Scaphoid X-Ray Positioning: 4 Views with Centering Points
Why the Scaphoid Needs Its Own Views
The scaphoid (from the Greek skaphos, "boat") is the largest of the eight carpal bones, sitting at the radial wrist between the radius, lunate, trapezium, and trapezoid. It is also the most commonly fractured carpal bone — scaphoid fractures account for 2–7% of all fractures and 60–70% of all carpal bone fractures (StatPearls), and they happen most often in younger, active people after a fall onto an outstretched hand in forced hyperextension and radial deviation.
Here is the problem every radiologic technologist should know cold: up to about 25% of scaphoid fractures are invisible on the initial radiograph and are frequently mistaken for a simple "wrist sprain." The reason is geometric. In a routine PA wrist view, the scaphoid lies foreshortened and overlapped by the lunate, trapezium, and trapezoid, so a subtle waist fracture can hide. That is exactly why departments use dedicated scaphoid views — projections that elongate the bone and project it clear of the overlapping carpals.
Registry Review
ARRT's published Radiography Content Specifications cover upper-extremity positioning (hand, wrist, forearm, elbow) as a tested content area, but they do not promise a question count for the scaphoid specifically. The high-yield facts to know: the scaphoid is the most commonly fractured carpal bone, its waist (~65%) is the most-common fracture site, its retrograde blood supply puts a waist or proximal-pole fracture at risk of avascular necrosis, and the Stecher PA axial and ulnar-deviation views are used to elongate the bone and unfold the fracture line.
This guide is the dedicated complement to our general upper-extremity coverage: see Hand, Wrist & Finger X-Ray Positioning, Forearm X-Ray Positioning, and the X-Ray modality page for the routine series and review that should always come first. It also pairs well with Trauma Radiography: Positioning and Protocols, since snuffbox pain after a fall is a classic trauma presentation.
The Anatomy That Drives the Views
The scaphoid has a proximal pole, a distal pole, and a narrow waist between them. Its blood supply is unusual — and clinically critical:
- The dorsal carpal branch of the radial artery enters the dorsal ridge and supplies roughly 80% of the proximal pole via retrograde (backward) flow.
- A second supply from the superficial palmar arch (volar radial artery) enters the distal tubercle and feeds the distal pole.
- Because the proximal pole is fed retrograde from distal vessels, a fracture across the waist interrupts that blood supply — leaving the proximal pole at high risk of avascular necrosis (AVN).
This is why the fracture site matters so much. Roughly 65% of scaphoid fractures occur at the waist, about 25% at the proximal third, and 10% at the distal third. AVN risk tracks the location — it is essentially universal for proximal-segment fractures and drops to about 33% for distal-third fractures (StatPearls, 2023). Undisplaced waist fractures left untreated can go on to non-union, which is reported in about 14–50% of displaced fractures.
Clinical Pearl: The Snuffbox Sign
Pain and swelling at the base of the thumb in the anatomic snuffbox is the classic finding for a waist scaphoid fracture. Tenderness that reproduces on ulnar deviation of the wrist is a strong hint. A patient with snuffbox tenderness after a fall on an outstretched hand is sent down the scaphoid pathway — even when the first film looks normal — because of the occult-fracture rate.
