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Prp in orthopaedics 10 mark pg answer with flow chart and images

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"platelet-rich plasma"[MeSH Terms] AND "orthopedics"[MeSH Terms]

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PRP platelet rich plasma orthopaedics mechanism preparation classification clinical applications 2024

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https://pmc.ncbi.nlm.nih.gov/articles/PMC12754507

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Medical flowchart diagram showing PRP (Platelet-Rich Plasma) preparation and mechanism of action in orthopaedics. The flowchart should show: Step 1: Blood Collection (20-60 mL venous blood with anticoagulant) → Step 2: First Centrifugation (soft spin 1000-1200 rpm, 10 min) separating Red Blood Cells layer, Buffy coat (platelets + WBC), and Platelet Poor Plasma → Step 3: Second Centrifugation (hard spin 2000-3000 rpm, 15 min) concentrating platelets → Step 4: PRP Product (platelet concentration 3-8x baseline, ~1 million platelets/μL) → Step 5: Activation (thrombin + calcium chloride, or autologous activation at injury site) → Step 6: Growth Factor Release (PDGF, TGF-β, VEGF, IGF-1, EGF, FGF) → Step 7: Clinical Application at target site. Clean professional medical diagram style with blue and red color scheme, labeled boxes with arrows.

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Medical classification diagram of PRP (Platelet-Rich Plasma) types used in orthopaedics. Show a 2x2 grid classification table based on two axes: Leukocyte content (Low/High) vs Fibrin architecture (Liquid plasma / Fibrin gel). Four quadrants: 1) P-PRP - Pure Platelet Rich Plasma (low leukocytes, liquid), 2) L-PRP - Leukocyte and Platelet Rich Plasma (high leukocytes, liquid), 3) P-PRF - Pure Platelet Rich Fibrin (low leukocytes, gel), 4) L-PRF - Leukocyte and Platelet Rich Fibrin (high leukocytes, gel). Below show PAW classification boxes: P=Platelet concentration, A=Activation method, W=White blood cell content. Clinical uses column: OA joints prefer LP-PRP, tendons prefer L-PRP. Professional medical diagram, clean colors, clearly labeled.

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Medical diagram showing clinical applications of PRP in orthopaedics with anatomical illustrations. A central circle labeled "PRP in Orthopaedics" with radiating arrows to 6 application boxes: 1) Osteoarthritis - knee joint illustration, shows intra-articular injection; 2) Tendinopathy - lateral epicondyle/Achilles tendon illustration, shows peri-tendinous injection; 3) Bone Healing - fracture site with callus, augments non-unions; 4) Ligament/ACL Injuries - knee ligament diagram; 5) Rotator Cuff Repair - shoulder anatomy, reduces retear rate; 6) Cartilage Defects - articular cartilage repair. Each box has a small anatomical icon. Clean medical illustration style, blue and orange color scheme, professional textbook quality.

Here is your complete 10-mark PG answer on PRP in Orthopaedics:

PLATELET-RICH PLASMA (PRP) IN ORTHOPAEDICS

Definition

Platelet-Rich Plasma (PRP) is an autologous concentration of platelets suspended in a small volume of plasma, prepared from the patient's own blood, with a platelet count 3 to 8 times above baseline (approximately 1 million platelets/μL). It is a form of regenerative medicine that harnesses the patient's own growth factors to accelerate tissue healing.

Composition

ComponentRole
Platelets (>4 × 10⁵/μL)Source of growth factors
Alpha granulesContain PDGF, TGF-β, IGF-1, VEGF, EGF
Dense granulesContain serotonin, ADP, calcium
Plasma proteinsFibrin scaffold, fibronectin, vitronectin

Preparation - Step-by-Step Flowchart

PRP Preparation Flowchart
Double-Spin Technique (most common):
  1. Blood Collection - 20-60 mL venous blood collected into ACD (Acid Citrate Dextrose) anticoagulant tubes
  2. First Centrifugation (Soft Spin) - 1000-1200 rpm for 8-10 min
    • Separates: Red cell layer (bottom) + Buffy coat (platelets + WBC) + Platelet-poor plasma (top)
  3. Plasma Transfer - Buffy coat + upper plasma carefully aspirated
  4. Second Centrifugation (Hard Spin) - 2000-3000 rpm for 10-15 min
    • Concentrates platelets into pellet
  5. Resuspension - Supernatant discarded, pellet resuspended in small plasma volume (~3-8 mL)
  6. Activation - Optional external activation with thrombin + CaCl₂, or left for autologous activation at injection site

Classification of PRP

PRP Classification Diagram

Dohan Ehrenfest Classification (4 Families):

TypeLeukocytesFibrinExample
P-PRP (Pure Platelet-Rich Plasma)AbsentLiquidPRGF-Endoret
L-PRP (Leukocyte-PRP)PresentLiquidBiomet GPS, ACP
P-PRF (Pure Platelet-Rich Fibrin)AbsentGel/MembraneFibrinet
L-PRF (Leukocyte-PRF)PresentGel/MembraneIntra-Spin L-PRF

PAW Classification (Delong et al.):

