Baker’s cyst / Popliteal cyst — সংজ্ঞা
Baker’s cyst হলো হাঁটুর পিছনের অংশে, অর্থাৎ popliteal fossa-তে synovial fluid জমে তৈরি হওয়া fluid-filled swelling। সাধারণত এটি semimembranosus tendon ও medial head of gastrocnemius muscle–এর মাঝের bursa ফুলে যাওয়ার কারণে হয়। প্রাপ্তবয়স্কদের ক্ষেত্রে এটি বেশিরভাগ সময় underlying knee pathology—যেমন osteoarthritis, meniscal tear, rheumatoid arthritis—এর সঙ্গে যুক্ত থাকে।
Cause / Etiology — কারণগুলো
- Osteoarthritis of knee
হাঁটুর cartilage ক্ষয় হলে joint irritation হয়, synovial fluid বেশি তৈরি হয়, সেই fluid posteriorly cyst তৈরি করতে পারে। - Meniscal tear / cartilage injury
বিশেষ করে medial meniscus tear হলে joint effusion বাড়ে এবং Baker’s cyst হতে পারে। - Rheumatoid arthritis / inflammatory arthritis
Synovitis থাকলে synovial fluid production বেড়ে যায়। - Knee trauma / sports injury
Ligament injury, cartilage injury, repetitive stress—এসব cyst formation trigger করতে পারে। - Gout / crystal arthropathy
Acute synovitis হলে fluid বাড়ে। - Children-এ
অনেক সময় idiopathic; সবসময় arthritis বা meniscal tear থাকে না।
Core pathophysiology: knee joint–এ excess synovial fluid তৈরি হয় → one-way valve effect দিয়ে fluid posterior bursa-তে ঢোকে → cyst বড় হয় → pain/tightness/rupture হতে পারে।
Symptoms — লক্ষণগুলো
- হাঁটুর পিছনে lump / swelling
Popliteal fossa-তে নরম বা টানটান ফুলা দেখা যায়। - Tightness / pressure sensation
রোগী বলে “হাঁটুর পিছনে টান লাগছে”। - Pain behind knee
হাঁটু পুরো সোজা করলে বা হাঁটা/সিঁড়ি ওঠানামায় ব্যথা বাড়তে পারে। - Knee stiffness
Flexion-extension কমে যায়; হাঁটু ভাঁজ করতে অসুবিধা হয়। - Swelling fluctuation
Cyst কখনো বড়, কখনো ছোট হতে পারে। - Underlying disease-এর symptoms
OA হলে crepitus, joint-line pain; RA হলে morning stiffness, multiple joint pain; meniscal tear হলে locking/catching থাকতে পারে। - Ruptured Baker’s cyst হলে
হঠাৎ calf pain, calf swelling, redness, warmth—DVT-এর মতো presentation হতে পারে; এটাকে pseudothrombophlebitis বলা হয়। এই অবস্থায় urgent Doppler দরকার।
Clinical Diagnosis — clinically কীভাবে diagnose করবেন
History
- Pain location: posterior knee?
- Duration: acute নাকি chronic?
- Swelling increases with activity?
- OA/RA/gout/trauma history?
- Calf swelling বা sudden pain আছে কি না?