The Scaphoid Imaging Pathway
Here is how the scaphoid series actually fits into clinical practice (StatPearls):
| Step | Finding | Action |
|---|---|---|
| 1 | Initial clinical suspicion | PA + lateral wrist plus scaphoid views (wrist in ~30° extension and 20° ulnar deviation) |
| 2 | Negative initial films + high suspicion | Immobilize 7–14 days, then repeat plain radiographs |
| 3 | Need early confirmation | Bone scintigraphy at ~72 hours post-injury may reveal an occult fracture |
| 4 | Negative repeat films + persistent suspicion | MRI (most sensitive) or CT to confirm or exclude an occult fracture |
The Four Core Scaphoid Views
The dedicated scaphoid series almost always includes these four projections:
| View | Position / CR | Key Purpose |
|---|---|---|
| PA wrist | Palm down; CR perpendicular to scaphoid | Baseline overview of carpals and DRUJ |
| PA ulnar deviation (scaphoid) | Palm down, thumb abducted, hand ulnarly deviated; CR perpendicular to scaphoid (optional 10–15° distal); min SID 40 in | Elongates the scaphoid out of carpal overlap |
| PA axial (Stecher) | IR/wrist elevated 20°, OR CR ~20° cephalic, OR clenched fist; CR to scaphoid | Profiles the scaphoid at right angles to the CR |
| Lateral oblique (45°) | Rotated ~45° laterally from prone; ulnar deviate for scaphoid; CR perpendicular | Shows the scaphoid + trapezium; a second look at the fracture line |
View 1 — PA Wrist (Baseline)
The routine PA wrist is always the starting point — do not jump straight to the special views.
- Patient: seated sideways at the end of the table; arm on the table, elbow bent, forearm resting flat (ideally upper arm, elbow, and forearm all on the table).
- Part: wrist prone (palm down), fingers flexed loosely.
- Central ray: perpendicular to the image receptor, centered at the wrist.
- Structures shown: the carpals, distal radius and ulna, and proximal metacarpals.
View 2 — PA Ulnar Deviation (the "Scaphoid" View)
This is the classic elongating view for the scaphoid.
- Purpose: demonstrate the scaphoid and its adjacent articulations and open the interspaces on the radial side of the wrist so the scaphoid is seen without foreshortening or overlap.
- Part: palm down, thumb slightly abducted, then ulnar deviate the hand (turn it toward the ulnar side). Do not force ulnar deviation on a severe injury — this view follows, and should not replace, the routine films.
- Central ray: perpendicular to the IR, centered to the scaphoid — located about 2 cm (3/4 in) distal and medial to the radial styloid process. An optional 10–15° angulation distally can sharpen the delineation.
- Minimum SID: 40 inches (100 cm). Collimate to the carpal region on all four sides.
- Evaluation: the scaphoid shows along its long axis without foreshortening; adjacent carpal interspaces open on the radial side; no wrist rotation (distal radius/ulna minimally superimposed at the distal radioulnar joint); sharp trabecular detail with no motion.
The Rafert–Long Method Variation
For a more thorough fracture hunt, the Rafert–Long method fires a small series of four PA exposures at 0°, 10°, 20°, and 30° cephalad CR angles. Angling the beam through this range profiles the scaphoid from several projection angles and often reveals a hairline fracture a single perpendicular view would miss.
View 3 — PA Axial Scaphoid (Stecher and Bridgman Methods)
The Stecher method — with the Bridgman modification — is one of the most heavily tested scaphoid techniques on the ARRT exam.
- IR: 8 × 10 in (18 × 24 cm) placed lengthwise.
- Patient: seated at the end of the table with the arm and axilla against the table; forearm resting on the table.
- Shield the gonads (lead apron/lead placement over the lap).
The goal is to place the scaphoid at right angles to the central ray so it projects without self-superimposition. Stecher described three variations (any may be used):
- Stecher I — elevate the IR/wrist 20°. Place one end of the IR on a support so the finger end is elevated 20°; position the wrist PA on the angled IR and center the scaphoid to the IR. CR perpendicular (to the table), centered to the scaphoid.
- Stecher II — keep the IR flat and angle the CR. Position the wrist PA on a flat IR and angle the central ray approximately 20° cephalic (toward the elbow). CR centered to the scaphoid.
- Stecher III — have the patient make a fist. Clenching the fist elevates the distal scaphoid so it lies more parallel to the IR; no CR angulation. CR perpendicular, centered to the scaphoid. A bonus clinical effect: fist clenching can widen the fracture line, making a subtle waist fracture easier to see.
