Surgical Management of Traumatic Conditions of the Elbow: Interposition Arthroplasty
Bernard F. Morrey
Matthew L. Ramsey
DEFINITION AND PATHOGENESIS
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Posttraumatic conditions of the elbow represent a spectrum of disorders involving the elbow as a result of previous trauma. Treatment for posttraumatic conditions is individu-alized depending on the characteristics of the pathology as well as the functional demands and age of the patient.
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Posttraumatic arthritis
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Primary pathology involves posttraumatic degeneration of the articular surface.
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Secondary pathologies can include contracture, loose bodies, heterotopic bone, and impingement and irritation from retained hardware.
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Nonunion of the distal humerus
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May involve all or a part of the articular surface
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Frequently associated with marked fixed angular and/or rotatory deformity
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Dysfunctional instability of the elbow
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Special clinical situation where the fulcrum for stable elbow function is lost
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Associated with considerable bone loss
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The forearm may be dissociated from the brachium (FIG 1).
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Chronic instability (dislocation)
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Chronic ligamentous instability of the elbow can lead to articular degeneration, particularly in the elderly osteopenic patient.
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Fixed contracture and displacement are characteristic.
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PATIENT HISTORY AND PHYSICAL FINDINGS
Patient History
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The patient history is directed at gaining information about the initial injury, treatments undertaken, complications of treatment, presenting complaints, and patient expectations.
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Detailed investigation of the patient’s symptoms should include questions regarding the degree of pain, presence of instability or stiffness, and mechanical symptoms of catching or locking.
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Presence of radiating pain especially in the ulnar nerve distribution is solicited.
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Special attention is paid to night pain and pain at rest, as these suggest a possibility of sepsis. Note: A history of drainage or any evidence of infection is especially critical to elicit.
Physical Examination
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Physical examination of the elbow should follow a systematic approach.
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Inspection of the elbow
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Especially for warmth and redness
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Presence and location of previous skin incisions or persistent wounds
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Alignment of the extremity at rest
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Prominent hardware
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Range of motion
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Localization of pain during active and passive motion
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Active range of motion (AROM) is assessed and compared to the opposite side. The degree of motion, smoothness of motion, and feel of the end point is established.
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Normal AROM varies but should be symmetric with the opposite unaffected side.
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Range of motion should be from near full extension (may have hyperextension) to 130 to 140 degrees of flexion.
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Normal forearm rotation is an arc of 170 degrees, with slightly more supination than pronation.
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Functional range of motion has been defined as a flexion-extension arc from 30 to 130 degrees and a pronation-supination arc from 50 degrees of pronation to 50 degrees of supination.10
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Passive range of motion (PROM) is then assessed and compared to the active motion arc.
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Palpation of the elbow
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Motor function of the elbow should be assessed. In particular, the flexor (biceps and brachialis) and extensor (triceps) function should be evaluated.
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IMAGING AND OTHER DIAGNOSTIC STUDIES
Plain X-rays
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Orthogonal views of the elbow are mandatory.
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A good lateral radiograph can typically be obtained.
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A useful anteroposterior (AP) radiograph can be difficult to obtain, particularly if the patient has a significant flexion contracture.
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Note: If difficulty is encountered, use fluoroscopic guidance to obtain proper orientation.
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Oblique radiographs can be helpful in obtaining more detail.
Advanced Imaging
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Computed tomography (CT) scan
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CT scans are particularly helpful in assessing the integrity of the bone and establishing whether the joint space is reasonably preserved.
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Three-dimensional reconstructions provide a better understanding of complex osseous injuries (FIG 2).
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Magnetic resonance imaging (MRI)
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MRI is rarely needed in the assessment of a posttraumatic joint and is therefore used sparingly.
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May be helpful to assess suspicious and atypical soft tissue deformity or swelling
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DIFFERENTIAL DIAGNOSIS
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Nonunion/malunion of the distal humerus
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Posttraumatic stiffness of the elbow
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Chronic dislocation of the elbow
NONOPERATIVE MANAGEMENT
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The success of nonoperative management depends on specific features of the pathology and the motivation and goals of the patient.
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Activity modification in order to reduce the forces across the elbow
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Maintain range of motion of the elbow. Aggressive efforts to regain lost motion can inflame and thus aggravate the joint.
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External bracing is occasionally used to support an unstable extremity. However, in general, bracing is poorly tolerated and functionally limiting.
SURGICAL MANAGEMENT
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Surgical management is directed at addressing the underlying cause of disability, taking into consideration the patients age, pathology, physical requirements, and expectations.
Indications
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Age and functional need prompt consideration of this intervention.
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Age is a surrogate for activity.
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In general, patients younger than age 55 years are always candidates for interposition???all else being equal.
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Those older than age 70 years with similar pathology are usually better candidates for replacement.
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Patients with pain and/or loss of range of motion who have failed nonoperative management
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Posttraumatic arthritis in patients who are either too young for total elbow arthroplasty (TEA) or who are unwilling to accept the functional restrictions with TEA
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The patients who do best following interposition are those with painful loss of motion when there is no requirement for aggressive, heavy use of the extremity.
Contraindications
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Active or subacute infection (septic arthritis with persistent infection)8
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Grossly unstable elbow
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Marked angular deformity (exceeding 15 degrees)
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Inadequate bone stock
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Patients unable or unwilling to follow postoperative instructions
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Inexperience with the technique
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Pain at rest or pain without associated functional loss (relative contraindication)
Preoperative Planning
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Graft options
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Allograft Achilles tendon7: has the advantage of no donor site morbidity
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The abundance of the tissue allows for variable thickness depending on reconstructive need.
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Can also be used to reconstruct the collateral ligaments if necessary
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Autogenous dermis or fascia lata
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Best used for limited applications (eg capitellum)
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Allograft dermal tissue
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An articulated (hinged) external fixator must be available.

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