A Bankart procedure, also known as a Broca-Perthes-Bankart procedure, is a surgical technique for the repair of recurrent shoulder joint dislocations. In the procedure, the torn ligaments are re-attached to the proper place in the shoulder joint, with the goal of restoring normal function.
The shoulder is the junction of three bones: the upper arm bone (humerus), the collarbone (clavicle), and the shoulder blade (scapula). The shoulder joint (glenohumeral joint) is the result of the head of the humerus bone fitting in the cavity of the shoulder blade (glenoid cavity), the joint being held together by the labrum, a rim of soft tissue that surrounds the glenoid. As a result of excessive force being applied to the arm, the head of the humerus may be forced out of the glenoid cavity (dislocation), and the supporting ligaments of the shoulder joint may be torn. These ligaments may heal so that the shoulder regains its stability. However, sometimes the ligaments do not heal, making the shoulder unstable and painful. This condition is referred to as traumatic instability of the shoulder, traumatic glenohumeral instability, or a Bankart lesion.
The goal of a Bankart procedure for traumatic glenohumeral instability is the safe and secure re-attachment of the torn ligaments to the tip of the glenoid from which they were detached. The surgery has the advantage of allowing patients to resume many of their activities of daily living while the repair is healing. The surgery also minimizes the unwanted joint stiffness associated with such injuries.
The shoulder is the most commonly dislocated major joint following severe trauma, such as an auto collision or a fall onto an outstretched arm. Some 96% of dislocations involve the front of the shoulder (anterior), with 1–3% occurring in the back (posterior). Falls and car accidents are common causes of first-time dislocations, but recurrent dislocations are often due to seemingly inoffensive activities such as raising the arm over the head, or combing hair. Shoulder dislocations are more common in males than females, and in young adults.
In general, shoulder surgery can be performed in two fundamentally different ways: either using closed surgical techniques ( arthroscopic surgery ) or using open surgical techniques.
An open surgery Bankart procedure is performed under general anesthesia. The patient is placed in a 30-degree inclined chair position with the arm free over the edge of the operating table. A bag is placed under the center of the shoulder blade of the shoulder being operated on to support the shoulder and to push the shoulder blade forward. Prepping and draping allow the arm to be freely moveable and allow a good view of the surgical field.
The whole upper limb is prepared with antiseptic. An examination under anesthesia is performed to confirm the exact nature of the instability. The surgeon makes a long incision to gain access to the joint, often cutting through the deltoid muscle to operate on the internal structures of the shoulder, and proceeds to sew the joint capsule to the detached labrum tissues.
The arthroscopic Bankart procedure tries to imitate the open Bankart procedure. Arthroscopy is a microsurgical technique by which the surgeon can use an endoscope to look through a small hole into the shoulder joint. The endoscope is an instrument the size of a pen, consisting of a tube fitted with a light and a miniature video camera, which transmits an image of the joint interior to a television monitor. The detached part of the labrum and the associated ligaments are reattached to bone along the rim of the glenohumeral cavity through a small "keyhole" incision. This is done with little disruption to the other shoulder structures and without the need to detach and reattach the overlying shoulder muscle (subscapularis).
The physician diagnoses a Bankart lesion from the patient's history, by performing a thorough physical examination of the joint, and taking the proper x rays. The examination often reveals that the head of the humerus slips easily out of the joint socket, even when it is pressed into it. This is called the "load and shift test." X rays may also reveal that the bony lip of the glenoid socket is rounded or deficient, or that the head of the humerus is not centered in the glenoid cavity.
A diagnostic arthroscopy is also often used to confirm the presence and extent of the shoulder instability. In this procedure, a thin fiberoptic scope is inserted into the shoulder joint space to allow direct visualization of its internal structures. An electromyogram may also be obtained if the treating physician suspects the possibility of nerve injury.
Patients should attend to any health problem so as to be in the best possible condition for this procedure. Smoking should be stopped a month before surgery and not resumed for at least three months afterwards. Any heart, lung, kidney, bladder, tooth, or gum problems should be managed before surgery. The orthopedic surgeon needs to be informed of all health issues, including allergies and the non-prescription and prescription medications being used by the patient.
Exercises are usually started on the day following surgery with instructions from a physical therapist, five times daily, including assisted flexion and external rotation of the arm. The other arm is used to support the arm that underwent surgery until it can perform the exercises alone. The patient is allowed to perform many activities of daily living as tolerated, but without lifting anything heavier than a glass or plate. If a patient can not comply with restricted use of the shoulder, the arm is kept in a sling for three weeks. Otherwise, a sling is used only for comfort between exercise sessions and to protect the arm when the patient is out in public and at night while sleeping. Driving is allowed as early as two weeks after surgery, if the shoulder can be used comfortably, especially if the patient's car has automatic transmission. At eight to 10 weeks, the patient can usually resume light, low-risk activities, such as swimming and jogging. If involved in sports, the patient may return to training at three months. Hospital physiotherapy is rarely prescribed and only in cases of delayed rehabilitation or shoulder stiffness.
The following risks are associated with a Bankart procedure:
Normal results for a Bankart procedure include:
According to the American Academy of Family Physicians, the classic treatment of recurrent shoulder dislocations remains open surgical Bankart repair. This approach has a success rate as high as 95% in effectively removing shoulder instabilities. In a recent study of young athletes, Bankart repair was compared with three weeks of immobilization for the treatment of an initial anterior shoulder dislocation. The group treated surgically had fewer episodes of recurrent instability than the group managed with immobilization.
Surgery for anterior dislocation of the shoulder fails in one out of 10 to one out of 20 cases, with a higher incidence of failure in arthroscopic Bankart procedures when compared to the open surgical approach. There is also a higher incidence of failure in patients who smoke, those who start using their shoulder vigorously very early after the repair, and in those with very loose ligaments.
The Bristow procedure is an alternative surgical procedure used to treat shoulder instability. In this technique, the coracoid process (a long, curved projection from the scapula) with its muscle attachments is transferred to the neck of the scapula and creates a muscle sling at the front of the glenohumeral joint.
Shoulders can be stabilized and strengthened with special exercises. During the early phases of such physical therapy programs, the patient is taught to use the shoulder only in the most stable positions—those in which the humerus is elevated in the plane of the scapula. As coordination and confidence improve, progressively less stable positions are attempted.
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American Academy of Orthopedic Surgeons. 6300 North River Road, Rosemont, Illinois, 60018-4262. (847) 823-7186; (800) 346-AAOS. http://www.aaos.org .
McNeal, Melanie, and David Lintner, M.D. "Traumatic Instability: ACLR or Bankart Procedure." Dr. Lintner. Copyright 2003 [cited June 7, 2003]. http://www.drlintner.com/aclr.htm .
Monique Laberge, Ph. D.
A Bankart procedure is performed in a hospital setting by an orthopedic surgeon specializing in shoulder instability problems.