- Fever, hot swollen joint, weight loss, night pain আছে কি না—red flag।
Physical examination
- Inspection: popliteal fossa swelling, knee effusion।
- Palpation: cystic, fluctuant, mildly tender swelling।
- Foucher’s sign: knee extension-এ cyst বেশি tense; knee flexion করলে softer/less prominent হয়।
- Range of motion: flexion/extension limitation।
- Knee pathology exam: joint-line tenderness, McMurray test, crepitus, ligament stability।
- Neurovascular exam: distal pulse, sensation, calf tenderness।
- DVT exclusion signs: calf circumference difference, pitting edema, calf tenderness; suspicion থাকলে clinical exam alone যথেষ্ট নয়।
Specific Investigations
- Ultrasound of popliteal fossa
First practical test। Cystic vs solid mass বোঝা যায়, aspiration guide করা যায়। Red flag না থাকলে clinically suspected Baker’s cyst-এ ultrasound সবসময় management বদলায় না, কিন্তু uncertain case-এ useful। - Venous Doppler ultrasound
Sudden calf pain/swelling/redness থাকলে DVT rule out করতে হবে। - X-ray knee — weight-bearing AP, lateral, skyline/Merchant view
Cyst directly দেখা যায় না, কিন্তু OA, joint-space narrowing, osteophyte, chondrocalcinosis দেখা যায়। - MRI knee
Best soft-tissue imaging; meniscal tear, cartilage defect, tumor, atypical cyst, recurrent cyst, pre-operative planning—এসব ক্ষেত্রে সবচেয়ে useful। Frush & Noyes review অনুযায়ী MRI Baker’s cyst diagnosis ও differential exclusion-এ gold-standard imaging হিসেবে বিবেচিত। - Blood tests — routine নয়, indication অনুযায়ী
CBC, ESR/CRP যদি infection/inflammatory arthritis suspect হয়; RF/anti-CCP যদি RA suspect হয়; serum uric acid/crystal analysis যদি gout suspect হয়। - Aspiration fluid analysis — selected cases
Septic arthritis, crystal arthritis, hemorrhagic cyst suspect হলে: cell count, Gram stain, culture, crystals।
Differential Diagnosis
- Deep vein thrombosis — DVT
- Popliteal artery aneurysm
- Soft tissue tumor / sarcoma
- Ganglion cyst
- Meniscal cyst
- Abscess
- Hematoma
- Lipoma
- Varicose vein / venous swelling
- Calf muscle tear
Complications — সহজ বাংলায়
- Rupture: cyst ফেটে গেলে fluid calf muscle plane-এ নেমে যায় → calf ফুলে যায়, ব্যথা হয়, লাল-গরম হতে পারে; DVT-এর মতো লাগে।
- DVT mimic / diagnostic confusion: rupture এবং DVT clinically similar, তাই Doppler জরুরি।
- Neurovascular compression: বড় cyst nerve/vein চাপ দিলে numbness, tingling, leg swelling হতে পারে।
- Recurrent cyst: underlying OA/meniscal tear/RA treat না করলে বারবার ফিরে আসে।
- Reduced knee movement: হাঁটু ভাঁজ-সোজা করতে কষ্ট, functional limitation।
- Infection / hemorrhage — rare: particularly immunosuppressed, anticoagulated বা intervention-এর পরে।
- Compartment syndrome — very rare but serious: severe calf pain, tense calf, neurovascular compromise হলে emergency।
Treatment / Management
Core principle
Baker’s cyst-এর primary treatment হলো underlying knee disease treat করা। শুধু cyst drain করলে recurrence হতে পারে। Most cases nonsurgical management দিয়ে ভালো হয়; surgery rarely needed. AAOS অনুযায়ী initial treatment সাধারণত nonsurgical—activity modification, NSAID, steroid injection, aspiration; surgery repeated recurrence বা refractory painful cyst-এ বিবেচিত হয়।
Non-pharmacological management
- Rest from high-impact activity: running, jumping, prolonged squatting avoid।
- Ice pack: 15–20 মিনিট, দিনে 2–3 বার।
- Compression knee sleeve / crepe bandage।
- Elevation if swelling থাকে।
