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Radius bone

The Top Women's Apparel to Your Door. Free UK Delivery on Eligible Orders Today The radius or radial bone is one of the two large bones of the forearm, the other being the ulna. It extends from the lateral side of the elbow to the thumb side of the wrist and runs parallel to the ulna. The ulna is usually slightly longer than the radius, but the radius is thicker. Therefore the radius is considered to be the larger of the two Radius The forearm contains two major bones. One is the ulna, and the other is the radius. In concert with each other, the two bones play a vital role in how the forearm rotates

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The radius is one of two forearm bones and is located on the thumb side. The part of the radius connected to the wrist joint is called the distal radius. When the radius breaks near the wrist, it is called a distal radius fracture. The break usually happens due to falling on an outstretched or flexed hand The radius bone goes from your elbow to your wrist. The radial head is at the top of the radius bone, just below your elbow. A fracture is a break in your bone. The most common cause of a radial head fracture is falling with an outstretched arm The radius is the larger of the two bones of the forearm. The end toward the wrist is called the distal end. A fracture of the distal radius occurs when the area of the radius near the wrist breaks. Distal radius fractures are very common The forearm consists of two bones, the radius and the ulna, with the ulna is located on the pinky side and the radius on your thumb side. Fractures of the forearm can occur at different levels: near the wrist at the farthest (distal) end of the bone, in the middle of the forearm or near the elbow at the top (proximal) end of the bone

It also could break the smaller bone (radius) in your forearm. Fractures of the radius often occur in the part of the bone near the elbow, called the radial head. Radial head fractures are common injuries, occurring in about 20% of all acute elbow injuries. Many elbow dislocations also involve fractures of the radial head The radius, also known as the radial bone, is one of the two forearm bones in the human body, with the other one being the ulna. It is instrumental in the shaping and use of hands. Where is the Radius Bone Located in the Arm It is located on the thumb side of the hand, lying laterally in the lower arm, parallel in reference to the ulna [1, 2] Radius, in anatomy, the outer of the two bones of the forearm when viewed with the palm facing forward. All land vertebrates have this bone. In humans it is shorter than the other bone of the forearm, the ulna. bones of the human forearm shown in supinatio

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The radius is a long thin bone that extends from the elbow to the thumb side of the wrist. The thumbs are present in individuals with TAR syndrome, a finding that distinguishes it from other disorders involving radii. The hands, fingers and thumbs are almost always unaffected, although the fingers may be abnormally short 14,213 radius bone stock photos, vectors, and illustrations are available royalty-free. See radius bone stock video clips. of 143. forearm ulna ulna bone radius ulna fractured shoulder bones of shoulder anatomy of the shoulder bones shoulder arms bone orthopedics shoulder human skeleton parts. Try these curated collections The radius (plural: radii ) is one of the two long bones present in the forearm , located laterally in the supinated anatomical position. It has a smaller proximal end and enlarges to a larger distal end (opposite to the ulna ). On this page: Article: Gross anatomy. Variant anatomy. Related pathology. Related articles What are the parts of radius? Like any other long bone radius also has an upper end, shaft and lower end. Upper end: consists of head, neck and radial tuberosity. Shaft: h as 3 borders ( anterior, posterior and interosseous) and 3 surfaces (anterior, lateral and posterior The wrist is a complicated joint, and there are several potential ways its bones can be fractured or displaced. The most common type of fracture is a break of the radius bone, a long forearm bone. This is known as a distal radius fracture

The radius is the larger of the two bones in the area while the end portion towards the wrist is referred to as the distal end. Therefore, when the radius bone close to the wrist breaks its diagnosed as a distal radius fracture. Signs and Symptoms of A Distal Radius Fractur The nutrient foramen of the Radius is present on the anterior surface of the proximal radius and exits the bone towards its distal end. Ulnar Notch. On the distal part of the radius is the articular hollow which is concave in shape. The distal end of the ulna articulates with the distal radius at this concave ulnar notch The wrist is made up of eight small bones which connect with the two long forearm bones called the radius and ulna. Although a broken wrist can happen in any of these 10 bones, by far the most common bone to break is the radius. This is called a distal radius fracture by hand surgeons (Figure 1) radius fracture. These keep the bones in place while they heal. Sometimes wires are also used. • Right after surgery, most patients have their arm wrapped in a bulky . dressing (bandage) and a plaster splint that goes from the hand to the middle of the forearm, with the fingers free. This splin A broken wrist—specifically a distal radius fracture—is one of the most commonly experienced fractures in the body. Studies have shown that it accounts for up to 25% of fractures in children and about 20% of fractures in older adults. 1 See Guide to Wrist Anatomy. The wrist is a complicated joint, and there are several potential ways its bones can be fractured or displaced

