A 55-year-old man with severe osteoporosis (T-score −3.2) sustains a fall from standing height and presents with a proximal humerus fracture. Imaging reveals a 4-part fracture with severe comminution of the surgical neck and both tuberosities, with an intact articular surface. There is no neurovascular compromise. The patient is medically fit for surgery. What is the most appropriate surgical management?

Explanation

## Surgical Management of 4-Part Proximal Humerus Fracture in the Elderly Osteoporotic Patient ### Fracture Classification and Clinical Context **Key Point:** A 4-part proximal humerus fracture involves displacement of the surgical neck, greater tuberosity, lesser tuberosity, and the articular segment—creating severe soft tissue stripping and high risk of avascular necrosis (AVN). In an elderly patient (55 years) with severe osteoporosis (T-score −3.2) and severe comminution of both tuberosities, the choice of arthroplasty type is critical. ### Why Reverse Shoulder Arthroplasty (RSA) is the Correct Answer **High-Yield:** Current evidence (Boileau et al., Gallinet et al., and multiple meta-analyses) strongly favors **Reverse Shoulder Arthroplasty** over hemiarthroplasty for 4-part proximal humerus fractures in elderly patients with osteoporosis, particularly when tuberosity comminution is severe. The critical distinction: - **Hemiarthroplasty** depends entirely on **tuberosity healing** for functional outcome. When tuberosities are severely comminuted (as in this case), they fail to heal in a high proportion of patients, leading to poor forward elevation, persistent pain, and high reoperation rates. - **Reverse Shoulder Arthroplasty** does NOT rely on tuberosity healing for function. The deltoid-driven biomechanics of RSA provide reliable pain relief and functional elevation even when tuberosities fail to heal. ### Surgical Options Comparison | Surgical Approach | Indication | Key Limitation in This Case | |---|---|---| | **Hemiarthroplasty** | 4-part fracture, intact glenoid, tuberosities repairable | Relies on tuberosity healing; poor outcomes with severe comminution in osteoporosis | | **Reverse arthroplasty** | 4-part fracture, elderly, severe comminution, osteoporosis | **Best choice here** — function independent of tuberosity healing | | **ORIF with plate** | 2–3 part fractures, good bone quality | High AVN (10–35%) and hardware failure in severe osteoporosis | | **Intramedullary nail** | Pathologic/segmental fractures | Not appropriate for complex 4-part fractures | ### Pathophysiology: Why Tuberosity Healing Matters 1. In hemiarthroplasty, the greater and lesser tuberosities must be reattached and heal to the prosthesis for rotator cuff function. 2. Severe comminution + osteoporosis = high nonunion rate of tuberosities (~30–50% in some series). 3. Failed tuberosity healing → poor rotator cuff function → poor forward elevation → unsatisfactory outcome. 4. RSA bypasses this dependency entirely via deltoid-mediated elevation. ### Evidence Base **Clinical Pearl:** Per Boileau et al. (JBJS, 2013) and subsequent meta-analyses, RSA for acute 4-part proximal humerus fractures in patients >65 years with osteoporosis yields significantly better Constant scores, forward elevation, and lower reoperation rates compared to hemiarthroplasty. This has shifted the standard of care toward RSA in this demographic. ### Decision Framework for 4-Part Fracture Management ``` 4-Part PHF → Elderly + Osteoporosis + Severe Tuberosity Comminution → Tuberosity healing unreliable → Hemiarthroplasty: poor functional prognosis → Reverse Shoulder Arthroplasty: PREFERRED ``` ### Why Other Options Are Incorrect - **Option A (Hemiarthroplasty):** Historically the gold standard, but now superseded by RSA in elderly osteoporotic patients with severe tuberosity comminution. Outcomes are unpredictable when tuberosities cannot be reliably repaired. - **Option B (ORIF with plate):** Contraindicated in severe osteoporosis with 4-part comminution — high rates of AVN, hardware failure, and nonunion. - **Option D (Intramedullary nail):** Not appropriate for complex 4-part fractures with tuberosity involvement; poor fixation in comminuted patterns. *Reference: Boileau P et al., JBJS 2013; Gallinet D et al., Orthopaedics & Traumatology 2009; Neer CS II classification; Rockwood & Matsen's "The Shoulder," 5th edition.*