- Physiotherapy: quadriceps strengthening, hamstring stretching, ROM exercise।
- Weight reduction if overweight।
- Treat underlying OA/RA/meniscal pathology।
- Aspiration-এর পরে compression wrap ও short-term activity restriction।
Pharmacological drugs used by doctors in Bangladesh
Important: নিচের dose adult সাধারণ guidance। Renal disease, peptic ulcer, anticoagulant use, uncontrolled HTN, heart failure, pregnancy, elderly patient—এসব ক্ষেত্রে NSAID/steroid doctor-supervised হওয়া উচিত। একসাথে দুই NSAID দেওয়া যাবে না।
1. Paracetamol — mild pain relief
- Generic name: Paracetamol / Acetaminophen
- Therapeutic category: Analgesic, antipyretic
- Pharmacological class: Para-aminophenol derivative; mainly central prostaglandin inhibition
- Why used in Baker’s cyst: pain কমাতে; inflammation কমানোর ক্ষমতা NSAID-এর তুলনায় কম।
- Adult dose: 500–1000 mg orally every 6–8 hours PRN
- Maximum dose: সাধারণত 3 g/day safe target; selected adult-এ doctor-supervised 4 g/day পর্যন্ত।
- Duration: 3–5 days PRN; persistent pain হলে reassess।
- Side effects: nausea, rash, hepatotoxicity in overdose, liver injury risk with alcohol/liver disease।
- Interactions: warfarin long-term/high-dose use → INR বাড়তে পারে; alcohol, rifampicin, phenytoin, carbamazepine → hepatotoxicity risk; একই সঙ্গে multiple paracetamol-containing product avoid।
- Bangladesh available brand examples: Napa 500 mg, Ace 500 mg, Reset 500 mg, Aceta 500 mg; MedEx-এ Paracetamol-এর অসংখ্য brand listed আছে।
2. Topical NSAID — knee OA-associated pain/swelling হলে first-line practical option
Diclofenac Sodium Gel
- Generic name: Diclofenac Sodium topical gel
- Therapeutic category: Drugs for osteoarthritis, rheumatoid arthritis; NSAID
- Pharmacological class: Non-selective COX inhibitor
- Why used: local knee pain, inflammation, swelling কমাতে; oral NSAID-এর GI/renal systemic risk তুলনামূলক কম। NICE knee OA-তে topical NSAID offer করতে বলে।
- Dose: affected knee-তে thin layer apply 3–4 times/day; massage gently।
- Duration: 1–2 weeks; response না হলে reassess।
- Side effects: local burning, itching, rash, photosensitivity; extensive use করলে systemic NSAID adverse effect rare কিন্তু possible।
- Interactions: oral NSAID/anticoagulant use করলে caution; broken skin-এ লাগাবেন না।
- Bangladesh available brand examples: Clofenac Gel 1% w/w, Diclomol Gel 1% w/w, Fastfit Gel 1% w/w, Hitflam Gel 1% w/w, DicloGel 1% w/w।
Ibuprofen Gel
- Generic name: Ibuprofen topical gel
- Therapeutic category: NSAID for rheumatic/joint/muscle pain
- Pharmacological class: Propionic acid NSAID; COX inhibitor
- Why used: joint pain, rheumatic pain, sprain/strain-type pain কমাতে।
- Dose: affected area-তে 3–4 times/day।
- Duration: 1–2 weeks।
- Side effects: local rash/burning; NSAID allergy থাকলে avoid।
- Bangladesh available brand example: Flamex Topical Gel 5% w/w।
3. Oral NSAID — moderate pain/inflammation, short course
Ibuprofen
- Generic name: Ibuprofen
- Therapeutic category: Drugs for osteoarthritis, rheumatoid arthritis; NSAID
- Pharmacological class: Propionic acid derivative, non-selective COX inhibitor
- Why used: pain + inflammation + swelling কমাতে; mild-to-moderate inflammatory knee pain।
- Dose: 400 mg orally 2–3 times daily after meal
- Duration: 3–5 days; maximum short course 7 days unless doctor reviews।
- Side effects: dyspepsia, gastritis/ulcer/bleeding, renal impairment, BP rise, fluid retention, bronchospasm in NSAID-sensitive asthma।
