Biceps Rupture

Introduction

A biceps rupture involves a complete tear of the main tendon that attaches the top of the biceps muscle to the shoulder. It happens most often in middle-aged people and is usually due to years of wear and tear on the shoulder. A torn biceps in younger athletes sometimes occurs during weightlifting or from actions that cause a sudden load on the arm, such as hard fall with the arm outstretched.

This guide will help you understand

• what parts of the shoulder are affected
• the causes of a biceps rupture
• ways to treat this problem

Anatomy

What parts of the shoulder are affected?

The biceps muscle goes from the shoulder to the elbow on the front of the upper arm. Two separate tendons (tendons attach muscles to bones) connect the upper part of the biceps muscle to the shoulder. The upper two tendons of the biceps are called the proximal biceps tendons, because they are closer to the top of the arm.

The main proximal tendon is the long head of the biceps. It connects the biceps muscle to the top of the shoulder socket, the glenoid. Beginning at the glenoid, the tendon of the long head of the biceps travels down the front of the upper arm. The tendon runs within the bicipital groove and is held in place by the transverse humeral ligament.

The short head of the biceps connects on the corocoid process of the scapula. The corocoid process is a small bony knob just in from the front of the shoulder.

The lower biceps tendon is called the distal biceps tendon. The word distal means the tendon is further down the arm. The lower part of the biceps muscle connects to the elbow by this tendon.

The muscles forming the short and long heads of the biceps stay separate until just above the elbow where they unite and connect to the distal biceps tendon.

Tendons are made up of strands of a material called collagen. The collagen strands are lined up in bundles next to each other.

Because the collagen strands in tendons are lined up, tendons have high tensile strength. This means they can withstand high forces that pull on both ends of the tendon. When muscles work, they pull on one end of the tendon. The other end of the tendon pulls on the bone, causing the bone to move.

Contracting the biceps muscle can bend the elbow upward. The biceps can also help flex the shoulder, lifting the arm up, a movement called flexion. And the muscle can rotate, or twist, the forearm in a way that points the palm of the hand up. This movement is called supination, which positions the hand as if you were holding a tray.

Related Document: A Patient's Guide to Shoulder Anatomy

Causes

Why did my biceps rupture?

Biceps ruptures generally occur in people who are between 40 and 60 years old. People in this age group who've had shoulder problems for a long time are at most risk. Often the biceps ruptures after a long history of shoulder pain from tendonitis (inflammation of hte tendon) or problems with shoulder impingement. Shoulder impingement is a condition where the soft tissues between the ball of the upper arm and the top of the shoulder blade (acromion) get squeezed with arm motion.

Related Document: A Patient's Guide to Shoulder Impingement

Years of shoulder wear and tear begin to fray the biceps tendon. Eventually, the long head of the biceps weakens and becomes prone to tears or ruptures. Examination of the tissues within most torn or ruptured biceps tendons commonly shows signs of degeneration. Degeneration in a tendon causes a loss of the normal arrangement of the collagen fibers that join together to form the tendon. Some of the individual strands of the tendon become jumbled due to the degeneration, other fibers break, and the tendon loses strength.

A rupture of the biceps tendon can happen from a seemingly minor injury. When it happens for no apparent reason, the rupture is called nontraumatic.

Aging adults with rotator cuff tears also commonly have a biceps tendon rupture. When the rotator cuff is torn, the ball of the humerus is free to move too far up and forward in the shoulder socket and can impact the biceps tendon. The damage may begin to weaken the biceps tendon and cause it to eventually rupture.

Related Document: A Patient's Guide to Rotator Cuff Tears

Symptoms

What does a ruptured biceps feel like?

Patients often recall hearing and feeling a snap in the top of the shoulder. Immediate and sharp pain follow. The pain often subsides quickly with a complete rupture because tension is immediately taken off the pain sensors in the tendon. Soon afterward, bruising may develop in the middle of the upper arm and spread down to the elbow. The biceps may appear to have balled up, especially in younger patients who've had a traumatic biceps rupture. The arm may feel weak at first with attempts to bend the elbow or lift the shoulder.

