_Contracted scars_ frequently cause deformity either by displacing parts, such as the eyelid or lip, or by fixing parts and preventing the normal movements--for example, a scar on the flexor aspect of a joint may prevent extension of the forearm (Fig. 63). These are treated by dividing the scar, correcting the deformity, and filling up the gap with epithelial grafts, or with a flap of the whole thickness of the skin.
When deformity results from _depression of a scar_, as is not uncommon after the healing of a sinus, the treatment is to excise the scar.
Depressed scars may be raised by the injection of paraffin into the subcutaneous tissue.
_Painful Scars._--Pain in relation to a scar is usually due to nerve fibres being compressed or stretched in the cicatricial tissue; and in some cases to ascending neuritis. The treatment consists in excising the scar or in stretching or excising a portion of the nerve affected.
_Pigmented or Discoloured Scars._--The best-known examples are the blue coloration which results from coal-dust or gunpowder, the brown scars resulting from chronic ulcer with venous congestion of the leg, and the variously coloured scars caused by tattooing. The only satisfactory method of getting rid of the coloration is to excise the scar; the edges are brought together by sutures, or the raw surface is covered with skin-grafts according to the size of the gap.
_Hypertrophied Scars._--Scars occasionally broaden out and become prominent, and on exposed parts this may prove a source of disappointment after operations such as those for goitre or tuberculous glands in the neck. There is sometimes considerable improvement from exposure to the X-rays.
_Keloid._--This term is applied to an overgrowth of scar tissue which extends beyond the area of the original wound, and the name is derived from the fact that this extension occurs in the form of radiating processes, suggesting the claws of a crab. It is essentially a fibroma or new growth of fibrous tissue, which commences in relation to the walls of the smaller blood vessels; the bundles of fibrous tissue are for the most part parallel with the surface, and the epidermis is tightly stretched over them. It is more frequent in the negro and in those who are, or have been, the subjects of tuberculous disease.
[Ill.u.s.tration: FIG. 106.--Recurrent Keloid in scar left by operation for tuberculous glands in a girl aet. 7.]
Keloid may attack scars of any kind, such as those resulting from leech-bites, acne pustules, boils or blisters; those resulting from operation or accidental wounds; and the scars resulting from burns, especially when situated over the sternum, appear to be specially liable. The scar becomes more and more conspicuous, is elevated above the surface, of a pinkish or brownish-pink pink colour, and sends out irregular prolongations around its margins. The patient may complain of itching and burning, and of great sensitiveness of the scar, even to contact with the clothing.
There is a natural hesitation to excise keloid because of the fear of its returning in the new scar. The application of radium is, so far as we know, the only means of preventing such return. The irritation a.s.sociated with keloid may be relieved by the application of salicylic collodion or of salicylic and creosote plaster.
_Epithelioma_ is liable to attack scars in old people, especially those which result from burns sustained early in childhood and have never really healed. From the absence of lymphatics in scar tissue, the disease does not spread to the glands until it has invaded the tissues outside the scar; the prognosis is therefore better than in epithelioma in general. It should be excised widely; in the lower extremity when there is also extensive destruction of tissue from an antecedent chronic ulcer or osteomyelitis, it may be better to amputate the limb.
AFFECTION OF THE NAILS
_Injuries._--When a nail is contused or crushed, blood is extravasated beneath it, and the nail is usually shed, a new one growing in its place. A splinter driven underneath the nail causes great pain, and if organisms are carried in along with it, may give rise to infective complications. The free edge of the nail should be clipped away to allow of the removal of the foreign body and the necessary disinfection.
_Trophic Changes._--The growth of the nails may be interfered with in any disturbance of the general health. In nerve lesions, such as a divided nerve-trunk, the nails are apt to suffer, becoming curved, brittle, or furrowed, or they may be shed.
