicity কমাতে।
- Generic name: Folic acid
- Therapeutic category: Vitamin supplement
- Pharmacological class: Water-soluble vitamin B9
- Dose: 5 mg once weekly, usually methotrexate-এর 24–48 hours পরে; alternative 1 mg daily except MTX day
- Duration: যতদিন MTX চলবে
- Side effects: rare rash, GI discomfort
- Interaction: high dose may reduce phenytoin level
- Bangladesh brands: Folac 5 mg, Folate 5 mg, Folcid 5 mg, Folic Acid 5 mg, Refolic 5 mg listed in MedEx।
8. Hydroxychloroquine
কেন used হয়: mild RA বা combination DMARD হিসেবে; inflammation control করে।
- Generic name: Hydroxychloroquine sulphate
- Therapeutic category: DMARD / antimalarial
- Pharmacological class: 4-aminoquinoline
- Dose: 200–400 mg/day orally; keep ≤5 mg/kg/day actual body weight
- Duration: Long-term; response 8–12 weeks
- Monitoring: baseline and periodic eye examination
- Side effects: nausea, skin pigmentation, retinopathy, QT prolongation rare, hypoglycemia rare
- Interaction: QT-prolonging drugs, digoxin, antidiabetic drugs
- Bangladesh brands: Avloquin-H 200 mg, Bioquin 200 mg, Corofree 200 mg, Coroquin 200 mg, HCQ 200 mg, Oxiquin 200/400 mg, Reconil 200 mg listed in MedEx।
9. Sulfasalazine
কেন used হয়: RA control, especially mild–moderate RA or combination DMARD therapy।
- Generic name: Sulfasalazine
- Therapeutic category: DMARD / anti-inflammatory
- Pharmacological class: 5-ASA + sulfonamide compound
- Dose: 500 mg daily initially, then 500 mg twice daily; gradually titrate to 1 g twice daily
- Duration: Long-term; response 6–12 weeks
- Monitoring: CBC, LFT
- Side effects: nausea, rash, headache, leukopenia, hepatotoxicity, orange urine, oligospermia reversible
- Interaction: warfarin, digoxin, folate antagonists; sulfa allergy caution
- Bangladesh brands: Salazine 500 mg, Sulfaben 500 mg, Sulfacol 500 mg, Zulfidin 500 mg listed in MedEx।
10. Prednisolone
কেন used হয়: RA flare বা severe inflammatory pain কমাতে short-term bridge therapy; long-term deformity prevention-এর main drug নয়।
- Generic name: Prednisolone
- Therapeutic category: Corticosteroid
- Pharmacological class: Glucocorticoid
- Dose: 5–10 mg once daily short course; severe flareে specialist may use higher dose
- Duration: 5–14 days; prolonged হলে taper প্রয়োজন
- Side effects: hyperglycemia, hypertension, gastritis, mood change, weight gain, infection risk, osteoporosis long-term
- Interaction: NSAID → GI bleed risk, antidiabetic drug dose adjustment, warfarin monitoring, live vaccine avoid high dose steroidে
- Bangladesh brands: Cortan 5/20 mg, Deltasone 5/10/20 mg, G-Prednisolone 5 mg, P-Cort 5 mg, Precodil 2/10 mg listed in MedEx।
Bangladesh doctors commonly prescribe — practical list
Mild pain without severe inflammation
- Paracetamol 500 mg PRN
- Hand splint + hand therapy
Pain with inflammation
- Ibuprofen 400 mg BD/TDS after food or
- Diclofenac 50 mg BD after food or
- Naproxen 500 mg BD after food
- Add PPI if gastritis/ulcer risk
RA suspected or confirmed
- Methotrexate weekly + Folic acid
- Hydroxychloroquine or Sulfasalazine depending disease severity
- Short course Prednisolone for flare
- Rheumatology referral
Fixed deformity / functional disability
- Hand surgeon referral
- Splint trial if flexible
- Surgical correction if severe/fixed
Prevention — কীভাবে প্রতিরোধ করবেন
- RA থাকলে early diagnosis and early DMARD start।
- Finger trauma বা mallet finger untreated রাখবেন না।
- Acute mallet finger হলে proper DIP splinting 6–8 weeks.
