Due to this limitation, the forearm allows for increased motion of the wrist and hand without warranting any motion from the elbow joint. There is also a radial notch for the head of the radius, and the ulnar tuberosity to which muscles attach. For this reason, a diaphyseal forearm fracture usually happens in a younger population, as their reflexes cause them to attempt to break their fall.. The head of ulna presents an articular surface, part of which, of an oval or semilunar form, is directed downward, and articulates with the upper surface of the triangular articular disc which separates it from the wrist-joint; the remaining portion, directed lateralward, is narrow, convex, and received into the ulnar notch of the radius. Read our, Medically reviewed by Richard N. Fogoros, MD, Medically reviewed by Jonathan Cluett, MD, Medically reviewed by Stuart Hershman, MD, Medically reviewed by Rochelle Collins, DO, Medically reviewed by Laura Campedelli, PT, DPT, Arm Yourself With Knowledge About Humerus Fractures of Your Arm, The Nerve That Gives Us the Opposable Thumb, Common Fractures of the Arm, Elbow, and Wrist That Your PT Can Treat, Physical Therapy for Different Types of Elbow Injuries, Everything to Know About Kienböck's Disease, Physical Therapy Can Help with Injuries to Elbow Ligaments, How to Get Back to Normal After an Elbow Fracture, How a Proximal Humeral Fracture Is Treated, How to Treat a Broken Bone That Does Not Penetrate Skin, Treatment of diaphyseal forearm fractures in children, Stress fractures: definition, diagnosis and treatment, The principles and practice of open fracture care, 2018, Elbow Fracture Open Reduction and Internal Fixation, Nonoperative treatment of both-bone forearm shaft fractures in children: predictors of early radiographic failure. It forms the elbow joint with the humerus and also articulates with the radius both proximally and distally.
A single fracture to the ulna (or radius) is usually seen in instances where a direct blow or outside force acts on the bone. The upper end (the head) of the ulna meets with the lower end of the humerus and one side of the radius. Like many other bones, the ulna stores minerals and produces blood cells in the bone marrow. Knutsen EJ, Goldfarb CA. Its anterior surface is smooth, concave, and forms the upper part of the semilunar notch.
Last medically reviewed on January 20, 2018, The adductor hallucis is a two-headed muscle that is responsible for flexing and contracting the big toe, and reinforcing the arch of the foot. The ulna forms part of the wrist joint and elbow joints. This muscle is the largest of the quadriceps group (often called quads) which also…, The adductor pollicis is a large triangular muscle located in the hand. Philadelphia, PA: Elsevier; 2018:57-62. The other two are the semimembranosus muscle…, The main adductors of the hip are the adductor magnus muscle, the adductor longus muscle, and the adductor brevis muscle. Michael Menna, DO, is board-certified in emergency medicine. Specifically, the ulna joins (articulates) with: Being longer and thinner, the ulna is often more easily fractured as a result of trauma. The meeting and movement between the humerus and the ulna allow the common motion of bending and straightening the arm at the elbow to occur.
This notch allows for the radius to move smoothly and fre…
Therapeutic rehabilitation and medical treatments will vary based on the type of fracture. 2014;6(2):5325. doi:10.4081/or.2014.5325. [4], In four-legged animals, the radius is the main load-bearing bone of the lower forelimb, and the ulna is important primarily for muscular attachment.
Depending on the healing process and the patient’s progress, doctors typically allow a five-pound weight limit after the second week with the restriction to not complete any forearm rotation.
In many mammals, the ulna is partially or wholly fused with the radius, and may therefore not exist as a separate bone. Madelung’s deformity is a birth defect resulting in the poor formation of the palmar ligament and the forearm bones. 2015;51(1):3-10. doi:10.1016/j.rboe.2015.12.008, Diwan A, Eberlin KR, Smith RM. The ulna is one of two bones that make up the forearm, the other being the radius. Bowman EN, Mehlman CT, Lindsell CJ, Tamai J. Nonoperative treatment of both-bone forearm shaft fractures in children: predictors of early radiographic failure. Fracture to both forearm bones, the ulna, and the radius is typically the result of a fall or other related incident. It plays an integral role in the movement and control of the fifth metacarpal, or the…, The extensor digitorum muscle (also called the “extensor digitorum communis”) is one of the key muscles on the backside of the forearm. Rehabilitation after fractures of the forearm and elbow. Its posterior surface, directed backward, is triangular, smooth, subcutaneous, and covered by a bursa. Stutz C, Waters PM. The notch is concave from above downward, and divided into a medial and a lateral portion by a smooth ridge running from the summit of the olecranon to the tip of the coronoid process. However, the primary purpose of the ulna is to support the forearm and allow it to move, according to LearnBones.com. In The Human Bone Manual. The coronoid process is a triangular eminence projecting forward from the upper and front part of the ulna.
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