Radius (bone) - Wikipedi

  1. A forearm fracture occurs when there is a fracture of one or both of the bones of the forearm. The two bones of the forearm are the radius and the ulna. Both bones are important for proper motion of the elbow and wrist joints, and both bones serve as important attachments to muscles of the upper extremity. 1 . The most common types of.
  2. Wrist bones. Your wrist is made up of eight small bones (carpal bones) plus two long bones in your forearm — the radius and the ulna. The most commonly injured carpal bone is the scaphoid bone, located near the base of your thumb
  3. Distal Radial Epiphysis Injury. A distal radial epiphysis injury is an injury to the growth plate at the wrist end of the radius bone in the forearm. It mostly affects young athletes and is most often caused by overuse. Resting and changing training accordingly can help, although activities that exacerbate wrist pain should be stopped
  4. If the view is in the plane of the bow, the bone may appear completely normal 1. The bowing tends to be fluid and blend into the normal bone at either end. There is no fracture line or visible cortical injury. There is usually an accompanying fracture of a paired bone, e.g. radius, and this is usually diaphyseal (either greenstick or complete )
  5. Kindle File Format Anatomy Of Radius Bone Anatomy and Physiology-J. Gordon Betts 2013-04-25 Joints & Ligaments- 2015 Morrey's The Elbow and Its Disorders E-Book-Bernard F. Morrey 2017-05-05 Revised to include the most up-to-date surgical techniques and their outcomes, Morrey's The Elbow and Its Disorders, 5th Edition, is an essential reference.
  6. radius bone is a curved shape after a fall, doctor says he won't do anything about treating it, it's causing me pain in the arm and i lose grip easily? Dr. Ralph Morgan Lewis answered. 38 years experience Family Medicine

The radius is the larger of the two bones of the forearm. The end toward the wrist is called the distal end. A fracture of the distal radius occurs when the area of the radius near the wrist breaks. Distal radius fractures are very common. In fact, the radius is the most commonly broken bone in the arm The radius or radial bone is one of the two large bones of the forearm, the other being the ulna.It extends from the lateral side of the elbow to the thumb side of the wrist and runs parallel to the ulna. The ulna is usually slightly longer than the radius, but the radius is thicker. Therefore the radius is considered to be the larger of the two

Fractures of Humerus, Radius/Ulna, Femur, and Tibia

The ulna (pl. ulnae or ulnas) is a long bone found in the forearm that stretches from the elbow to the smallest finger, and when in anatomical position, is found on the medial side of the forearm. It runs parallel to the radius, the other long bone in the forearm.The ulna is usually slightly longer than the radius, but the radius is thicker. Therefore, the radius is considered to be the larger. The most common mechanism of injury for a distal radius fracture is a fall on an outstretched hand, or FOOSH injury. This is also the direct mechanism of fracture of the scaphoid carpal bone. This fracture can be sometimes overlooked due to the more pressing displacement of the distal radius

The radius is just a little shorter than normal and the wrist turns in only slightly. Type II. The radius is much smaller than usual and the wrist is more turned in. Type III. A large part of the radius missing and there is more severe turning in of the wrist. The other bone of the forearm (the ulna) is curved and thickened. Type I Radius and ulnar shaft fractures, also known as adult both bone forearm fractures, are common fractures of the forearm caused by either direct trauma or indirect trauma (fall). Diagnosis is made by physical exam and plain orthogonal radiographs. Treatment is generally surgical open reduction and internal fixation with compression plating of. The primary mechanism of injury associated with radial and ulnar shaft fractures is a fall on an outstretched hand that transmits indirect force to the bones of the forearm. 3,66,167 Biomechanical studies have suggested that the junction of the middle and distal thirds of the radius and a substantial portion of the shaft of the ulna have an.