- Interactions: anticoagulant/antiplatelet/SSRI/steroid → bleeding risk; ACEI/ARB + diuretic → AKI risk; lithium/methotrexate toxicity; aspirin antiplatelet effect may reduce।
- Bangladesh available brand examples: Flamex 400 mg, Profen 400 mg, Reumafen 400 mg, Intaflam 400 mg, G-Ibuprofen 400 mg।
Naproxen Sodium
- Generic name: Naproxen Sodium
- Therapeutic category: Drugs for osteoarthritis, rheumatoid arthritis; NSAID
- Pharmacological class: Propionic acid NSAID
- Why used: OA/meniscal inflammation-related pain, longer duration analgesia; BD prescriptions-এ common।
- Dose: 250–500 mg orally twice daily after meal
- Maximum: 1000 mg/day
- Duration: 5–7 days; long-term হলে renal function, BP, GI risk monitor।
- Side effects: gastritis, GI bleeding, edema, renal impairment, BP rise, dizziness।
- Interactions: anticoagulants/antiplatelets/SSRIs/steroids → GI bleed; ACEI/ARB/diuretics → renal risk; lithium/methotrexate ↑; other NSAID avoid।
- Bangladesh available brand examples: Naprox 250/500 mg, Naprosyn 250/500 mg, Napryn 250/500 mg, Naxin 250/500 mg, Nuprafen 250/500 mg, Naproxen 500 mg, Napsod 275/550 mg।
Diclofenac Sodium
- Generic name: Diclofenac Sodium
- Therapeutic category: Drugs for osteoarthritis, rheumatoid arthritis; NSAID
- Pharmacological class: Phenylacetic acid NSAID; COX inhibitor
- Why used: acute painful inflammatory knee swelling; কিন্তু GI/CV/renal risk বিবেচনা করতে হবে।
- Dose: 50 mg orally 2–3 times daily after meal; SR/TR 100 mg once daily
- Maximum: 150 mg/day
- Duration: 3–5 days preferred; prolonged use avoid unless reviewed।
- Side effects: dyspepsia, ulcer/bleeding, renal impairment, edema, BP rise, liver enzyme elevation, CV risk।
- Interactions: anticoagulant/antiplatelet/SSRI/steroid, ACEI/ARB/diuretic, lithium, methotrexate, other NSAID।
- Bangladesh available brand examples: Clofenac 50 mg/SR 100 mg, A-Fenac 50 mg, Intafenac 50 mg, Diclomol SR 100 mg, Diclonil 50 mg/SR 100 mg, Diclorex 50 mg/75 mg injection।
4. Selective COX-2 NSAID — GI intolerance থাকলে selected use
Etoricoxib
- Generic name: Etoricoxib
- Therapeutic category: NSAID; drugs used for OA/RA
- Pharmacological class: Selective COX-2 inhibitor
- Why used: OA/RA-related knee pain and inflammation; once-daily dosing; less gastric irritation than nonselective NSAID, but CV/BP risk বেশি বিবেচ্য।
- Dose: OA pain: 30–60 mg once daily; many BD prescriptions use 60 mg OD. RA/AS: 90 mg OD. Acute severe pain: 90–120 mg OD short course only.
- Duration: usually 3–7 days for acute knee pain; lowest effective dose, shortest duration।
- Side effects: hypertension, edema, dyspepsia, renal impairment, CV thrombotic risk, headache।
- Avoid/caution: ischemic heart disease, stroke, uncontrolled HTN, heart failure, CKD, pregnancy, anticoagulant use।
- Interactions: warfarin/anticoagulants, ACEI/ARB/diuretics, lithium, methotrexate, other NSAIDs।
- Bangladesh available brand examples: Tory 60/90/120 mg, Etorix 60/90/120 mg, Cox-E 60/90/120 mg, Etocox 60/90/120 mg, Etoshine 60/90 mg, Etovan 60/90/120 mg।
5. Gastroprotection with NSAID
Pantoprazole
- Generic name: Pantoprazole Sodium
- Therapeutic category: Anti-ulcerant; PPI
- Pharmacological class: Proton pump inhibitor
- Why used: oral NSAID দিলে gastritis/ulcer/GI bleeding risk কমাতে; NICE oral NSAID নেওয়ার সময় gastroprotective treatment যেমন PPI দিতে বলে।