_Onychia_ is the term applied to an infection of the soft parts around the nail or of the matrix beneath it. The commonest form of onychia has already been referred to with whitlow. There is a superficial variety resulting from the extension of a purulent blister beneath the nail lifting it up from its bed, the pus being visible through the nail. The nail as well as the raised h.o.r.n.y layer of the epidermis should be removed. A deeper and more troublesome onychia results from infection at the nail-fold; the infection spreads slowly beneath the fold until it reaches the matrix, and a drop or two of pus forms beneath the nail, usually in the region of the lunule. This affection entails a disability of the finger which may last for weeks unless it is properly treated. Treatment by hyperaemia, using a suction bell, should first be tried, and, failing improvement, the nail-fold and lunule should be frozen, and a considerable portion removed with the knife; if only a small portion of the nail is removed, the opening is blocked by granulations springing from the matrix. A new nail is formed, but it is liable to be misshapen.
_Tuberculous onychia_ is met with in children and adolescents. It appears as a livid or red swelling at the root of the nail and spreading around its margins. The epidermis, which is thin and shiny, gives way, and the nail is usually shed.
[Ill.u.s.tration: FIG. 107.--Subungual Exostosis growing from Distal Phalanx of Great Toe, showing Ulceration of Skin and Displacement of Nail.
_a._ Surface view. _b._ On section.]
_Syphilitic_ affections of the nails a.s.sume various aspects. A primary chancre at the edge of the nail may be mistaken for a whitlow, especially if it is attended with much pain. Other forms of onychia occur during secondary syphilis simultaneously with the skin eruptions, and may prove obstinate and lead to shedding of the nails. They also occur in inherited syphilis. In addition to general treatment, an ointment containing 5 per cent. of oleate of mercury should be applied locally.
_Ingrowing Toe-nail._--This is more accurately described as an overgrowth of the soft tissues along the edge of the nail. It is most frequently met with in the great toe in young adults with flat-foot whose feet perspire freely, who wear ill-fitting shoes, and who cut their toe-nails carelessly or tear them with their fingers. Where the soft tissues are pressed against the edge of the nail, the skin gives way and there is the formation of exuberant granulations and of discharge which is sometimes ftid. The affection is a painful one and may unfit the patient for work. In mild cases the condition may be remedied by getting rid of contributing causes and by disinfecting the skin and nail; the nail is cut evenly, and the groove between it and the skin packed with an antiseptic dusting-powder, such as boracic acid. In more severe cases it may be necessary to remove an ellipse of tissue consisting of the edge of the nail, together with the subjacent matrix and the redundant nail-fold.
_Subungual exostosis_ is an osteoma growing from the terminal phalanx of the great toe (Fig. 107). It raises the nail and may be accompanied by ulceration of the skin over the most prominent part of the growth. The soft parts, including the nail, should be reflected towards the dorsum in the form of a flap, the base of the exostosis divided with the chisel, and the exostosis removed.
_Malignant disease_ in relation to the nails is rare. Squamous epithelioma and melanotic cancer are the forms met with. Treatment consists in amputating the digit concerned, and in removing the a.s.sociated lymph glands.
CHAPTER XVIII
THE MUSCLES, TENDONS, AND TENDON SHEATHS
INJURIES: _Contusion_; _Sprain_; _Rupture_--Hernia of muscle--Dislocation of tendons--Wounds--Avulsion of tendon.
DISEASES OF MUSCLE AND OF TENDONS: _Atrophy_; _"Muscular rheumatism"_--_Fibrositis_; _Contracture_; _Myositis_; _Calcification and Ossification_; _Tumours_. DISEASES OF TENDON SHEATHS: _Teno-synovitis_.
INJURIES
#Contusion of Muscle.#--Contusion of muscle, which consists in bruising of its fibres and blood vessels, may be due to violence acting from without, as in a blow, a kick, or a fall; or from within, as by the displacement of bone in a fracture or dislocation.
The symptoms are those common to all contusions, and the patient complains of severe pain on attempting to use the muscle, and maintains an att.i.tude which relaxes it. If the sheath of the muscle also is torn, there is subcutaneous ecchymosis, and the acc.u.mulation of blood may result in the formation of a haematoma.
Restoration of function is usually complete; but when the nerve supplying the muscle is bruised at the same time, as may occur in the deltoid, wasting and loss of function may be persistent. In exceptional cases the process of repair may be attended with the formation of bone in the substance of the muscle, and this may likewise impair its function.