The forearm bones consist of the radius and ulna. In this anatomy lesson, I'll cover the basic anatomy of these two forearm bones, which are classified as lo.. The forearm (distal radius) has been identified as an important site of fracture, with a high likelihood of relevant attribution to risk from osteoporotic bone loss, particularly in elderly women. 1 Distal radius fractures also cause substantial expenditures (385 million US$/year) to the health care system, 2 and their age-related increase in. UD radius aBMD Z-scores tracked strongly over 6 years, regardless of pubertal stage (r=0.66-0.69; all p<0.05). Conclusion: UD radius aBMD Z-scores strongly associated with distal radius trabecular bone density, with marginal confounding by stature. These reference data may provide a valuable resource for bone health assessment in children The objectives of this study were to evaluate the capability of a novel ultrasound device to clinically estimate bone mineral density (BMD) at the 1/3 radius. The device rests on a desktop and is portable, and permits real-time evaluation of the radial BMD. The device measures two net time delay (NT

the carpal bones, the radius and ulna, the elbow and upper arm, and the shoulder and thoracic cage. The cervical spine and the thoracic and lumbosacral spine are covered in separate chapters, followed by the pelvis, the femur, the knee and lower leg, the ankle, the tarsal bones, and the metatarsals and toes Learn radius bone with free interactive flashcards. Choose from 500 different sets of radius bone flashcards on Quizlet Radius is a commercial biopharmaceutical company committed to serving patients with unmet medical needs in endocrinology and other therapeutic areas. Radius' lead product, TYMLOS® (abaloparatide) injection, was approved by the U.S. Food and Drug Administration for the treatment of postmenopausal women with osteoporosis at high risk for fracture. The Radius clinical pipeline includes. The radius is the larger of the two bones of the forearm and is located radially. The distal end of the radius is defined as the area three centimetres proximal to the radiocarpal joint, where the radius interfaces with the lunate and scaphoid bone of the wrist. A fracture of the distal radius is usually caused by falling on the outstretched arm The Radius is one of the two large bones of the forearm, the other being the ulna.It extends from the lateral side of the elbow to the thumb side of the wrist and runs parallel to the ulna, which exceeds it in length and size. It is a long bone, prism-shaped and slightly curved longitudinally.The radius articulates with the capitulum of the humeru

The long bones of the foreleg consist of the humerus in the upper leg, and the lower leg has the ulna and radius bones. The toes follow the carpal (wrist) bones. The cat's hind leg consists of the femur (upper leg), and the tibia and fibula below consists and the cat's rear foot connects the tibia and fibula to the tarsal bones, a group of. Thrombocytopenia-absent radius (TAR) syndrome is characterized by the absence of a bone called the radius in each forearm and a shortage (deficiency) of blood cells involved in clotting (platelets). This platelet deficiency (thrombocytopenia) usually appears during infancy and becomes less severe over time; in some cases the platelet levels become normal.Thrombocytopenia prevents normal blood.

Radius Bone Definition, Diagram & Anatomy Body Map

Ninja Nerds!Join us in this video where we discuss the anatomy of the radius and ulna through the use of a model. ***PLEASE SUPPORT US***PATREON | https://ww.. Bone was obtained from the distal radius in 78 cases, the proximal ulna in 19 cases, and the small hand bones in 27 cases. At a minimum follow-up period of 22 months, they had 1 nonunion and 1 patient with chronic donor site pain Discover advanced anatomy exam-style quizzes. Learn anatomy faster and. remember everything you learn. Start Now. <. Humerus Bone Quiz - Anterior Markings. >. Radius and Ulna Bones Quiz: Posterior Markings Distal radius fracture is the medical term for a broken wrist. To fracture a bone means it is broken. A distal radius fracture occurs when a sudden force causes the radius bone, located on the thumb side of the wrist, to break. The wrist joint includes many bones and joints. The most commonly broken bone in the wrist is the radius bone

Radius: Anatomy, Function, and Treatmen

  1. Browse 735 radius bone stock illustrations and vector graphics available royalty-free, or start a new search to explore more great stock images and vector art. human bones - radius bone stock illustrations. abstract colored shape for your business idea. - radius bone stock illustrations. arm musculature, artwork - radius bone stock illustrations
  2. Once the bone has been mended and the cast removed, distal radius fracture physical therapy can begin, as explained in an October 2016 case study published by the Manual Therapy, Posturology & Rehabilitation Journal.To prevent further injury, check with your doctor before beginning exercises after a wrist fracture
  3. The two bones of the forearm (the radius and ulna) function to allow flexion and extension at the elbow as well as at the wrist via diarthrodial joints. This activity will be a brief review of the mechanism, diagnosis, and management of radius and ulna shaft fractures. Radius and ulna shaft fractures are one of the most common orthopedic.
  4. What is a distal radius or wrist fracture? It is a break in one of the long forearm bones (radius) at your wrist, you can also break the ulna at the same time. Diagram of a distal radius fracture . Why does my surgeon recommend surgery for my wrist fracture? If the broken bone becomes displaced or out of line it can affect the movement of the.

