Table of Contents
- Total Shoulder Arthroplasty Complications by Procedure Type
- Subscapularis Failure (Anatomic TSA, 3–5%)
- Aseptic Glenoid Loosening (Anatomic TSA, 2–5%)
- Prosthetic Dislocation (Higher in rTSA, 0.7–3%)
- Periprosthetic Joint Infection (Both Procedures, 1–2%)
- When to Escalate: The Complete Trigger List
- The Bottom Line
- FAQs
Clinical Summary:
The Gap: Most available content on total shoulder arthroplasty complications is written for patients, not clinicians. Rehabilitation professionals, who see these patients most frequently in the post-acute period, often lack a structured, procedure-specific framework for what to watch for and when to escalate.
The Evidence: Overall TSA complication rates are 8.9–12.5%. Most complications are manageable when detected early. Subscapularis failure (3–5% of aTSA), glenoid loosening (2–5% of aTSA), prosthetic dislocation (0.7–3% of rTSA), and infection (1–2% of both) each have specific early warning signs that present to the rehabilitation clinician before they reach the surgeon's office.
The Takeaway: Systematic assessment at every session (not just when something seems wrong) is the standard. Any acute change in pain, loss of previously achieved motion or strength, instability symptoms, or signs of infection warrants same-day surgical team communication, not continued conservative management.
Total shoulder arthroplasty complications range from 8.9–12.5%. Most of those complications are manageable when caught early enough to intervene before they compound. The rehabilitation clinician is the person most likely to be present at the moment a complication begins to declare itself, because they see these patients more frequently than anyone else in the care continuum during the post-acute period.
That position is a clinical responsibility. Systematic assessment at every session, knowledge of what each complication looks like in its early presentation, and a clear escalation threshold are the tools that convert that responsibility into better outcomes.
Total Shoulder Arthroplasty Complications by Procedure Type
Anatomic and reverse TSA have different complication profiles, because their biomechanics and soft tissue demands are different. Knowing which procedure your patient had tells you which complications to prioritize in your assessment.
Revision Rate Comparison:
2×
Anatomic TSA revision rate (5.6%) vs reverse TSA (2.5%) at 5 years, reflecting the higher soft tissue demands and failure modes of the anatomic design.
- Anatomic TSA: Subscapularis failure 3.1%, glenoid loosening 2.5%, infection 1.3%, instability 1.2%. Overall 10.7%, revision 5.6%.
- Reverse TSA: Scapular notching 14.4%, periprosthetic fracture 0.8%, glenoid loosening 0.7%, dislocation 0.7%. Overall 8.9%, revision 2.5%.
Anatomic TSA complication profile: Subscapularis failure (3.1%), aseptic glenoid loosening (2.5%), infection (1.3%), instability (1.2%). Overall complication rate 10.7%, revision rate 5.6% at 5 years.
Reverse TSA complication profile: Scapular notching (14.4%, typically asymptomatic), periprosthetic fracture (0.8%), glenoid loosening (0.7%), prosthetic dislocation (0.7%). Overall complication rate 8.9%, revision rate 2.5% at 5 years.
Subscapularis Failure (Anatomic TSA, 3–5%)
The most common serious complication of anatomic TSA. Presents as new or worsening anterior shoulder pain, progressive difficulty with internal rotation tasks (tucking in a shirt, fastening clothing, hygiene), a subjective "dead arm" or instability sensation with forward elevation, and positive belly-press, lift-off, or bear-hug testing.
Positive belly-press or lift-off test after Phase 1 is a same-day escalation trigger. Not monitoring. Not a note for the next visit. A call to the surgical team today.
The lift-off test has specificity of 96.9–100% for subscapularis tears. Early insufficiency detected promptly may be managed conservatively. Chronic insufficiency detected late requires revision surgery. Full subscapularis failure detection guide →
Aseptic Glenoid Loosening (Anatomic TSA, 2–5%)
Progressive radiolucency at the bone-implant interface without evidence of infection. Typically asymptomatic in early stages, detected on routine surveillance radiographs. Clinical presentation when symptomatic: progressively worsening pain with shoulder use, particularly loading activities (lifting, pushing), grinding or catching sensations with motion, tenderness over the anterior or posterior glenoid, and decreased active range of motion due to pain inhibition.
Any patient with a pattern of progressively worsening activity-related pain without a clear mechanical explanation after the initial recovery phase should be evaluated for glenoid loosening. Plain radiographs are the initial imaging modality. Request anteroposterior, axillary, and scapular Y views to assess for radiolucent lines, component migration, or eccentric humeral head positioning.
Prosthetic Dislocation (Higher in rTSA, 0.7–3%)
Posterior dislocation is the most common direction for reverse TSA due to the inverted biomechanics. Patients with metabolic syndrome (diabetes, hypertension, obesity) have significantly elevated risk: some studies report relative risks exceeding 2.0 compared to patients without metabolic syndrome.
