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Humeral Shaft Fractures

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Humeral shaft fractures account for 3 to 5% of all fractures in adults and for 20% of all humeral fractures. Fractures of the humerus can occur proximally, mid-shaft, or distally. Humeral shaft fractures occur most commonly in the elderly and are significantly associated with impairment of independence and quality of life. Majority of the fractures are non-displaced and can be treated non-operatively, which is still the standard treatment of isolated humeral shaft fractures. Although non-surgical management of humeral shaft fracture can be associated unsatisfactory results. Surgical treatment is reserved for specific conditions and offers better outcomes. Humeral shaft fractures those managed with internal fixation supports relative stabilization …show more content…

It provides strength and resistance to both torsional and bending forces. The proximal humerus articulates with the glenoid cavity of the scapula to form the shoulder joint. The muscles and tendons of the rotator cuff, the acromion, and ligamentous attachments between the coracoid process of the scapula and the acromion serve to both stabilize the gleno-humeral joint and provide a wide range of motion of the shoulder joint. The distal humerus articulates with the radius and ulna at the elbow. The greater tuberosity is located on the superior aspect of the humerus just lateral to the humeral head and it provides attachment for three of the rotator cuff muscles supraspinatus, infraspinatus and teres minor. The lesser tuberosity of the humerus is located on the anterior surface of the humerus and provides attachment for the subscapularis muscle. To classify the fractures, the lesser tuberosity marks the boundary between the proximal humerus and the mid-shaft. Humeral shaft is enveloped in the muscles and soft tissue which provide favorable non-operative healing mechanism in uncomplicated fractures. Muscles originating on the humeral shaft include the brachialis, brachioradialis, and the medial and lateral heads of the triceps brachii. The deltoid, pectoralis major, teres major, latissimus dorsi, and coracobrachialis all insert on the humeral shaft. Different location of the fracture along the humeral shaft will have specific deforming forces acting on the fracture fragments. Fractures near the midpoint of the shaft can have proximal fragment pulled laterally by the deltoid, while the distal fragment pulled medially by the triceps and biceps. Fractures near mid-shaft of the humerus are more likely to shorten than proximal or distal fractures due to the strong pull of the biceps and triceps muscles. The blood supply to the humeral shaft

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