MUSCULOSKELETAL INJURIES

Published on 14/03/2015 by admin

Filed under Emergency Medicine

Last modified 22/04/2025

Print this page

rate 1 star rate 2 star rate 3 star rate 4 star rate 5 star
Your rating: none, Average: 0 (0 votes)

This article have been viewed 1503 times

MUSCULOSKELETAL INJURIES

OVERUSE SYNDROMES

Whenever a muscle is overused—that is, exercised past its state of conditioning—there is actual destruction of the muscle tissue and generation of lactic acid. Given a reasonable rest period, the products of metabolism are carried away in the circulation and the muscle tissue regenerates to a healthy, sometimes even stronger, condition. However, if the exercise has been vigorous and unrelenting, the participant may suffer from a variety of aches and pains that are generally categorized as overuse syndromes.

Plantar Fasciitis

Plantar fasciitis is inflammation of the fascia (tough connective sheath tissue) that encloses the muscles and tendons that traverse the bottom of the foot. It is a syndrome of overuse, caused by excessive walking or running, particularly associated with repetitive impact on the bottom of a foot that is improperly cushioned or without appropriate arch support. Symptoms include pain in the bottom of the foot (ball, arch, and/or heel), worsened by repetitive weight bearing. The pain is often worse with the first steps in the morning or after a period of inactivity. It occurs commonly in athletes and long-distance hikers, particularly if they wear poorly fitting shoes or boots. When examining the foot, pain may be elicited by applying pressure to the forward-inside area of the heel.

Treatment consists of rest, elevation of the foot with cold (ice packs) applied to the tender areas at the end of the hiking day, wearing orthotics, gentle stretching (e.g., pulling back the toes and front part of the foot), and administration of an oral nonsteroidal antiinflammatory drug, such as ibuprofen. Worn at night, a splint that holds the foot in neutral position—thus keeping the plantar fascia slightly stretched—may help, as may avoiding walking barefoot or in flat-soled shoes.

If the victim must continue to walk on the painful foot, it can be taped to provide arch support; this can do much to reduce pain. It is accomplished as follows: Apply a thin layer of benzoin or spray tape adhesive onto the bottom of the foot. Fix an anchor strip of ¾ in (1.9 cm) adhesive tape in a U shape around the heel from just under the malleoli (prominences of the ankle) up to just behind the level of the “knuckles” of the toes (Figure 169, A). Next, lay fairly tight cross-strips of ½ in (1.3 cm) tape across the bottom of the foot, with their ends torn to lay on the anchor strip (Figure 169, B). This creates a “sling” of tape under the foot for support. Finally, apply another U-shaped piece of tape around the heel that crosses under the center of the arch and locks down the crosspieces (Figure 169, C).

Torn Muscle

A torn muscle (“pulled” muscle) is recognized as sudden pain in a muscle group associated with a particular vigorous exertion, such as sprinting or lifting a heavy object. Depending on the severity of the injury, there may be associated bruising, swelling, loss of mobility, and/or weakness. For instance, a small tear in the deltoid muscle of the shoulder may cause minor discomfort on lifting the arm over the head, while a complete separation of the quadriceps group in the anterior thigh will cause inability to straighten the leg at the knee, extreme local pain, blue discoloration of the knee, and a defect in the shape of the muscles above the knee that is easily felt and seen.

In general, a minor muscle injury can be distinguished from a bone injury by evaluating active and passive range of motion. Active range of motion is the range of normal activity the victim can manage without rescuer assistance; this will be painful with both muscle and bone injuries. Passive motion is movement of a body part performed only with the aid of the rescuer; no effort is provided by the victim, who should attempt to relax the muscle completely. If there is no pain on passive (assisted) motion, but pain is present on active motion, the injury is most likely muscular, because an injured bone will hurt no matter how it is moved. If there is pain on passive motion, with or without pain on active motion, suspect a bone injury.

Minor muscle injuries should be treated in the first 24 hours with immobilization, the application of cold (insulated ice packs or chemical cold packs, for example; do not apply ice directly to the skin) for 30 to 45 minutes every 2 to 3 hours, and elevation. After 48 to 72 hours, the application of heat (warm water or a heating pad, not ointments) and gentle movement should be started. If a significant injury is suspected (for example, complete tear of the biceps muscle or quadriceps muscle group), the injury should be immobilized as for a fracture (see page 74) and the victim transported to a physician.

