Distal-triceps pain is usually provoked by resisted elbow extension and pressing. Olecranon bursitis more often produces visible or palpable swelling directly over the tip of the elbow. Posterior joint pain is more likely to be associated with terminal extension or mechanical symptoms. Because these conditions can coexist, the location and behavior of the symptoms matter.
When posterior elbow swelling may be infectious
Tenderness
88% vs 36%
septic vs aseptic
Erythema / cellulitis
83% vs 27%
septic vs aseptic
Warmth
84% vs 56%
septic vs aseptic
Fever
38% vs 0%
septic vs aseptic
PMID 26577126
These findings overlap. No single examination sign can definitively classify septic versus aseptic bursitis.
The structures at the back of the elbow
Several structures sit within a few centimeters of each other:
- Distal triceps tendon: attaches to the olecranon and straightens the elbow.
- Olecranon bursa: a thin, fluid-filled sac that lies superficial to the olecranon, just under the skin at the tip of the elbow.
- Olecranon: the bony point of the ulna, which can develop stress injury in throwing athletes.
- Posterior joint: where the olecranon meets the back of the humerus in full extension.
- Ulnar nerve: runs behind the inner side of the elbow in the cubital tunnel.
Pain from any of these can be described as "the back of my elbow," which is why location has to be pinned down precisely.
Triceps tendon pain
Distal-triceps tendinopathy is a load-related tendon problem. Pain sits at or just above the olecranon insertion and is reproduced by resisted elbow extension, pressing, push-ups and dips. There is usually no marked swelling over the tip of the elbow. A tear is different: after a traumatic or heavy eccentric event, swelling, bruising and weakness raise concern for structural injury, and active extension can still be possible with a partial tear. See triceps tendinopathy vs. partial tear.
Olecranon bursitis
Olecranon bursitis is primarily a swelling disorder of the superficial bursa over the tip of the elbow, whereas triceps tendon pain is more strongly linked to resisted extension and tendon loading.
A systematic overview describes olecranon bursitis as a common condition in which the bursal cavity superficial to the olecranon becomes inflamed, with or without infection, often after repeated minor pressure or trauma (Blackwell, 2014). A 2016 review noted that the olecranon bursa is one of the most frequently affected bursae in the body and that bursitis there can be acute or chronic, septic or aseptic (Reilly, 2016).
Typical features include swelling over the tip of the elbow, sometimes soft and fluctuant, with variable tenderness, redness, warmth and pain. Resisted extension may be uncomfortable because of pressure on the swollen bursa, which is one reason the two problems can be confused.
Septic or aseptic?
Redness, warmth, marked tenderness and fever increase concern for septic bursitis, but no single physical finding reliably separates septic from aseptic bursitis.
The 2016 review compiled reported physical findings. Tenderness was present in 88% of septic and 36% of aseptic cases, erythema or cellulitis in 83% and 27%, warmth in 84% and 56%, and fever in 38% and 0%. A report of trauma or a skin lesion was present in 50% and 25%. The authors concluded that distinguishing septic from aseptic bursitis can be difficult because both physical and laboratory findings overlap (Reilly, 2016).
The practical message: a hot, red, very tender elbow raises concern for infection, but a cooler-looking elbow does not rule it out, and fever is absent in most septic cases.
Red flags for medical evaluation
Seek prompt medical assessment for posterior elbow swelling with:
- Fever or feeling unwell
- Spreading redness
- Significant warmth
- Drainage of pus
- A cut, puncture or abrasion over the elbow
- Diabetes, immune suppression or other reasons for reduced resistance to infection
- Any other concern for infection
Suspected septic bursitis is not treated with shockwave, manual therapy or routine soft-tissue care. It needs a medical pathway.
Managing uncomplicated aseptic bursitis
Uncomplicated aseptic bursitis is often managed conservatively, while suspected infection requires a medical pathway. A 2021 review described nonseptic olecranon bursitis as often self-limited and responsive to conservative measures such as rest, ice, compression, an orthosis or padding, and anti-inflammatory medication where medically appropriate. It also noted that more recent studies have reported adverse effects from intrabursal injection and surgery compared with noninvasive management as first-line care (Nchinda, 2021). Medication decisions belong with your physician.
The systematic overview also observed that, although many treatments are described, no single standardized, evidence-based pathway has been established (Blackwell, 2014).
Living with an aseptic bursa
Day-to-day habits matter with uncomplicated bursitis. Leaning on the elbow, resting it on hard desks or armrests and repeated pressure during work or sport can keep the bursa irritated. Padding, compression and avoiding direct pressure are simple measures consistent with the conservative approach described in the review literature. Any change toward redness, warmth, increasing pain, drainage or fever is a reason to seek medical care promptly rather than continuing self-management.