Acute dislocation: Severe pain, inability to move the shoulder, visible deformity, palpable displacement of the humeral head. Emergency department referral, same session. Do not attempt reduction in an outpatient or home health setting.
Microinstability / chronic subluxation: Recurrent clicking or catching, sense of the shoulder "slipping," apprehension with specific positions (particularly combined adduction, internal rotation, and extension in rTSA). Physical examination may reveal abnormal glenohumeral translation or apprehension signs. Refer to surgical team for evaluation.
The 30-day readmission rate after reverse TSA is 3.63%, with prosthetic dislocation and infection as the leading causes. Both are detectable before they become emergencies. Reviewing dislocation precautions at every early session is not redundant. It's the precaution that prevents the most acute and alarming presentation on this list.
Periprosthetic Joint Infection (Both Procedures, 1–2%)
One of the most catastrophic complications. Associated with prolonged morbidity, multiple surgical procedures, and compromised outcomes even with successful treatment. Patients with diabetes, obesity, inflammatory arthritis, immunosuppression, prior shoulder surgery, and prolonged operative time are at highest risk.
Acute infection (first 4–6 weeks): Fever, wound drainage, erythema, warmth, and progressive pain that is worsening rather than improving.
Delayed or chronic infection: Persistent pain, stiffness, and functional limitation months to years after surgery, often without obvious signs of acute inflammation. Serum inflammatory markers (CRP, ESR) may be normal or only mildly elevated in chronic low-grade infection, limiting sensitivity. The clinical picture matters as much as the labs.
Persistent pain beyond 6 months postoperatively is not normal variation. It is a reason for diagnostic evaluation. Do not continue conservative management indefinitely when pain is not following the expected improvement trajectory.
When to Escalate: The Complete Trigger List
Same-day surgical team communication is required for: fever or systemic signs of infection at any point; wound drainage or erythema that is worsening rather than resolving after the first 2 weeks; pain that is increasing rather than decreasing beyond week 1; positive belly-press or lift-off test after Phase 1; acute loss of previously achieved motion or strength; any instability, deformity, or "slipping" report; and persistent pain beyond 6 months without an established cause.
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The Bottom Line
The overall total shoulder arthroplasty complications rate is 8.9–12.5%, but most complications are manageable when caught before they compound. The rehabilitation clinician who performs systematic assessment at every session, knows the specific early presentations of each major complication, and escalates immediately rather than monitoring conservatively is providing a clinical function that directly affects whether their patient has a good outcome or a revision surgery.
← Full TSA rehabilitation guide | Subscapularis failure in detail → | High-risk population modifications →
FAQs
What are the most common complications after total shoulder arthroplasty?
For anatomic TSA: subscapularis failure (3.1%), glenoid loosening (2.5%), infection (1.3%), instability (1.2%). Overall complication rate 10.7%, revision rate 5.6%. For reverse TSA: scapular notching (14.4%, usually asymptomatic), periprosthetic fracture (0.8%), glenoid loosening (0.7%), dislocation (0.7%). Overall complication rate 8.9%, revision rate 2.5%.
What are the warning signs of infection after shoulder replacement?
Acute infection (first 4–6 weeks): fever, wound drainage, erythema, warmth, progressive pain worsening rather than improving. Chronic or delayed infection: persistent pain, stiffness, and functional limitation months to years post-surgery without obvious inflammatory signs. Any patient with these findings warrants same-day surgical team referral. Do not advise monitoring for more than 24 hours.
How do I know if my patient has a dislocated shoulder replacement?
Acute dislocation presents with severe pain, visible deformity, inability to move the shoulder, and palpable displacement. This is an emergency department referral immediately. Microinstability presents more subtly as clicking, catching, or apprehension with specific positions (for rTSA: combined adduction, internal rotation, and extension). Both presentations require surgical team communication. The acute presentation requires emergency evaluation.
When is persistent pain after shoulder replacement a sign of a complication?
Pain that is increasing rather than decreasing beyond week 1, pain that plateaus at an unacceptable level and fails to improve after month 3, or pain that recurs after a period of improvement all warrant investigation. Persistent pain beyond 6 months postoperatively (particularly with functional loss) is not normal variation. It requires diagnostic evaluation, not continued conservative management.
What should I document when I suspect a TSA complication?
Document the specific finding objectively: which test was performed and what it showed, the pain trajectory (improving, plateauing, or worsening), wound appearance with specific descriptors (size of erythema, presence or absence of drainage), range of motion compared to the previous visit, and any patient-reported symptoms (instability, catching, constitutional symptoms). The surgical team needs clinical data, not a general concern.