The biceps tendon sometimes only tears part of the way. If so, a pop may not be felt or heard. Instead, the front of the shoulder may simply be painful, and the arm may feel weak with the same arm movements that are affected with a complete biceps rupture.

Diagnosis

How can my doctor be sure my biceps ruptured?

Your doctor will first take a detailed medical history. You will need to answer questions about your shoulder, if you feel pain or weakness, and how this is affecting your regular activities. You'll also be asked about past shoulder pain or injuries.

The physical exam is often most helpful in diagnosing a rupture of the biceps tendon. Your doctor may position your arm to see which movements are painful or weak. By feeling the area of the muscle and tendon, the doctor can often tell if the tendon has ruptured. The muscle may look and feel balled up in the middle of the arm, and a dent can sometimes be felt near the top of the shoulder.

X-rays may be ordered. X-rays show the bones that form the shoulder joint and may show bony changes that have contributed to a ruptured biceps. For example, bone spurs (small projections of bone) may be seen on the X-ray. Spurs that form near the biceps tendon will often puncture the tendon as the arm is used with activity. X-rays can also show if there are other problems, such as a fracture. Plain X-rays do not show soft tissues like tendons and will not show a biceps rupture.

Your doctor may also order a magnetic resonance imaging (MRI) scan. This is the most reliable way to check whether the biceps tendon is only partially torn or if the tendon actually ruptured. An MRI is a special imaging test that uses magnetic waves to create pictures of the shoulder in slices. The MRI can also show if there are other problems in the shoulder.

Treatment

What treatment options are available?

Nonsurgical Treatment

Doctors usually treat a ruptured long head of biceps tendon without surgery. This is especially true for older individuals who can tolerate loss of arm strength or if the injury occurs in the nondominant arm.

Not having surgery usually only results in a moderate loss of strength. The short head of the biceps is still attached and continues to supply strength to raise the arm up. Flexion of the elbow may be affected, but supination (the motion of twisting the forearm such as when you use a screwdriver) is usually affected more. Not repairing a ruptured biceps reduces supination strength by about 20 percent.

Nonsurgical measures could include a sling to rest the shoulder. Patients may be given anti-inflammatory medicine to help ease pain and swelling and to help return people to activity sooner after a biceps tendon rupture. These medications include common over-the-counter drugs such as ibuprofen.

Doctors may have their patients work with a physical or occupational therapist. At first, your therapist will give you tips how to rest your shoulder and how to do your activities without putting extra strain on the sore area.

Your therapist may apply ice and electrical stimulation to ease pain. Exercises are used to gradually strengthen other muscles that help do the work of a normal biceps muscle.

Surgery

Surgery is reserved for patients who need arm strength, are concerned with cosmetics of the balled up biceps, or who have pain that won't go away.

Biceps Tenodesis

Biceps tenodesis is a surgery to anchor the ruptured end of the biceps tendon. A common method, called the keyhole technique, involves anchoring the ruptured end to the upper end of the humerus. The keyhole describes the shape of a small hole made by the surgeon in the humerus. The end of the tendon is slid into the top of the keyhole and pulled down to anchor it in place.

The surgeon begins by making an incision on the front of the shoulder, just above the axilla (armpit). The overlying muscles are separated so the surgeon can locate the damaged end of the biceps tendon. The end of the biceps tendon is prepared by cutting away frayed and degenerated tissue.

The transverse humeral ligament is split, exposing the bicipital groove. An incision is made along the floor of the bicipital groove. The bleeding from the incision gets scar tissue to form that will help anchor the repaired tendon in place.

A burr is used to form a keyhole-shaped cavity within the bicipital groove. The top of the cavity is round. The bottom is the slot of the keyhole. It is made the same width as the biceps tendon.

