Management of Partial-Thickness Tear of the Posterior Horn of Medial Meniscus

Clinical Context

Step 1 - Initial Assessment (Before Deciding Treatment)

• Campbell's Operative Orthopaedics 15th Ed 2026

Step 2 - Conservative (Non-Surgical) Management — First Line

• Bailey and Love's Short Practice of Surgery, 28th Ed

A. Activity Modification

• Avoid high-impact activities (running, jumping, squatting under load, kneeling)
• Relative rest during the acute phase (1-2 weeks)
• Gradual return to activity as symptoms allow

B. Analgesia and Anti-Inflammatories

• NSAIDs (oral): e.g., ibuprofen, naproxen, diclofenac - with gastroprotection given her age
• Paracetamol (acetaminophen): adjunct for pain relief with fewer GI side effects
• Topical NSAIDs: (diclofenac gel) are preferred in older adults to minimize systemic side effects
• Ice packs: 15-20 minutes several times daily to reduce swelling

C. Physiotherapy (Cornerstone of Conservative Management)

• Quadriceps strengthening (especially VMO - vastus medialis oblique): straight-leg raises, short arc quads
• Hamstring and calf strengthening: reduces compressive load on meniscus
• Hip abductor strengthening: reduces medial compartment loading
• Proprioception and balance training: prevents re-injury
• Range-of-motion exercises: prevents stiffness
• Gait training: correction of altered gait patterns
• Low-impact aerobic conditioning (swimming, cycling) is encouraged

D. Intra-articular Injections (if physiotherapy + NSAIDs insufficient)

• Corticosteroid injection (e.g., triamcinolone or methylprednisolone): provides significant short-term pain and swelling relief, especially if coexistent synovitis
• Hyaluronic acid (viscosupplement) injection: controversial per recent AAOS guidelines, but may provide medium-term relief in mild-to-moderate OA
• Maximum 3-4 steroid injections per year advised

E. Supportive Measures

• Knee brace (unloader brace or neoprene sleeve): improves proprioception and reduces compartmental loading
• Weight loss: each kg of body weight reduction decreases knee joint load by ~4 kg
• Cushioned footwear: reduces joint impact
• Walking aids if needed during acute phase

• Textbook of Family Medicine, 9th Ed

Step 3 - Surgical Management (If Conservative Treatment Fails)

A. Arthroscopic Partial Meniscectomy (APM)

• The most common surgical option for degenerative posterior horn tears
• The goal is to excise the torn unstable flap while preserving as much healthy meniscal tissue as possible
• "Even partial meniscectomy has been shown to increase joint wear; reasonable judgment must be used in planning meniscal surgery to preserve functional meniscal tissue." - Campbell's Operative Orthopaedics, 15th Ed

B. Meniscal Repair

• Generally not suitable for partial-thickness degenerative tears in a 59-year-old
• Repair is more appropriate for: young patients, acute traumatic tears, peripheral vascular zone tears (red-red zone), complete longitudinal tears with good healing potential
• Successful repair reported in >80% when done in conjunction with ACL reconstruction, but success rates are lower for isolated repairs
• Rheumatology 2-Volume Set (Elsevier, 2022)

C. If Significant Coexisting OA is Present

• In patients with moderate-to-severe OA, APM may accelerate joint degeneration
• These patients may be better served by:
  • Continued conservative management
  • High tibial osteotomy (if varus malalignment present)
  • Total knee replacement (TKR) if end-stage OA

Summary Algorithm

59F with partial-thickness posterior horn medial meniscus tear
         |
         ↓
    Get weight-bearing X-rays
         |
         ↓
Significant OA? → YES → Manage OA primarily (conservative, possible TKR later)
         |
        NO
         |
         ↓
Mechanical symptoms (locking, giving way)? 
   YES → Arthroscopic evaluation ± partial meniscectomy
   NO  → Conservative management 3-6 months:
              NSAIDs + Physiotherapy + Activity modification
              ± Intra-articular injection
                     |
                     ↓
         Symptoms persist after 3-6 months?
              YES → Consider arthroscopic partial meniscectomy
              NO  → Continue conservative care

Key Points

1. Degenerative partial-thickness tears in older adults are managed conservatively first - surgery is not the default.
2. Physiotherapy is the cornerstone - quadriceps and hip strengthening significantly reduce symptoms.
3. Meniscal repair is not indicated for this presentation - the tear lacks the healing potential needed (age, avascular inner zone, partial thickness, degenerative nature).
4. Coexisting OA changes the picture - address OA simultaneously; APM in a severely arthritic knee may not be beneficial.
5. Partial meniscectomy is the surgical fallback when conservative treatment fails, but with the caveat that it accelerates cartilage wear over time.

• Campbell's Operative Orthopaedics, 15th Ed 2026 - Chapter on meniscal surgery
• Bailey and Love's Short Practice of Surgery, 28th Ed - Meniscal tears section
• Textbook of Family Medicine, 9th Ed - Meniscus injuries
• Rheumatology 2-Volume Set (Elsevier, 2022) - Meniscal injuries