The best way to prevent a pulled muscle is to stretch and warm up adequately. This allows the local blood flow to increase and minimizes the risk for small tears that can cause spasm, which in turn leads to decreased flexibility.

Sprains and Strains

Sprains and strains are injuries to ligaments (which attach one bone to another) and tendons (which attach muscle to bone) that are incurred by twisting, direct blunt trauma, or overexertion. Symptoms include pain, swelling and/or deformity, decreased range of motion secondary to pain, and bruising. The treatment is the same as for a suspected fracture. The injured part should be elevated, immobilized (see page 74), and treated with cold applications for the first 24 to 48 hours (“RICE”: rest, ice, compression, and elevation). After 72 hours, heat may be applied. It is important to prevent reinjury (ankles are notorious) by proper wrapping or the application of a splint. Because the injured joint is immediately weakened, it should not be relied on for great exertion.

The most common sprain is of an ankle. If the injury is minor (no chance of a fracture) and/or if the victim needs to put weight on the ankle to seek help, the ankle may be wrapped snugly with an elastic wrap in a figure-of-eight method (Figure 170) or taped in a crisscross weave (Figure 171). During the wrapping or taping, have the victim point his toes and ankle upward by passing a slender rope or strap around the ball of the foot and pulling toward the body (Figure 172). This allows the ankle to be strapped with the foot perpendicular to the leg and the ankle ligaments in the shortened position in which they best heal. A splint can be fashioned from a SAM Splint (see Figures 91 and 92) to provide additional support. If the sprain is severe, splint the ankle as for a fracture. An Aircast Air-Stirrup ankle brace is excellent for in-shoe support.

The Achilles tendon, which runs from the heel into the lower calf, may become irritated or inflamed due to recurrent impact or repetitive stretching, particularly if the heel is not well padded. An inflamed Achilles tendon that is painful should be protected against further irritation by limiting vigorous exercise and using a heel cup or extra padding underneath the heel to reduce stretch forces on the tendon. Achilles tendon rupture is usually caused by a sudden forceful impact on the foot that is “flexed,” with toes pointed down, commonly during a jumping activity. There is pain and a sensation that something has torn or “popped.” The victim has difficulty walking and pushing down with the forefoot. A simple test that can detect a complete Achilles tendon rupture is to have the victim lie face down with the leg bent at the knee. Squeeze his calf and see if the foot moves in such a way that the toes point downward. If there is no motion (in comparison to the uninjured side), the tendon may be ruptured. For treatment, splint the foot and ankle with the toes pointed slightly downward, and try to eliminate weight bearing.

Knee sprain is discussed on page 105.

ARTHRITIS

Arthritis is irritation and inflammation of a joint that can be caused by overuse, infection, or various diseases (such as gout, caused by deposition of uric acid crystals). Symptoms include pain in the joint with motion, swelling (fluid collection), redness, and warmth. If there is an infection within the joint, the condition can rapidly become serious. Generally, people with such infections have high fever, shaking chills, weakness, a recent infection elsewhere in the body, or recent direct injury (often penetrating through the skin) to the joint. Differentiating between an arthritic and an infected joint is often impossible until a physician inserts a needle to see if bacterium-laden fluid or pus is present within the joint, and to obtain fluid for a culture. If infection is a possibility, the victim should be started on dicloxacillin, erythromycin, or cephalexin immediately.

If there is little chance of infection and you know the joint problem is due to overuse, have the victim take aspirin or a nonsteroidal antiinflammatory drug, such as ibuprofen or naproxen. Rest the affected joint, keep it elevated if it is swollen, and adjust goals for the trip accordingly. If the victim is known to have gout and experiences an acute flare, he may be treated with prednisone 60 mg by mouth per day, with a tapering dose over a 10-day period.

