Orthogate Subspecialty Journal Scan: Shoulder & Elbow
Curated critical appraisals of recent high-impact trials across upper extremity surgery, focusing on long-term randomized fracture outcomes, regenerative tendinopathy therapeutics, and advanced arthroplasty biomechanics.
- 1. Long-Term Outcomes of RSA vs Nonoperative Treatment for 3- or 4-Part Proximal Humerus Fractures - Journal of Shoulder and Elbow Surgery Level I RCT Follow-up
- 2. Morphological Changes in Tennis Elbow After PRP Injection: Randomized MRI-Based Trial - Journal of Shoulder and Elbow Surgery Level I RCT
- 3. Biomechanical Changes and Real-World Kinematics After Reverse Shoulder Arthroplasty - Journal of Shoulder and Elbow Surgery Level I Systematic Review
1. Long-Term Outcomes of Reverse Shoulder Arthroplasty Versus Nonoperative Treatment for 3- or 4-Part Proximal Humerus Fractures in Elderly Patients: Results From a Prior Randomized Clinical Trial
Authors: Lopiz Y, Alcobia-Diaz B, Coderch J, Rodrigo-Muro S, Garcia-Fernandez C et al. | Journal: Journal of Shoulder and Elbow Surgery (Sep 2026) | View Source / DOI
Situation
Complex 3- and 4-part proximal humerus fractures (PHFs) in elderly, osteoporotic patients pose a recurring clinical dilemma. While short-term RCT data favor reverse shoulder arthroplasty (RSA) over nonoperative care, long-term survivorship, functional durability, and late glenoid loosening concerns have historically fueled conservative advocacy.
Background
Elderly patients treated conservatively frequently experience malunion, severe tuberosity resorption, and pseudoparalysis. Conversely, surgical intervention carries perioperative morbidity, scapular notching, and risks of prosthetic infection. Extended longitudinal follow-up beyond 7 to 10 years is essential to confirm whether initial surgical functional gains endure.
Assessment & Findings
- Study Design & Cohort: Long-term follow-up of a prospective Level-I randomized controlled trial initially enrolling 62 patients aged 70 years or older with displaced 3- or 4-part PHFs. Surviving patients were evaluated at extended long-term follow-up (mean age at review: 88 years nonoperative, 92 years RSA).
- Functional Endpoints: RSA demonstrated statistically and clinically superior functional outcomes compared to nonoperative care. Constant scores remained significantly higher in the RSA cohort (mean 58.4 vs 42.1, p = 0.012). Active forward elevation was markedly preserved in the RSA arm (mean 125 degrees vs 90 degrees, p = 0.008).
- Pain, Complications & Survivorship: Visual analog scale pain scores were lower in the RSA group (1.1 vs 2.8, p = 0.024). Zero cases of late aseptic glenoid loosening or revision surgery occurred in the surviving RSA cohort. In the nonoperative group, 58% demonstrated severe malunion with persistent pain during activities of daily living.
Recommendation & Practice Takeaway
Clinical Pearl: Reverse shoulder arthroplasty provides durable, life-long functional superiority over conservative care for displaced 3- and 4-part proximal humerus fractures in geriatric patients. Surgeons should not fear late catastrophic loosening in this octogenarian and nonagenarian demographic; immediate semi-constrained arthroplasty reliably preserves overhead function and independence for the remainder of the patient's life.
2. Morphological Changes in Tennis Elbow After PRP Injection: A Novel MRI-Based Assessment in a Randomized Controlled Study
Authors: Walecka J, Dzianach M, Rachwal-Czyzewicz I, Ringwelska Z, Lubiatowski P | Journal: Journal of Shoulder and Elbow Surgery (Sep 2026) | View Source / DOI
Situation
Platelet-rich plasma (PRP) is widely utilized for recalcitrant lateral epicondylar tendinopathy (tennis elbow), yet critics contend that reported benefits represent placebo effects rather than true biological tendon regeneration. Objective imaging quantification of structural tendon remodeling has been historically lacking.
Background
Corticosteroid injections provide rapid short-term relief but induce long-term collagen necrosis and elevated rupture rates. While autologous blood products aim to stimulate tenocyte proliferation, establishing whether ultrasound-guided PRP alters MRI morphology compared to blinded saline controls is critical for clinical guideline validation.
Assessment & Findings
- Study Design & Cohort: Double-blind, randomized, placebo-controlled trial enrolling 71 patients with chronic, refractory lateral epicondylitis failing at least 6 months of physical therapy. Patients were randomized to ultrasound-guided leukocyte-poor PRP injection vs saline control with high-resolution 3T MRI protocols (intraclass correlation coefficient > 0.90).
- Structural MRI Remodeling: At 6 months post-injection, the PRP cohort demonstrated statistically significant reduction in common extensor tendon cross-sectional area (mean reduction 18.4% vs 2.1% control, p = 0.002) and marked resolution of intra-tendinous T2 hyperintensity signal defects.
- Clinical Correlation: Quantitative structural healing on MRI correlated directly with Patient-Rated Tennis Elbow Evaluation (PRTEE) score improvements (r = 0.68, p < 0.001) and grip strength recovery (p = 0.014), establishing true biological tissue repair rather than isolated analgesia.
Recommendation & Practice Takeaway
Clinical Pearl: Autologous leukocyte-poor PRP induces authentic tissue remodeling and tendon volume normalization visible on objective 3T MRI. For recalcitrant lateral epicondylitis failing eccentric physical therapy, ultrasound-guided PRP provides a verifiable biological alternative to surgical debridement while avoiding the deleterious tissue atrophy associated with corticosteroid injections.
3. Biomechanical Changes After Reverse Total Shoulder Arthroplasty: A Systematic Review of Advanced Measurement Technologies
Authors: Thomson A, Felix T, Lichtwark G, Whitehouse S, Gupta A et al. | Journal: Journal of Shoulder and Elbow Surgery (Sep 2026) | View Source / DOI
Situation
Reverse total shoulder arthroplasty (rTSA) reliably relieves pain and restores active elevation, but the underlying in vivo kinematics, muscle activation patterns, and real-world arm utilization remain incompletely characterized across modern prosthetic designs.
Background
Traditional clinical outcome scores (ASES, Constant) rely on subjective patient reporting that frequently masks subtle biomechanical compensations. Integrating dynamic optical motion capture, electromyography (EMG), and wearable inertial measurement units (IMUs) provides objective joint-level mechanics.
Assessment & Findings
- Systematic Synthesis: 24 quantitative biomechanical studies (cohort and case-control) utilizing optical motion capture, EMG, and wearable IMU sensors evaluating post-rTSA kinematics against contralateral shoulders and healthy controls.
- Scapulothoracic vs Glenohumeral Mechanics: Forward elevation after rTSA is restored primarily via compensatory scapulothoracic upward rotation, retraction, and posterior tilt rather than normalization of glenohumeral kinematics. Glenohumeral contribution to total elevation and axial rotation remained significantly reduced compared to healthy controls.
- Muscle Recruitment & Real-World Activity: Surface and fine-wire EMG demonstrated marked recruitment of the anterior deltoid and upper trapezius, with persistent latency in posterior cuff recruitment. Real-world wearable sensor tracking confirmed improved interlimb daily usage, though cumulative time spent above shoulder height remained restricted (< 5% of daily active time).
Recommendation & Practice Takeaway
Clinical Pearl: Reverse total shoulder arthroplasty functions as a deltoid-scapulothoracic kinematic engine rather than a restored anatomical glenohumeral joint. Postoperative physical therapy protocols must specifically prioritize periscapular strengthening (serratus anterior, lower trapezius) and deltoid conditioning, rather than expecting spontaneous anatomical movement patterns.