The Bridgman method adds ulnar deviation to the hand-elevation technique, which reduces scaphoid superimposition further. To demonstrate a fracture line that runs superoinferiorly, the positions may be reversed — angle the wrist inferiorly, or angle the CR toward the digits, instead of cephalad.
ARRT Exam Tip: The Three Stecher Variations
The exam often tests the concept, not the arithmetic. Remember that all three Stecher variations achieve the same goal — elongate the scaphoid and project it free of self-superimposition — by either elevating the wrist 20°, angling the central ray ~20° cephalic, or having the patient clench a fist. The recurring question stem is why do it at all: because the scaphoid is foreshortened and overlapped by other carpals in a routine PA, and a waist fracture (with its AVN risk from retrograde blood supply) can otherwise be missed.
View 4 — Lateral Oblique (Scaphoid-Selected Oblique)
The PA oblique with lateral rotation gives a second look at the scaphoid and the radial carpals.
- Purpose: demonstrate the scaphoid and trapezium (the lateral carpals) and surrounding soft tissue.
- Part: rest the wrist over the IR; from the prone (palm-down) position, rotate the wrist laterally approximately 45°. When the scaphoid is the focus, ulnar deviate the wrist. Support the wrist with a translucent wedge if needed.
- Central ray: perpendicular to the IR, centered on the wrist.
Technique, Shielding, and Practical Tips
- Tabletop technique is common; use a detail screen (or lead masking on a DR receptor) to reduce scatter reaching the edges of the IR.
- Tight collimation to the carpal region — an image-quality and ALARA win on a small, high-contrast structure.
- Nail the geometry: scaphoid views are about angulation. If the wrist is rotated or not truly ulnarly deviated, the scaphoid foreshortens and the study loses its diagnostic value — the very reason the dedicated series exists.
- Patient comfort: ulnar deviation on an acutely injured wrist can hurt. Go gently, use a wedge for support, and keep the position brief. If it's truly contraindicated (suspected distal-forearm or wrist fracture), perform and have the routine series read first.
- Evaluation check: confirm the scaphoid is shown without self-superimposition, the DRUJ is not rotated, and bony trabeculation is sharp before the patient leaves — repeat any view that didn't clear the carpal overlap.
Frequently Asked Questions
Why is the scaphoid so hard to see on a routine X-ray?
The scaphoid lies in an oblique, foreshortened plane and is overlapped by the lunate, trapezium, and trapezoid in a standard PA wrist view. Without elongation, a subtle waist fracture can be hidden; this is why up to about a quarter of scaphoid fractures are missed on the first film.
What is the Stecher method for the scaphoid?
The Stecher method is a PA axial projection used to profile the scaphoid without self-superimposition. It has three variations: elevate the finger end of the image receptor 20° (Stecher I), angle the central ray about 20° cephalic with the IR flat (Stecher II), or have the patient make a fist to lift the distal scaphoid parallel to the IR (Stecher III).
Why is ulnar deviation used for the scaphoid view?
Ulnar deviation rotates the hand toward the ulnar side, which elongates the scaphoid out from under the overlapping carpals and opens the adjacent interspaces on the radial side of the wrist. The scaphoid is then projected along its long axis so a fracture line is easier to see.
Which carpal bone is most often fractured?
The scaphoid is the most commonly fractured carpal bone, accounting for roughly 60–70% of carpal bone fractures. Most fractures occur at the waist (~65%), and the proximal pole is at high risk of avascular necrosis because of the bone's retrograde blood supply.
What is the minimum SID for the scaphoid series?
The minimum source-to-image distance is 40 inches (100 cm), with the central ray centered to the scaphoid, located about 2 cm distal and medial to the radial styloid process.
How is a suspected scaphoid fracture followed up when the first X-ray is normal?
The wrist is immobilized for 7–14 days and plain radiographs are repeated. If suspicion persists, bone scintigraphy (~72 hours), or MRI (the most sensitive), or CT is used to confirm or exclude an occult fracture.