Mid Term Revision Radiology Basic 0233 Dr Mohamed El Safwany, MD.

Medical Imaging Radiography Plain Film/ X-Ray/ Roentgen Rays Computed Tomography (CT Scan) DEXA Bone Scan Magnetic Resonance Image (MRI)

Basic Concepts What is an X-Ray? –Electromagnetic Radiation - short wavelength

Radiodensity X-rays not absorbed, screen produces photons when struck, and exposes the film, turning it dark When an object absorbs the X-rays - fewer protons produced, film stays light RadiopaqueRadiolucent

What do I need to look for in foot trauma? Distal tibia and fibula F- fifth metatarsal base L- lateral process of the talus O- os trigonum A- anterior process of the calcaneus T- talar dome

Viewing Images X-ray study named for the direction the beam travels –AP –PA –Lateral Orient film as if you were facing the patient, his/her Left will be on your Right

Viewing Images A radiograph is a two dimensional representation Therefore, “One View is No View” –Two views are needed, ideally at 90 degrees to one another for proper 3-D like interpretation

Computed Tomography (CT) X-Ray beam moves 360 around the patient Consecutive x-ray “slices” around the patient Computer can recreate 3D image of the body Best for evaluating bone and soft tissue tumors, fractures, intra-articular abnormalities, and bone mineral analysis

Magnetic Resonance Imaging (MRI) What is a MRI? The use of a High Power Magnet ( Teslas) To align hydrogen atoms in the body to which a radio wave frequency is applied to produce an image

T1 Vs T2 T1 Tissue with high water content will apear dark (grey) T2 Tissue with high water content will appear white/ brighter

Shoulder - MRI – Coronal Plane Supraspinatus Rotator Cuff SS Tendon Fluid in Joint Glenoid Acr -- Clav

“A bone fracture is a medical condition in which there is a break in the continuity of the bone. A bone fracture can be the result of high force impact or stress, or trivial injury as a result of certain medical conditions that weaken the bones, such as osteoporosis, and bone cancer.”

* A fracture is a broken bone that depending upon physical pressure or stress that was exerted on the bone,it can be a large or small fracture. Symptoms of a fracture are: swelling, deformity, pain, and loss of function. Treatment for fracture is to get an x-ray, reduction, fixation, surgery, and rehabilitation.

There are several types of fractures such as closed, comminuted, compound, compression, fracture, greenstick, impacted, oblique, pathologic, spiral, stress, and transverse.

Skeletal Imaging Majority are diagnosed by plain radiograph AP and Lateral projections Oblique views for trauma involving joints, hands and feet CT - fine bone structure ( skull,spine and pelvis) MRI - evaluation of soft tissue Nuclear medicine - bone metastases, osteomyelitis and occult trauma (stress fractures)

Skeletal Imaging Most bone lesions are obvious on clinical history >95 % bone films are obtained for: –Evaluation of trauma –Eval. Arthritis –Eval. Degenerative conditions –Metastases

Strains May result in pathologic changes of the soft-tissue and bones:May result in pathologic changes of the soft-tissue and bones: –tendon degeneration, osteophytes, stress fractures, or nerve entrapment. also graded as mild, moderate or severe.also graded as mild, moderate or severe. Severe strains are characterized by rupture of any part of the tendon complex e.g biceps, patella or Achilles.Severe strains are characterized by rupture of any part of the tendon complex e.g biceps, patella or Achilles. Diagnosed by Ultrasound and MRI.Diagnosed by Ultrasound and MRI.

Fracture Description Fractures are further described based on:Fractures are further described based on: –Location –Pattern –Displacement When describing location,When describing location, –the bone affected is identified –as well as the specific part of the bone involved (proximal or distal epiphysis,etc.)

Clavicle fracture Most common bone fracturedMost common bone fractured Weakest aspect is the junction of middle/distal thirdsWeakest aspect is the junction of middle/distal thirds Look for “Tenting” of the skinLook for “Tenting” of the skin Class A (middle third fractures) (80%).Class A (middle third fractures) (80%). Class B (distal third fractures) (15%).Class B (distal third fractures) (15%). Class C (proximal third) (5%)Class C (proximal third) (5%)

The Wrist-Eight Carpal Bones Proximal / Distal row from radial to ulnar positionProximal / Distal row from radial to ulnar position Scaphoid,Lunate,Triquetrum,Pisiform, Trapezium,Trapezoid,Capitate,Hamate + Radius and Ulna

Scaphoid Fractures Most common fracture carpal boneMost common fracture carpal bone There is no direct blood supply to the proximal portion of the scaphoidThere is no direct blood supply to the proximal portion of the scaphoid Therefore, scaphoid fracture have a tendency to develop delayed union or avascular necrosisTherefore, scaphoid fracture have a tendency to develop delayed union or avascular necrosis Mechanism of injuryMechanism of injury –Forceful hyperextension of the wrist

Knee Standard Xray projections:Standard Xray projections: –AP – evaluate joint space narrowing / calcifications –Lateral –evaluates.Patella / effusions Special viewsSpecial views –Sunrise / merchant view Tangential / knee flexed/from top-downTangential / knee flexed/from top-down –Tunnel view Knee more flexed, looking through the “tunnel created by the femoral condylesKnee more flexed, looking through the “tunnel created by the femoral condyles

Meniscal Tear Most Common injury to the knee requiring surgeryMost Common injury to the knee requiring surgery Medial meniscal tears occur 3 times more frequently than lateral meniscal tearsMedial meniscal tears occur 3 times more frequently than lateral meniscal tears Locked knee requires urgent interventionLocked knee requires urgent intervention

Unhappy Triad This is the term given to an injury where the ACL, MCL and Medial Meniscus are all three torn.This is the term given to an injury where the ACL, MCL and Medial Meniscus are all three torn. The mechanism for this injury is usually a lateral blow to the knee with the foot fixed.The mechanism for this injury is usually a lateral blow to the knee with the foot fixed. 1. ACL tear1. ACL tear 2. MCL tear2. MCL tear 3. Medial meniscus tear3. Medial meniscus tear

Chronic Knee Pain Degenerative OADegenerative OA X ray findingsX ray findings –joint space narrowing (Medial common) –Spurs, osteophytes –Sclerotic bony margins

Artificial knee replacement

Hip dislocations From M V Accidents Most common posterior dislocation –On AP - head of femur located superiorly and laterally displaced Anterior dislocation: inferior and medial Look for associated fracture fragments from the acetabulum

Aseptic necrosis hips Xray changes Flattening, irregularity, sclerosis of superior aspect femoral head(late) Early findings on MRI/bone scan Caused by trauma and chronic steroid use

Slipped Capital Epiphysis

Good Luck