The surgeon rolls the top end of the biceps tendon into a ball. Sutures are used to form and hold the ball. The elbow is bent, taking tension off the biceps muscle and tendon. The surgeon pushes the tendon ball into the top part of the keyhole. As the elbow is gradually straightened, the ball is pulled firmly into the narrow slot in the lower end of the keyhole.

The surgeon tests the stability of the attachment by bending and straightening the elbow. When the surgeon is satisfied with the repair, the skin incisions are closed, and the shoulder is placed in a protective sling.

Acromioplasty and Direct Tenodesis

This procedure may be used for younger patients who've had a recent traumatic biceps rupture, have problems with impingement, and who have an injured rotator cuff.

Acromioplasty involves cutting and reshaping the acromion, the bone that forms the top part of the shoulder. Some surgeons will also sever the corocohumeral ligament, which arches over the top of the shoulder joint. These steps relieve pressure on the tissues between the ball of the humerus and the acromion, including the biceps and rotator cuff tendons. For this reason, this procedure is sometimes called subacromial decompression. The ruptured end of the biceps is then anchored to the upper end of the humerus. This is called direct tenodesis.

The surgeon begins by making an incision across the top of the shoulder. The shoulder muscles are separated to expose the top of the humerus. Bone spurs are removed, along with part of the acromion. The surgeon then smooths the rough ends of the bone.

After the acromioplasty procedure, the surgeon focuses on the biceps tendon. When the bicipital groove is in view, the transverse humeral ligament is cut. Next, an osteotome is used to open the joint capsule and create a trough next to the bicipital groove. Three small holes are drilled along each side of the trough. The surgeon places the loose end of the biceps tendon in the new groove.

Sutures are woven into one drill hole, through the tendon, and out the opposite drill hole. This is repeated for the remaining two sets of drill holes. Next, the top end of the ruptured tendon is cut off. Finally, the three sutures are firmly secured.

When the surgeon is satisfied with the repair, the transverse humeral ligament and joint capsule are sutured, followed by the skin incision. The arm is bent at the elbow and placed in a light splint that is to be worn for four weeks after surgery.

Rehabilitation

What should I expect after treatment?

Nonsurgical Rehabilitation

In cases where the ruptured biceps tendon is treated nonsurgically, you will need to avoid heavy arm activity for three to four weeks. As the pain and swelling resolve, you should be safe to begin doing more normal activities.

If the tendon is only partially torn, however, recovery takes longer. Patients usually need to rest the shoulder using a protective sling. As symptoms ease, a carefully progressed rehabilitation program under the supervision of a physical or occupational therapist usually follows. This often involves four to six weeks of therapy.

After Surgery

Immediately after surgery, you'll need to wear your shoulder sling for about four weeks. Some surgeons prefer to have their patients start a gentle range-of-motion program soon after surgery. When you start therapy, your first few therapy sessions may involve ice and electrical stimulation treatments to help control pain and swelling from the surgery. Your therapist may also use massage and other types of hands-on treatments to ease muscle spasm and pain.

You will gradually start exercises to improve movement in the forearm, elbow, and shoulder. You need to be careful to avoid doing too much, too quickly.

Heavier exercises for the biceps muscle are avoided until at least four to six weeks after surgery. Your therapist may begin with light isometric strengthening exercises. These exercises work the biceps muscle without straining the healing tendon.

At about six weeks, you start doing more active strengthening. As you progress, your therapist will teach you exercises to strengthen and stabilize the muscles and joints of the elbow and shoulder. Other exercises will work your arm in ways that are similar to your work tasks and sport activities. Your therapist will help you find ways to do your tasks that don't put too much stress on your shoulder.

You may require therapy for six to eight weeks. It generally takes three to four months, however, to safely begin doing forceful biceps activity after surgery. Before your therapy sessions end, your therapist will teach you a number of ways to avoid future problems.