Posterior joint problems and impingement
Pain that is primarily reproduced at terminal extension, especially in an overhead athlete, raises a different differential from load-related triceps tendon pain.
A review of posterior elbow problems in overhead athletes highlighted posteromedial impingement, proximal ulnar stress fractures and triceps pathology as the most common posterior-side conditions in this group (van den Bekerom, 2014). Clues to a joint problem include pain at the end of extension, throwing or overhead activity, pain localized to the joint line and mechanical symptoms such as catching or locking.
Olecranon stress injury
Repetitive extension in throwing athletes can stress the olecranon itself. Focal bone tenderness, deep posterior pain that persists and symptoms that do not behave like tendon pain call for bone assessment rather than more tendon loading.
Ulnar nerve symptoms
The ulnar nerve passes behind the inner side of the elbow. Tingling or numbness into the ring and small fingers, hand weakness or symptoms brought on by keeping the elbow bent for long periods point toward the nerve. A 2017 systematic review also noted that snapping triceps, a separate condition, can be associated with ulnar nerve subluxation and symptoms, and that dynamic ultrasound helps distinguish the two (Shuttlewood, 2017). Neurologic symptoms are not triceps tendinopathy.
Referred pain
Arm symptoms with neck pain, numbness, reflex change or weakness may originate in the cervical spine.
When problems coexist
These conditions are not mutually exclusive. A fall onto the back of the elbow can inflame the bursa and injure the tendon at the same time. Bursal swelling can make resisted extension uncomfortable even when the tendon is healthy. One review lists olecranon bursitis, along with local steroid injection, anabolic steroid use and hyperparathyroidism, among the risk factors for distal triceps rupture (Yeh, 2010). When more than one structure may be involved, imaging is more likely to be helpful.
How the examination separates them
| Source | Where it hurts | What provokes it | Other clues |
|---|---|---|---|
| Triceps tendon | At or just above the olecranon | Resisted extension, pressing | Little swelling unless torn |
| Olecranon bursa | Tip of the elbow | Direct pressure, leaning | Visible swelling; redness or warmth if infected |
| Posterior joint | Joint line | Terminal extension, throwing | Catching or locking |
| Olecranon bone | Focal bone point | Repetitive throwing | Persistent deep pain |
| Ulnar nerve | Inner back of elbow | Prolonged bending | Ring and small finger tingling |
These patterns overlap, and more than one problem can be present.
When imaging helps
Ultrasound can show bursal fluid, the triceps tendon and its insertion in real time, and a 2025 review described its use for triceps tendinopathy, partial and complete tears, calcification and avulsion from the olecranon (Manske, 2025). MRI gives a broader view when a tear, joint pathology or bone stress injury is suspected. Imaging is used when the answer would change management.
What to expect at a first visit
The visit starts with how and when the pain began, whether there was a fall, a blow or a heavy lift, and whether there has been fever, redness or drainage. The elbow is inspected for swelling, bruising and contour, then the bursa, tendon insertion, olecranon and joint line are palpated separately. Resisted extension is tested on both sides, end-range extension is checked for pain, and the ulnar nerve and neck are screened. If infection is a concern, the next step is medical care rather than treatment in our clinic.
How Novo approaches posterior elbow pain
We look first for signs of infection, then localize the pain, examine the bursa, tendon, bone and joint, test resisted extension side to side and screen the ulnar nerve and neck. Suspected infection and suspected tendon rupture are referred promptly. See how we approach triceps tendinopathy and posterior elbow pain, and how shockwave fits for selected chronic tendinopathy.
References
- Reilly D, Kamineni S. Olecranon bursitis. Journal of Shoulder and Elbow Surgery. 2016;25(1):158-167. PMID 26577126. (link)
- Blackwell JR, Hay BA, Bolt AM, Hay SM. Olecranon bursitis: a systematic overview. Shoulder & Elbow. 2014;6(3):182-190. PMID 27582935. (link)
- Nchinda NN, Wolf JM. Clinical management of olecranon bursitis: a review. Journal of Hand Surgery (American Volume). 2021;46(6):501-506. PMID 33840568. (link)
- van den Bekerom MP, Eygendaal D. Posterior elbow problems in the overhead athlete. Sports Medicine and Arthroscopy Review. 2014;22(3):183-187. PMID 25077748. (link)
- Shuttlewood K, Beazley J, Smith CD. Distal triceps injuries (including snapping triceps): a systematic review of the literature. World Journal of Orthopedics. 2017;8(6):507-513. PMID 28660143. (link)
- Manske RC, Wolfe C, Page P, Voight M. Diagnostic musculoskeletal ultrasound in the evaluation of the triceps tendon. International Journal of Sports Physical Therapy. 2025;20(6):911-917. PMID 40469652. (link)