  • P = Platelet concentration (absolute count)
  • A = Activation method (exogenous/autologous)
  • W = White blood cell content (above/below baseline)

Mechanism of Action

Upon activation, alpha-granules degranulate releasing growth factors that drive healing through four key pathways:
Platelet Activation
       ↓
Alpha-granule degranulation
       ↓
Growth Factor Release
  ├── PDGF (Platelet-Derived GF) → Cell proliferation, collagen synthesis, chemotaxis
  ├── TGF-β (Transforming GF-β) → ECM production, cartilage repair
  ├── VEGF (Vascular Endothelial GF) → Angiogenesis, neovascularization
  ├── IGF-1 (Insulin-like GF-1) → Cell proliferation, bone mineralization
  ├── EGF (Epidermal GF) → Fibroblast proliferation
  └── FGF (Fibroblast GF) → Wound healing
       ↓
       ├── Tissue Regeneration
       ├── Anti-inflammation (↑M2 macrophages, ↓IL-1, TNF-α)
       ├── Analgesia (serotonin from dense granules)
       └── Antimicrobial effect

Clinical Applications in Orthopaedics

PRP Clinical Applications

1. Osteoarthritis (OA)

  • Knee OA: Intra-articular PRP injection; improves pain and function, particularly in early-to-moderate OA (Grade I-II Kellgren-Lawrence); L-PRP preferred
  • Mechanism: inhibits synoviocyte activation, reduces IL-1β and TNF-α, promotes chondrocyte survival
  • Evidence: Meta-analyses show superiority over hyaluronic acid at 3-6 months

2. Tendinopathies

  • Lateral epicondylitis (Tennis Elbow): Peri-tendinous injection; most robust evidence
  • Patellar tendinopathy, Achilles tendinopathy: Ultrasound-guided intratendinous injection
  • Rotator Cuff: Adjunct to arthroscopic repair; a 2024 RCT (Rossi et al.) showed reduced retear rate from 34.1% to 15.2% with LP-PRP
  • Mechanism: Promotes tenocyte proliferation, collagen type-I synthesis, neovascularization

3. Bone Healing

  • Fracture non-unions and delayed unions: PRP applied at fracture site (open or percutaneous)
  • Bone grafts: PRP mixed with autograft or allograft to improve osteogenesis
  • Mechanism: PDGF and TGF-β stimulate osteoblast proliferation; VEGF enhances revascularization

4. Ligament Injuries

  • ACL/PCL tears: Adjunct in reconstruction (applied at graft-tunnel interface)
  • Medial collateral ligament sprains: Accelerates healing in partial tears
  • Mechanism: Fibroblast activation, collagen remodeling

5. Cartilage Defects

  • Osteochondral lesions: Combined with microfracture or as standalone injection
  • Adjunct to ACI (Autologous Chondrocyte Implantation)

6. Spine

  • Degenerative disc disease, facet joint injections
  • Lumbar disc pathologies (emerging evidence)

Contraindications

AbsoluteRelative
Thrombocytopenia (<100,000/μL)NSAIDs use (stop 1 week prior)
Active infection at siteCorticosteroid use
Platelet dysfunction syndromesSmoking
Anticoagulant therapyAnemia
Active malignancy

Advantages & Limitations

Advantages:
  • Autologous - minimal immunogenic risk
  • Minimally invasive, day-care procedure
  • Multiple growth factors delivered simultaneously
  • No risk of disease transmission
Limitations:
  • No standardized preparation protocol
  • Large inter-individual variation in platelet yield
  • Variable clinical outcomes due to heterogeneous formulations
  • Cost - not universally covered by insurance
  • Limited high-quality RCT evidence in several indications

Recent Evidence (2024-2026)

  • Rossi et al. 2024 showed LP-PRP as adjuvant to rotator cuff repair reduced retear rates significantly (15.2% vs 34.1%)
  • A 2026 systematic review (PMID: 41290406) highlights poor standardization in lumbar disc PRP studies, underscoring need for MIBO guideline adherence
  • Leukocyte-poor PRP (LP-PRP) is now preferred for intra-articular use (joint spaces) while leukocyte-rich PRP (LR-PRP) is preferred for tendons and ligaments

Summary Table

ParameterDetails
SourceAutologous venous blood
Platelet target≥ 1 × 10⁶ platelets/μL (3-8× baseline)
PreparationDouble centrifugation (soft spin + hard spin)
Key growth factorsPDGF, TGF-β, VEGF, IGF-1, EGF, FGF
Best evidenceKnee OA, lateral epicondylitis, rotator cuff augmentation
Preferred type (joints)LP-PRP (leukocyte-poor)
Preferred type (tendons)LR-PRP (leukocyte-rich)
Frequency of injection1-3 injections, 2-4 weeks apart
Key Exam Points:
  • PRP platelet count must be >4 × 10⁵/μL to be called PRP
  • "Optimal" platelet concentration is ~1 million/μL (5× baseline)
  • L-PRP is pro-inflammatory (suitable for tendons/ligaments); P-PRP is anti-inflammatory (suitable for joints/cartilage)
  • PAW classification is the most clinically practical system
  • PRP does NOT replace surgery - it is an adjunct or used in early/mild disease
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