- Dose: 20–40 mg once daily, breakfast-এর 30 মিনিট আগে
- Duration: NSAID যতদিন, সাধারণত 5–14 days; high-risk patient-এ longer doctor-directed।
- Side effects: headache, nausea, diarrhea/constipation; long-term হলে hypomagnesemia, B12 deficiency, fracture/C. difficile risk।
- Interactions: clopidogrel interaction omeprazole-এর তুলনায় কম হলেও caution; high-dose methotrexate; warfarin monitor।
- Bangladesh available brand examples: Pantonix 20/40 mg, Pantobex 20/40 mg, Protium 20/40 mg, Proton-P 20/40 mg, Pantid 20/40 mg, Pantolok 20/40 mg।
6. Corticosteroid injection — persistent painful cyst/effusion
Triamcinolone Acetonide injection
- Generic name: Triamcinolone Acetonide injection
- Therapeutic category: Corticosteroid, glucocorticoid
- Pharmacological class: Synthetic glucocorticoid anti-inflammatory
- Why used: knee synovitis/effusion কমাতে; cyst aspiration-এর পরে বা intra-articular injection হিসেবে inflammation কমায়। Ultrasound-guided aspiration + steroid injection symptomatic popliteal cyst-এ safe/effective option হিসেবে reported।
- Dose: usually 20–40 mg intra-articular knee injection once; specialist/orthopedics/rheumatology setting।
- Duration/effect: short-term relief; repeat injection সাধারণত 3 months-এর আগে না।
- Side effects: post-injection flare, pain, infection risk, transient hyperglycemia, skin depigmentation/atrophy, tendon weakening, repeated injectionsে cartilage risk।
- Interactions/caution: diabetes, anticoagulant use, active infection, immunosuppression; septic arthritis suspect হলে steroid নিষিদ্ধ।
- Bangladesh available brand examples: Alfacort 40 mg/ml, Cenolon 40 mg/ml, Cynocort 40 mg/ml, Emicort 40 mg/ml, Intracort 40 mg/ml, Trecilon 40 mg/ml, Triacin 40 mg/ml। MedEx এই formulation-কে IM/IA use-এর জন্য suitable বলে উল্লেখ করে।
Methylprednisolone Acetate injection
- Generic name: Methylprednisolone Acetate
- Therapeutic category: Glucocorticoid
- Pharmacological class: Depot corticosteroid
- Why used: intra-articular anti-inflammatory injection; knee synovitis/OA flare-এ specialist use।
- Dose: commonly 40 mg intra-articular knee once; patient-specific।
- Side effects/interactions: Triamcinolone-এর মতো।
- Bangladesh available brand examples: Depo-Medrol 40 mg/ml, Depo-Medrol 80 mg/2 ml, Depo-pred 40 mg/ml, Depomed 40 mg/ml or 80 mg/2 ml, Medrol 40 mg/ml or 80 mg/2 ml, Methsolon 40 mg/ml।
Bangladesh doctors commonly prescribe — practical list
- Mild pain, no major swelling:
Paracetamol 500 mg PRN + topical Diclofenac gel. - OA knee with posterior swelling/pain:
Topical NSAID first; inadequate হলে short course oral NSAID + Pantoprazole। - Moderate inflammatory pain:
Naproxen 500 mg BD or Ibuprofen 400 mg TDS or Diclofenac 50 mg BD/TDS — একটা NSAID মাত্র, সাথে PPI if oral NSAID। - High GI risk but low CV risk:
Etoricoxib selected cases; BP/CV/renal risk check করে। - Persistent large painful cyst / recurrent effusion:
Ultrasound-guided aspiration ± intra-articular steroid injection. - Meniscal tear/locking/recurrent cyst:
Orthopedic referral; arthroscopy may be needed. - RA/gout suspected:
Rheumatology-directed disease-specific treatment; Baker’s cyst-এর জন্য routine antibiotic/diuretic/oral steroid নয়।
Prevention — কীভাবে প্রতিরোধ করবেন
- Knee OA/RA/gout properly control করা।
- Weight reduction: BMI high হলে knee load কমানো।
- Quadriceps strengthening and hamstring stretching regularly।