- Repeated finger hyperextension avoid।
- Hand therapy exercise regular.
- RA patientদের regular follow-up: disease activity, ESR/CRP, joint exam।
- Smoking stop — RA progression risk কমাতে সাহায্য করে।
- Self-medication NSAID/steroid long-term avoid।
- Pain কমে গেলেও deformity থাকলে splint/therapy বন্ধ করা যাবে না।
Overview / Summary
Swan-neck deformity হলো PIP hyperextension + DIP flexion deformity। Common cause হলো RA, chronic mallet finger, volar plate laxity, intrinsic tightness, tendon injury। Diagnosis mainly clinical, X-ray ও RA workup cause identify করতে সাহায্য করে। Early flexible deformity splint ও hand therapy দিয়ে manage করা যায়; fixed/severe deformity surgery লাগতে পারে। Medicine deformity সোজা করে না—pain/inflammation control এবং RA progression prevent করার জন্য ব্যবহৃত হয়।
Actionable Plan / Steps
- Finger posture দেখে confirm করুন: PIP hyperextension + DIP flexion।
- Flexible না fixed—passive ROM দিয়ে assess করুন।
- X-ray finger/hand করুন।
- RA symptoms থাকলে RF, anti-CCP, ESR, CRP, CBC, LFT, RFT করুন।
- Early flexible deformity হলে ring splint/extension-block splint + hand therapy শুরু করুন।
- Pain হলে short course analgesic/NSAID consider করুন; ulcer/renal/CV risk check করুন।
- RA confirmed হলে rheumatologist-এর অধীনে MTX-based DMARD therapy শুরু করুন।
- Severe fixed deformity বা functional disability হলে hand surgeon referral দিন।
Reference List
Textbooks
- Green’s Operative Hand Surgery, 8th ed. Chapter: Rheumatoid Hand and Finger Deformities.
- Campbell’s Operative Orthopaedics, 14th ed. Section: Hand deformities and rheumatoid hand.
- Kelley and Firestein’s Textbook of Rheumatology, 11th ed. Chapter: Rheumatoid arthritis—clinical features and management.
- Apley & Solomon’s System of Orthopaedics and Trauma, latest ed. Hand deformities and inflammatory arthropathy sections.
- Harrison’s Principles of Internal Medicine, 21st ed. Rheumatoid arthritis chapter.
Guidelines
- American College of Rheumatology. 2021 Guideline for the Treatment of Rheumatoid Arthritis. Arthritis Rheumatol. 2021;73(7):1108–1123. DOI: 10.1002/art.41752.
- EULAR. Recommendations for the management of rheumatoid arthritis with synthetic and biological DMARDs: 2022 update. Ann Rheum Dis. DOI: 10.1136/ard-2022-223356.
- NICE NG100. Rheumatoid arthritis in adults: management. Updated guidance.
Peer-reviewed journals / DOI
- McKeon KE, Lee DH. Posttraumatic Boutonnière and Swan Neck Deformities. J Am Acad Orthop Surg. 2015;23(10):623–632. DOI: 10.5435/JAAOS-D-14-00272.
- Fox PM, Chang J. Treating the Proximal Interphalangeal Joint in Swan Neck and Boutonniere Deformities. Hand Clin. 2018;34(2):167–176. DOI: 10.1016/j.hcl.2017.12.006.
- Johnsson PM, Eberhardt K. Hand deformities are important signs of disease severity in patients with early rheumatoid arthritis. Rheumatology. 2009;48(11):1398–1401. DOI: 10.1093/rheumatology/kep253.
- Vishwanathan K, Ganjiwale D. A novel surgical correction and innovative splint for swan neck deformity in hypermobility syndrome. J Family Med Prim Care. 2018;7(1):242–245. DOI: 10.4103/jfmpc.jfmpc_14_17.
Md.Rafiqul Islam Lipu,Date:-23-06-2026 Tuesday,Time:-11-47-12 Am