Distal Radius Fracture Orthopedics & Sports Medicin

Radius Anatomy-Muscle Attachment & Bony Landmark. The radius is a long bone in the forearm. It lies laterally and parallels to the ulna, It rotates to produce the motion supination and pronation of the forearm. The radius and the ulna to produce movement at the proximal and distal radio-ulnar joints.The radius is part of the elbow and the wrist. bones_radius_ulna 2/4 Bones Radius Ulna [Books] Bones Radius Ulna Fracture Management for the Small Animal Practitioner-Anne M. Sylvestre 2019-06-18 Fracture Management for the Small Animal Practitioner offers practical strategies and helpful approaches for managing fractures in dogs and cats the ulna and radius bones of the forearm to form the elbow joint. Ulna and Radius The ulna is located on the medial side of the forearm, and the radius is on the lateral side. These bones are attached to each other by an interosseous membrane. Ulna The proximal end of the ulna has a C-shaped trochlear notch.This region articulates with the trochlea of the humerus as part of the elbow joint The surgeon said that the pain will go away or significantly lessen. The location of the bone met is at the top of the radial head and has gone down the shaft at least 4 cm; sitting right next to PIN nerve that is likely causing the pain to radiate from shoulder to wrist. Taking that bone out will decompress the nerve

Complete Anatomy of 【Radius Bone】Learn With Pictures and

  1. This is an online quiz called Ulna & Radius. There is a printable worksheet available for download here so you can take the quiz with pen and paper. This quiz has tags. Click on the tags below to find other quizzes on the same subject. Anatomy
  2. The radius is attached at its proximal end to the humerus. The other bone of the forearm is the ulna. The head of the radius articulates with the capitulum of the humerus and Medially, it articulates with the radial fossa of the ulna. Distally, the radius articulates with the carpal bones of the wr
  3. About this Quiz. This is an online quiz called Radius and Ulna Quiz. There is a printable worksheet available for download here so you can take the quiz with pen and paper
  4. eral density (BMD) test is can provide a snapshot of your bone health. The test can identify osteoporosis, deter
  5. Ostectomy CPT Codes. Excision or curettage of bone cyst or benign tumor; radial head or neck or olecranon process; with autograft includes graft harvest (24125) Excision or curettage of bone cyst or benign tumor of radius or ulna (excluding head or neck of radius and olecranon process) (25120

Distal Radius Fracture (Wrist Fracture) Johns Hopkins

  1. Distal right radius oblique view The highlighted area articulates with the 1 Trapezium F 2 Scaphoid T 3 Triquetral F 4 Lunate F 5 Capitate F This is the scaphoid fossa of the distal radius which aticulates with the scaphoid bone 24
  2. Radius Bone Anatomy (also called Radial Bone) Now let's look at the radius bone anatomy, which is a Latin word that means staff or spoke. Head - the proximal end (or top) of the radius has a rounded cap looking area
  3. There are 30 bones in each upper limb. The humerus is the single bone of the arm, and the ulna (medially) and the radius (laterally) are the paired bones of the forearm. The base of the hand contains eight carpal bones, and the palm of the hand is formed by five metacarpal bones. The fingers and thumb contain a total of 14 phalanges
  4. d, however, that the term describes the shape of a bone, not its size. Long bones are found in the arms (humerus, ulna, radius) and legs (femur, tibia, fibula), as well as in the fingers (metacarpals, phalanges) and toes (metatarsals, phalanges)
  5. Each of these bones is wider at the ends and skinnier in the middle, to help give it strength where it meets another bone. At the end of the radius and ulna are eight smaller bones that make up your wrist. Although these bones are small, they can really move! Twist your wrist around or wave and you'll see how the wrist can move
  6. The most common type of bone fracture is a distal radius fracture, which often occurs when you try to catch yourself after a fall. 1. When the fracture is unstable, a doctor may recommend surgery. After surgery, you can expect to wear a fixed splint, cast, or removable splint. 3
  7. Bone tumors. Inflammation of surrounding tissue. Symptoms of radial tunnel syndrome include: Cutting, piercing, or stabbing pain at the top of the forearm or back of the hand, especially when you.

