Hand and Finger Imaging Articles

Reading a Hand or Finger Report Bone by Bone

A hand radiograph is read outward from the wrist: the five metacarpals form the palm's framework, and each finger continues as a proximal, middle, and distal phalanx (the thumb skips the middle phalanx and has only two). A report usually names the exact bone and its zone — base, shaft, neck, or head — because treatment for a metacarpal neck fracture is very different from treatment for a fracture through the base of the same bone.

Alignment gets checked at three hinge points per finger: the metacarpophalangeal (MCP) joint at the knuckle, the proximal interphalangeal (PIP) joint in the middle of the finger, and the distal interphalangeal (DIP) joint near the nail. Each joint is judged on whether the joint space is even, whether the bones sit centered on each other, and whether the finger points straight when compared to its neighbors rather than drifting sideways or twisting around its own axis.

On the palm side of each PIP joint sits the volar plate, a thick fibrous pad that stops the finger from bending backward. A small chip of bone pulled off its attachment — a volar plate avulsion — is one of the most common findings on a “jammed finger” X-ray, and it changes how long the joint needs protective buddy-taping. Either side of every finger joint runs a collateral ligament pair that resists side-to-side stress; on the thumb, the ulnar collateral ligament (UCL) at the base of the thumb gets special attention because a torn UCL can fold in on itself behind a nearby tendon, a pattern radiologists call a Stener lesion, and a Stener lesion almost never heals without surgery.

Tendon anatomy dominates the rest of the read. Flexor tendons run along the palm side of each finger through a series of fibrous annular pulleys that keep the tendon hugging the bone instead of bowstringing away from it when you grip; extensor tendons run along the back of the finger and thin into a delicate hood over each joint that is easy to disrupt with even a minor cut or jam. In an arthritic hand, the small joints of the fingers and thumb base are graded individually rather than as one summary score, because osteoarthritis of the thumb basal joint and rheumatoid involvement of the knuckles progress and get treated on completely separate tracks.

The Vocabulary of Finger Injuries

An “avulsion fracture” means a ligament or tendon yanked a fleck of bone away from the main shaft rather than the bone itself snapping across; you will see this language attached to the volar plate, the thumb UCL, and the terminal extensor tendon at the fingertip. “Rotational deformity” describes a finger that twists along its own long axis so it crosses over or under its neighbor when the hand is closed into a fist — a subtle finding on a flat X-ray that clinical exam catches far more reliably. A “mallet injury” is the fingertip drooping because the terminal extensor tendon has torn or pulled a bone fragment loose, leaving the last joint unable to straighten on its own; it is treated with continuous splinting, not surgery, in most cases. Learning these four terms — avulsion, rotation, Stener, mallet — covers most of the vocabulary you will meet across a stack of hand and finger reports.

Healing Timelines and Why Stiffness Is the Real Enemy

Most stable finger fractures form enough bridging callus to allow protected motion within three to four weeks and are considered solidly healed by six to eight weeks; a repaired flexor or extensor tendon needs a similar six-to-eight-week window before it can tolerate unrestricted load, though early protected motion within that window is exactly what keeps it from healing stuck to the surrounding sheath. The single biggest complication across almost every hand injury is not nonunion or infection — it is stiffness. Finger joints scar down quickly, and a joint immobilized for even a few extra weeks can lose range of motion that takes months of dedicated therapy to win back, which is why hand surgeons push toward the earliest motion a given injury can safely tolerate.

What Hand Therapy Actually Works On

After a finger fracture, a certified hand therapist typically starts with edema control and gentle protected motion in a custom thermoplastic splint, then progresses to active range of motion and finally grip and pinch strengthening once the bone is stable enough to load. After a flexor or extensor tendon repair, therapy follows a carefully staged protocol — often combining passive motion with a dorsal blocking splint in the earliest weeks before active motion is introduced — because loading the repair too soon can rupture it, while loading it too little lets scar tissue glue the tendon to its sheath. After a trigger finger release, therapy focuses on restoring full, catch-free glide of the flexor tendon through the released pulley and on desensitizing the small surgical scar so pinch and grip return to normal quickly.

Choosing Between X-ray Views, a Small-Coil MRI, and CT

A standard hand series — posteroanterior, oblique, and lateral views — answers most fracture and alignment questions immediately and cheaply, and the oblique view in particular is what uncovers subtle rotational or angulated fractures that a single straight-on view can hide. When a ligament, pulley, or tendon needs a closer look, MRI performed with a small dedicated extremity coil placed directly around the hand delivers far sharper detail than a body-coil scan would, which matters enormously when the structure in question is only a few millimeters wide. CT is reserved for questions X-ray and MRI cannot settle on their own: mapping a complex, multi-fragment intra-articular fracture in three dimensions before surgery, or confirming whether a small carpal or metacarpal fracture line has truly healed when the X-ray appearance stays ambiguous.