A contused muscle should be placed at rest and supported by cotton wool and a bandage; after an interval, ma.s.sage and appropriate exercises are employed.
#Sprain and Partial Rupture of Muscle.#--This lesion consists in overstretching and partial rupture of the fibres of a muscle or its aponeurosis. It is of common occurrence in athletes and in those who follow laborious occupations. It may follow upon a single or repeated effort--especially in those who are out of training. Familiar examples of muscular sprain are the "labourer"s" or "golfer"s back," affecting the latissimus dorsi or the sacrospinalis (erector spinae); the "tennis-player"s elbow," and the "sculler"s sprain," affecting the muscles and ligaments about the elbow; the "angler"s elbow," affecting the common origin of the extensors and supinators; the "sprinter"s sprain," affecting the flexors of the hip; and the "jumper"s and dancer"s sprain," affecting the muscles of the calf. The patient complains of pain, often sudden in onset, of tenderness on pressure, and of inability to carry out the particular movement by which the sprain was produced. The disability varies in different cases, and it may incapacitate the patient from following his occupation or sport for weeks or, if imperfectly treated, even for months.
The _treatment_ consists in resting the muscle from the particular effort concerned in the production of the sprain, in gently exercising it in other directions, in the use of ma.s.sage, and the induction of hyperaemia by means of heat. In neglected cases, that is, where the muscle has not been exercised, the patient shrinks from using it and the disablement threatens to be permanent; it is sometimes said that adhesions have formed and that these interfere with the recovery of function. The condition may be overcome by graduated movements or by a sudden forcible movement under an anaesthetic. These cases afford a fruitful field for the bone-setter.
#Rupture of Muscle or Tendon.#--A muscle or a tendon may be ruptured in its continuity or torn from its attachment to bone. The site of rupture in individual muscles is remarkably constant, and is usually at the junction of the muscular and tendinous portions. When rupture takes place through the belly of a muscle, the ends retract, the amount of retraction depending on the length of the muscle, and the extent of its attachment to adjacent aponeurosis or bone. The biceps in the arm, and the sartorius in the thigh, furnish examples of muscles in which the separation between the ends may be considerable.
The gap in the muscle becomes filled with blood, and this in time is replaced by connective tissue, which forms a bond of union between the ends. When the s.p.a.ce is considerable the connecting medium consists of fibrous tissue, but when the ends are in contact it contains a number of newly formed muscle fibres. In the process of repair, one or both ends of the muscle or tendon may become fixed by adhesions to adjacent structures, and if the distal portion of a muscle is deprived of its nerve supply it may undergo degeneration and so have its function impaired.
Rupture of a muscle or tendon is usually the result of a sudden, and often involuntary, movement. As examples may be cited the rupture of the quadriceps extensor in attempting to regain the balance when falling backwards; of the gastrocnemius, plantaris, or tendo-calcaneus in jumping or dancing; of the adductors of the thigh in gripping a horse when it swerves--"rider"s sprain"; of the abdominal muscles in vomiting, and of the biceps in sudden movements of the arm. Sometimes the effort is one that would scarcely be thought likely to rupture a muscle, as in the case recorded by Pagenstecher, where a professional athlete, while sitting at table, ruptured his biceps in a sudden effort to catch a falling gla.s.s. It would appear that the rupture is brought about not so much by the contraction of the muscle concerned, as by the contraction of the antagonistic muscles taking place before that of the muscle which undergoes rupture is completed. The violent muscular contractions of epilepsy, teta.n.u.s, or delirium rarely cause rupture.
The _clinical features_ are usually characteristic. The patient experiences a sudden pain, with the sensation of being struck with a whip, and of something giving way; sometimes a distant snap is heard.
The limb becomes powerless. At the seat of rupture there is tenderness and swelling, and there may be ecchymosis. As the swelling subsides, a gap may be felt between the retracted ends, and this becomes wider when the muscle is thrown into contraction. If untreated, a hard, fibrous cord remains at the seat of rupture.