This can also result from a developmental difference in the length of the ulna compared with the adjacent radius in the forearm. Ulnar impaction syndrome. Wear and tear of cartilage and ligaments, caused by extra pressure when the ulna is longer than the other forearm bone. Growths. Masses including ganglion cysts (noncancerous tumors) Introduction. Distal radius fractures are one of the most common injuries encountered in orthopedic practice. They make up 8%−15% of all bony injuries in adults.[] Abraham Colles is credited with description of the most common fracture pattern affecting distal end radius in 1814, and is classically named after him.[] Colles' fracture specifically is defined as metaphyseal injury of cortico.

Radius and Ulna Horse, Ox and Camel Comparative anatomy

Radial head fracture - aftercare: MedlinePlus Medical

There are 30 bones in each upper limb (see [link]). The humerus is the single bone of the upper arm, and the ulna (medially) and the radius (laterally) are the paired bones of the forearm. The base of the hand contains eight bones, each called a carpal bone, and the palm of the hand is formed by five bones, each called a metacarpal bone The radius and the ulna are long, slightly curved bones that lie parallel from the elbow, where they articulate with the humerus, to the wrist, where they articulate with the carpals. The radius is located laterally, near the thumb, and the ulna medially, near the little finger. The radius and the ulna have a styloid process at the distal end. Radius is a commercial biopharmaceutical company committed to serving patients with unmet medical needs in endocrinology and other therapeutic areas. Radius' lead product, TYMLOS® (abaloparatide) injection, was approved by the U.S. Food and Drug Administration for the treatment of postmenopausal women with osteoporosis at high risk for fracture. The Radius clinical pipeline includes. The radius is the bone of the forearm that extends from the inside of the elbow to the thumb side of the wrist.The radius is situated on the lateral side of the ulna, which exceeds it in length and size.Its upper end is small, and forms only a small part of the elbow-joint; but its lower end is large, and forms the chief part of the wrist-joint.It is a long bone, prismatic in form and slightly.

Distal radius fractures occur through the distal metaphysis of the radius May involve articular surface frequently involving the ulnar styloid Most often result from a fall on the outstretched hand. - forced extension of the carpus, - impact loading of the distal radius. Associated injuries may accompany distal radius fractures The truth is: A fracture in one bone means that other bones could be at risk for a fracture caused by osteoporosis. In fact, your skeleton is one organ. If you have osteoporosis, it's important to tell the doctor who treats your osteoporosis about any fractures you've had, even a fragility, or low-impact, fracture

The radius is a bone that connects the humerus bone in the upper arm to the wrist. People with radial aplasia are born without the radius bone. Without the radial bone, the forearm appears shorter. Radius Bone Strength in Bending, Compression, and Falling and Its Correlation With Clinical Densitometry at Multiple Sites EVA-MARIA LOCHMU¨ LLER,1,2 CHRISTOPH A. LILL,3,4 VOLKER KUHN,1,5 ERICH SCHNEIDER,3 and FELIX ECKSTEIN5 ABSTRAC The radius is the larger of the two bones of the forearm. The end toward the wrist is called the distal end - hence the term, distal radius fracture. When it comes to frequency, the radius is the arm bone folks are most likely to break. In our office, we see radius fractures in a variety of situations: if a fall causes you to land on your. Distal Radius Bone Graft From the Second Extensor Compartment: A Safe and Effective Technique Tech Hand Up Extrem Surg . 2016 Dec;20(4):147-150. doi: 10.1097/BTH.0000000000000135 Armature ‣ Transform ‣ Scale Radius. Shortcut. Alt - S. You can alter the radius that a bone has by selecting the head, body or tail of a bone, and then press Alt - S and move the mouse left or right. If the body is selected the mean radius will be scaled. And as usual, with connected bones, you scale at the same time the radius of the.