Glucosamine and chondroitin are dietary supplements taken by some patients who suffer arthritis or overuse syndromes. These are natural substances reputed to repair and maintain cartilage by suppressing inflammation and stimulating cartilage growth, strength, and resilience. The evidence for benefits is mixed, so that most testimonials are anecdotal. These supplements are generally considered to be safe, but can carry side effects of headache, drowsiness, abdominal pain, constipation, diarrhea, heartburn, nausea, skin rash, insulin resistance, and (rarely) allergic reaction.

VENOUS THROMBOSIS AND THROMBOPHLEBITIS

Thrombophlebitis is inflammation in a vein associated with the development of a blood clot (known as venous thrombosis: “DVT” means deep venous thrombosis). This occurs in conditions of injury to the veins (cuts, bruises), or after periods of prolonged rest in a single position (sitting on a plane, cramped in a cave); it may also be associated with other risk factors (genetic predisposition, pregnancy, tobacco use, cancer, varicose veins). A blood clot irritates the lining of the vein and causes local redness or purplish discoloration, swelling, warmth, and pain. If the clot enlarges, an entire limb length can become affected. These clots are most common in the lower leg, so the calf muscle may be tender to compression. If the clot is in a deep vein, it may break off and travel to the lungs, where it causes a serious condition known as pulmonary embolism (see page 46).

It is easy to confuse the presentation of thrombophlebitis with that of an infection. If you suspect the former, have the victim elevate the limb and apply hot packs or soaks for 60 minutes every 3 hours. Seek immediate medical attention. If you are more than 24 hours from help and not absolutely certain whether you are treating infection or inflammation, administer an antibiotic (dicloxacillin, erythromycin, or cephalexin).

To avoid venous thrombosis: avoid prolonged periods of inactivity; get up and walk around once an hour when traveling on a plane, bus, or train; remain fit, active, and well hydrated; consider support hose if you have varicose veins or a history of blood clot formation in your legs or pelvis; and do not use tobacco products.

BACK PAIN

The most common back injury is muscle strain. Symptoms include muscle pain and spasm adjacent to the vertebrae. If these occur in the lumbar (lower-back) region, treatment consists of maximum rest while lying supine on a firm supporting surface. The knees may be drawn up on a pillow or rolled blanket. All possible lifting and forward bending should be discontinued. The victim should take aspirin or a nonsteroidal antiinflammatory drug to control inflammation, and additional pain medicine as necessary. Gentle massage and alternating applications of ice packs and heat are often soothing. For severe muscle spasm, a physician may prescribe a skeletal muscle relaxant, such as metaxalone (Skelaxin) 800 mg by mouth 3 to 4 times per day.

If one of the cushioning intervertebral (between the vertebrae) disks has been injured (Figure 174), additional symptoms may be noted, which include numbness and/or tingling of parts of the leg (indicating impingement of the disk on a nerve root arising from the spinal cord), shooting pains through the buttocks and posterior leg (indicating irritation of the sciatic nerve [sciatica]), leg weakness, foot drop, constipation, or difficulty with urination. The acute treatment is the same as for muscular back strain.

Lumbar spinal stenosis is a condition where there is narrowing of the spinal canal in such a fashion that nerve roots are compressed on exiting the spinal canal. The most common symptom is discomfort that radiates from the back into the buttocks, thigh(s), and lower leg(s), made worse by arching (extending) the back and lessened by bending (flexing) forward. Sitting usually provides relief, whereas walking and hiking worsen the pain. Exercises in which the person leans forward, such as cycling, may be better tolerated. Treatment is with nonsteroidal antiinflammatory drugs. More severe cases require injection of anesthetic into the space immediately outside the spinal cord, or surgery to widen the bony space(s) through which pass the affected nerve root(s).

Backpacks are the quintessential symbol of trekking and mountaineering. A well-fitted, sturdy and durable backpack gives the user the freedom of the hills. Along with hiking boots, a backpack is essential for any sort of expedition in which someone is responsible for carrying his or her supplies. What is less well known is that a poorly fitted backpack can contribute to significant back pain, inefficient travel, or even the ruin of a trip. A backpack that weighs on its carrier can cause muscle spasm, sore neck and shoulders, numbness and tingling in the hands and fingers, sore hips, and irritated skin.

Features in a backpack that will allow it to fit properly, distribute weight evenly and across the correct body parts, and withstand extremes of environment are, in no particular order: