A 38-year-old woman from Delhi presents with a comminuted fracture of the proximal humerus (4-part fracture) sustained after a fall from height. CT imaging shows significant displacement and rotational deformity. The orthopedic surgeon discusses fixation options, including open reduction with plate fixation versus hemiarthroplasty. Which implant characteristic makes plate fixation preferable to hemiarthroplasty in this patient?

Explanation

## Plate Fixation vs Hemiarthroplasty in Proximal Humerus Fractures ### Clinical Decision-Making in 4-Part Fractures **Key Point:** In a 38-year-old patient with a 4-part proximal humerus fracture, plate fixation is preferred over hemiarthroplasty because it preserves the humeral head, maintains native anatomy, and allows biological healing—critical in a younger patient with good bone quality. ### Comparison of Treatment Options | Parameter | Plate Fixation | Hemiarthroplasty | |-----------|----------------|------------------| | Humeral head preservation | Yes (biological healing) | No (replaced) | | Age suitability | Younger patients (< 65 yrs) | Older patients (> 65 yrs) | | Long-term outcomes | Better in young patients | Better in elderly | | Revision surgery risk | Lower | Higher (loosening, wear) | | Return to function | 3–6 months | 6–12 months | | Infection rate | Similar | Similar | | ROM recovery | Better | Variable | ### Why Plate Fixation Is Optimal Here 1. **Humeral head preservation:** Plate fixation (typically with a proximal humerus plate or PHILOS) maintains the native humeral head, allowing biological fracture healing through callus formation and remodeling. 2. **Age factor:** At 38 years, this patient has excellent bone quality and a long life expectancy. Preserving the native joint avoids the long-term complications of arthroplasty (loosening, wear, revision surgery). 3. **Functional anatomy:** The native humeral head maintains proprioception, rotator cuff function, and normal biomechanics better than a prosthetic replacement. 4. **Reversibility:** If plate fixation fails, conversion to arthroplasty is still possible; the reverse is not true. **High-Yield:** The Neer classification guides treatment: 2-part and 3-part fractures are typically managed with plate fixation; 4-part fractures in young patients with good bone quality also benefit from plate fixation if the blood supply to the humeral head can be preserved (via careful soft tissue handling). **Mnemonic:** **PLATE for Young, PROSTHESIS for Old** — Plate fixation in younger patients with 4-part fractures; hemiarthroplasty reserved for elderly patients (> 65–70 years) with poor bone quality or when the humeral head is devascularized. **Clinical Pearl:** The key to successful plate fixation in 4-part fractures is anatomical reduction, preservation of soft tissue attachments (especially the rotator cuff), and careful assessment of humeral head vascularity intraoperatively. If the head is clearly devascularized, hemiarthroplasty becomes necessary. ### Why Other Options Are Incorrect - **Immediate stability without physiotherapy:** No fracture fixation method eliminates the need for post-operative physiotherapy. Gentle ROM exercises are essential to prevent stiffness and restore function. - **Infection risk elimination:** Both plate fixation and hemiarthroplasty carry similar infection risks (< 2–3% in elective cases). Plate fixation does not eliminate infection risk. - **Faster return to overhead activities:** Plate fixation requires 3–6 months before overhead activities; hemiarthroplasty patients may have similar or longer timelines depending on soft tissue healing.