Distal Radius Fractures (Broken Wrist) - OrthoInfo - AAO

What are the different types of distal radius fractures? Colles fracture - a common type of fracture in which the broken part of the bone tilts upward. Intra-articular fracture - extends into the wrist joint. Extra-articular fracture - doesn't extend into the wrist. Hairline or non-displaced fracture - the bone isn't out of place The Humerus is the long bone of the forearm, articulating with the scapula to form the shoulder and the radius and ulna to form the elbow. In situ, it lies obliquely along the ventral thorax and is more horizontal in larger species. The greater tubercle is not separated into two parts like in other species bone involvement (radius only, both radius and ulna) fracture type: Buckle injury: Compression injury failure of bone resulting in the cortex bulging outwards (unilateral or bilateral). Also known as a torus injury. Although there is a disruption to the cortical bone, the integrity of the bone is minimally compromised, resulting in different.

Ulna and Radius Fractures (Forearm Fractures) Johns

In single bone fractures,the proximal and distal radioulnar joints should be carefully inspected on x-ray. An isolated ulna fracture may be associated with dislocation of the radial head (Monteggia fracture-dislocation).These fractures should be referred to the nearest orthopaedic service on call. An isolated radius fracture may be associated with dislocation of the distal radioulnar joint. Bones of the upper extremity Clavicle collar bone , scapula shoulder blade , humerus, ulna, radius, finger and hand Detailed medical illustrations Latin medical terms Isolated on a white background Diagram of wrist have bone fractur The ulna is one of your forearm bones (the other is the radius). When you feel the pointy bone that makes up your elbow, you are feeling the ulna. The ulna joins up with the arm bone (humerus) to make the elbow joint (the other forearm bone contributes very little to the elbow joint). As you move toward the wrist, the ulna gets thinner and.

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Radial Head Fractures of the Elbow - OrthoInfo - AAO

Knirk JL, Jupiter JB. Intra-articular fractures of the distal end of the radius in young adults. J Bone Joint Surg 1986;68A(5):647-59. 2 mm step-off on AP x-ray greatly increased the risk of symptomatic osteoarthritis at 7 year follow-up Dorsal tilt and radial length not much affect on outcome Intra-Articular Incongruenc radius ( plural radii or radiuses ) ( anatomy) The long bone in the forearm, on the side of the thumb. ( zoology) The lighter bone (or fused portion of bone) in the forelimb of an animal. ( entomology) One of the major veins of the insect wing, between the subcosta and the media; the vein running along the costal edge of the discal cell

Radius: Definition, Location, Functions, Anatomy, Diagra

ulna: [ ul´nah ] ( L. ) the inner and larger bone of the forearm, on the side opposite the thumb. It articulates with the humerus and with the head of the radius at its proximal end; with the radius and bones of the carpus at the distal end Distal Radius Fracture ORIF Rehabilitation Protocol Kelly Holtkamp, M.D. Please fax initial evaluation and progress notes to 815‐381‐7498. 1‐14 Days Postoperative Do NOT remove the surgical bandage. Restrictions: No heavy lifting or pulling greater than 0 lbs. for 6 weeks. No driving if the surgica

DislocationMuscle Bone Attachments

Radius bone Britannic

This online quiz is called The Radius bone animal anatom Slotted Unbleached Bone Nut Starting with one of these slotted nuts saves me about an hour per job. And they're unbleached bone, my favorite for tone. —Erick Coleman, StewMac tech advisor Stewart-MacDonald is your source for quality bone! You already know bone nuts sound better than plastic Find the perfect Radius Bone stock photos and editorial news pictures from Getty Images. Select from premium Radius Bone of the highest quality Scaphoid bone. The scaphoid bone is the largest carpal bones of the proximal row and it lies beneath the anatomical snuff box.From a palmar view, it is surrounded on the proximal side by the radius, on the distolateral side by the trapezium bone and on the distomedial side by the trapezoid bone.Superomedially, it articulates with the lunate bone and inferomedially with the capitate bone

Radius - Anatomy Pictures and Informatio

This acoustic guitar bone saddle will fit many Gibson guitars as a replacement or upgrade. This bone saddle is compensated for improved intonation. The radius is set at 12 inches to match many Gibson fretboards and improve playability. Note: This bone saddle will not work for guitars with a compound radius, or a 16 inch radius Ulna, inner of two bones of the forearm when viewed with the palm facing forward. (The other, shorter bone of the forearm is the radius .) The upper end of the ulna presents a large C-shaped notch—the semilunar, or trochlear, notch—which articulates with the trochlea of the humerus (upper arm bone) to form the elbow joint