_Treatment._--The ends are approximated by placing the limb in an att.i.tude which relaxes the muscle, and the position is maintained by bandages, splints, or special apparatus. When it is impossible thus to approximate the ends satisfactorily, the muscle or tendon is exposed by incision, and the ends brought into accurate contact by catgut sutures.
This operation of primary suture yields the most satisfactory results, and is most successful when it is done within five or six days of the accident. Secondary suture after an interval of months is rendered difficult by the retraction of the ends and by their adhesion to adjacent structures.
_Rupture of the biceps of the arm_ may involve the long or the short head, or the belly of the muscle. Most interest attaches to rupture of the long tendon of origin. There is pain and tenderness in front of the upper end of the humerus, the patient is unable to abduct or to elevate the arm, and he may be unable to flex the elbow when the forearm is supinated. The long axis of the muscle, instead of being parallel with the humerus, inclines downwards and outwards. When the patient is asked to contract the muscle, its belly is seen to be drawn towards the elbow.
The _adductor longus_ may be ruptured, or torn from the p.u.b.es, by a violent effort to adduct the limb. A swelling forms in the upper and medial part of the thigh, which becomes smaller and harder when the muscle is thrown into contraction.
The _quadriceps femoris_ is usually ruptured close to its insertion into the patella, in the attempt to avoid falling backwards. The injury is sometimes bilateral. The injured limb is rendered useless for progression, as it suddenly gives way whenever the knee is flexed.
Treatment is conducted on the same lines as in transverse fracture of the patella; in the majority of cases the continuity of the quadriceps should be re-established by suture within five or six days of the accident.
The _tendo calcaneus_ (Achillis) is comparatively easily ruptured, and the symptoms are sometimes so slight that the nature of the injury may be overlooked. The limb should be put up with the knee flexed and the toes pointed. This may be effected by attaching one end of an elastic band to the heel of a slipper, and securing the other to the lower third of the thigh. If this is not sufficient to bring the ends into apposition they should be approximated by an open operation.
The _plantaris_ is not infrequently ruptured from trivial causes, such as a sudden movement in boxing, tennis, or hockey. A sharp stinging pain like the stroke of a whip is felt in the calf; there is marked tenderness at the seat of rupture, and the patient is unable to raise the heel without pain. The injury is of little importance, and if the patient does not raise the heel from the ground in walking, it is recovered from in a couple of weeks or so, without it being necessary to lay him up.
#Hernia of Muscle.#--This is a rare condition, in which, owing to the fascia covering a muscle becoming stretched or torn, the muscular substance is protruded through the rent. It has been observed chiefly in the adductor longus. An oval swelling forms in the upper part of the thigh, is soft and prominent when the muscle is relaxed, less prominent when it is pa.s.sively extended, and disappears when the muscle is thrown into contraction. It is liable to be mistaken, according to its situation, for a tumour, a cyst, a pouched vein, or a femoral or obturator hernia. Treatment is only called for when it is causing inconvenience, the muscle being exposed by a suitable incision, the herniated portion excised, and the rent in the sheath closed by sutures.
#Dislocation of Tendons.#--Tendons which run in grooves may be displaced as a result of rupture of the confining sheath. This injury is met with chiefly in the tendons at the ankle and in the long tendon of the biceps.
Dislocation of the _peronei tendons_ may occur, for example, from a violent twist of the foot. There is severe pain and considerable swelling on the lateral aspect of the ankle; the peroneus longus by itself, or together with the brevis, can be felt on the lateral aspect or in front of the lateral malleolus; the patient is unable to move the foot. By a little manipulation the tendons are replaced in their grooves, and are retained there by a series of strips of plaster. At the end of three weeks ma.s.sage and exercises are employed.
In other cases there is no history of injury, but whenever the foot is everted the tendon of the peroneus longus is liable to be jerked forwards out of its groove, sometimes with an audible snap. The patient suffers pain and is disabled until the tendon is replaced. Reduction is easy, but as the displacement tends to recur, an operation is required to fix the tendon in its place. An incision is made over the tendon; if the sheath is slack or torn, it is tightened up or closed with catgut sutures; or an artificial sheath is made by raising up a quadrilateral flap of periosteum from the lateral aspect of the fibula, and st.i.tching it over the tendon.