- High-impact activity কমানো; swimming/cycling/low-impact walking better।
- Long squatting, heavy stair climbing, kneeling avoid।
- Knee injury হলে early evaluation and rehab।
- Proper footwear and knee support when needed।
- Diabetes/HTN/CKD থাকলে NSAID self-medication avoid।
- Cyst aspiration-এর পরে compression + follow-up; underlying pathology treat না করলে recurrence হবে।
Urgent referral / red flags
- Sudden calf swelling + pain + redness — DVT/rupture rule out
- Fever, hot swollen knee — septic arthritis suspect
- Severe pain with tense calf — compartment syndrome concern
- Numbness, foot weakness, absent pulse
- Rapidly growing hard mass, night pain, weight loss — tumor concern
- Anticoagulant use with sudden swelling
1. Overview / Summary
Baker’s cyst হলো হাঁটুর পিছনে synovial fluid-filled cyst, সাধারণত OA, meniscal tear, RA বা knee synovitis-এর কারণে হয়। Diagnosis clinical হলেও ultrasound/Doppler/MRI specific indication অনুযায়ী লাগে। Treatment-এর মূল হলো pain control, inflammation control, physiotherapy, weight control এবং underlying knee pathology management। Symptomatic বা recurrent cyst-এ ultrasound-guided aspiration ± corticosteroid injection করা যায়; surgery rarely needed.
2. Actionable Plan / Steps
- Posterior knee swelling হলে clinical knee exam + DVT red flag assessment করুন।
- No red flag হলে: rest, ice, compression, physiotherapy, topical NSAID শুরু করা যায়।
- Pain moderate হলে: একটি oral NSAID only short course + PPI, risk check করে।
- Calf swelling/sudden pain হলে: venous Doppler urgent।
- Recurrent/large painful cyst হলে: ultrasound-guided aspiration ± steroid injection।
- Locking/meniscal signs/OA severe হলে: MRI knee + orthopedic referral।
- RA/gout/infection suspicion থাকলে targeted lab + specialist management।
3. Reference List — Textbook + Guideline + DOI
Textbooks
- Harrison’s Principles of Internal Medicine, 21st ed. McGraw Hill; Musculoskeletal and rheumatologic disorders / osteoarthritis sections.
- Davidson’s Principles and Practice of Medicine, 24th ed. Elsevier; Musculoskeletal disorders / osteoarthritis and inflammatory arthritis sections.
- Kelley and Firestein’s Textbook of Rheumatology, 11th ed. Elsevier; osteoarthritis, synovitis, regional periarticular disorders.
- Campbell’s Operative Orthopaedics, 14th ed. Elsevier; knee arthroscopy, meniscal pathology, popliteal cyst management.
Guidelines
- NICE NG226: Osteoarthritis in over 16s: diagnosis and management, 2022 — topical NSAID first for knee OA; oral NSAID with gastroprotection when needed.
- ACR/Arthritis Foundation Guideline for Management of Hand, Hip, and Knee Osteoarthritis, 2019/2020 — topical/oral NSAID and intra-articular corticosteroid recommendations. DOI: 10.1002/art.41142.
- AAOS OrthoInfo: Baker’s cyst diagnosis and nonsurgical/surgical treatment options.
Peer-reviewed articles with DOI
- Frush TJ, Noyes FR. Baker’s Cyst: Diagnostic and Surgical Considerations. Sports Health. 2015;7(4):359–365. DOI: 10.1177/1941738113520130.
- Smith MK, Lesniak B, Baraga MG, et al. Treatment of Popliteal Cysts With Ultrasound-Guided Aspiration, Fenestration, and Injection. Sports Health. 2015;7(5):409–414. DOI: 10.1177/1941738115585520.
- Liu K, et al. Diagnostic accuracy of ultrasound for assessment of Baker’s cyst. Journal of Orthopaedic Surgery and Research. 2022. DOI: 10.1186/s13018-022-03430-9.
Md.Rafiqul Islam Lipu,Date:-18-06-2026 Thursday,Time:-1-35-12 Pm