Pain:Olecranon

Overview

Pain localised to the posterior elbow and olecranon process has a clinically important range of causes spanning structural pathology and myofascial trigger points (TrPs). The olecranon is the insertion point of the triceps tendon, the site of the olecranon bursa, and the posterior articular surface of the ulnohumeral joint — all of which can independently produce pain at this location.

Critically, the olecranon is also a referred pain destination from a muscle most clinicians would not think to examine: the serratus posterior superior, a thin accessory respiratory muscle lying deep to the rhomboids and trapezius. Its spillover zone includes the olecranon accent, making it an important mimic when the elbow tip hurts but elbow loading is not the provocative factor.

Red flags — exclude before proceeding

• Fluctuant swelling over the olecranon tip — olecranon bursitis; if accompanied by fever, erythema, or warmth, septic bursitis must be excluded urgently by aspiration and culture
• Loss of active elbow extension, or palpable gap in the triceps tendon — distal triceps rupture; urgent orthopaedic evaluation; modified Campbell Thompson test; flake sign on plain film
• Pain only at terminal extension with hard end-feel, comfortable mid-range — elbow osteoarthritis with bony impingement; radiograph and CT for planning
• Young throwing athlete with focal olecranon tenderness — olecranon stress fracture; X-ray then MRI if negative
• Fever, warmth, or erythema — septic bursitis or septic arthritis; emergency evaluation

Structural differential

Diagnosis	Key distinguishing features	Workup
Olecranon bursitis	Fluctuant swelling at olecranon tip; may be painless (aseptic) or painful with erythema/fever (septic); ROM preserved; TrP4 tenderness is deep to the aponeurosis with no effusion	Aspiration + culture if septic features; ultrasound; MRI to exclude osteomyelitis or septic arthritis
Distal triceps rupture	Loss of active extension; palpable defect; flake sign on X-ray; positive modified Campbell Thompson test; eccentric-load mechanism; most common in males	X-ray; MRI; CT for avulsion fragments
Elbow osteoarthritis	Pain only at terminal extension or maximum flexion; mid-range comfortable; stiffness; osteophytes and loose bodies on X-ray; may cause ulnar neuropathy	X-ray; CT for preoperative planning
C8–T1 radiculopathy	Objective deficit required: motor weakness, reflex change, dermatomal sensory loss, positive Spurling's; serratus posterior superior refers numbness without neurological deficit	Cervical MRI; EMG/NCS

Structural differential adapted from: Chung HJ et al. Differential Diagnosis of Elbow Pain. PMC12093526 (2025).

Myofascial sources — scoring algorithm

If structural causes have been excluded and soft tissue pain with preserved elbow ROM and extension strength is present, use the algorithm below.

The algorithm asks five questions designed to accomplish two things in sequence:

1. Confirm that the presentation is consistent with a TrP source (versus structural pathology)
2. Differentiate between the two muscles most likely to refer to the olecranon

Note on the triceps TrP: The olecranon tender point in triceps is an attachment TrP — it is almost always secondary to a central TrP somewhere in the triceps belly (usually the long, lateral, or deep medial head). If the algorithm points toward triceps, the treatment goal is to locate and release the responsible central TrP, not to treat the olecranon tenderness in isolation. See Muscle:Triceps_Brachii for the full TrP map.

TrP sources in this algorithm

• Muscle:Triceps_Brachii — the distal attachment area, just above the olecranon, develops an attachment TrP secondary to central TrPs in the long, lateral, or deep medial head. The olecranon pain is focal and worsened by resisted elbow extension (pushing). Treat the central TrP first; the attachment tenderness typically resolves.

• Muscle:Serratus_Posterior (serratus posterior superior) — refers a wide arc of pain from deep under the scapula, through the posterior deltoid and triceps region, with an accent at the olecranon, continuing into the ulnar forearm and 5th digit. The olecranon component is part of this larger pattern. Respiratory overload (chronic cough, paradoxical breathing) and sustained overhead or reaching postures are the primary activators. The scapula must be fully abducted to palpate the attachment TrPs — they are inaccessible in the resting position.

Satellite and treatment hierarchy

• Serratus posterior superior TrPs can generate satellite TrPs in the triceps — if serratus posterior superior is identified as the primary source, treat it first; triceps TrPs may resolve as satellites. See also Muscle:Scalene, which can drive serratus posterior superior TrPs in the reverse direction.
• Muscle:Latissimus_Dorsi and serratus posterior superior are both listed as key TrP sources for satellite triceps TrPs — always consider these when triceps TrPs recur after treatment.

See also

• Pain:Back_of_Arm — posterior upper arm
• Pain:Back_of_Shoulder — posterior shoulder girdle; teres minor, deltoid
• Pain:Medial_Epicondyle — triceps medial head (TrP5); flexor-pronator group
• Pain:Lateral_Epicondyle — triceps TrP2; supinator; forearm extensors
• Differential:ThoracicOutletSyndrome — serratus posterior superior differential
• Concept:Trigger_Point
• Concept:Apropos_Assessment
• Concept:Apropos_Treatment