CHAPTER XIII.
TENOTOMY
For convenience' sake I group under this one head certain operations used for the relief of distortion, in which muscles or tendons are divided subcutaneously. Since the discovery of the principle by Delpech, and the application of it by Stromeyer, Dieffenbach, Little, and countless successors, it has been used for very many cases for which it is totally inapplicable, e.g. for the division of the muscles of the back in spinal curvature. Still there remain several deformities for the relief of which subcutaneous tenotomy is a most important remedy; chief among these are Wry Neck and Club-foot.
Operation for Wry Neck.—Subcutaneous section of the sterno-mastoid.—In what cases of wry neck is this operation suitable? In those only in which the muscles are the starting-point of the mischief. These are sometimes congenital, more frequently they commence in childhood. In cases where the distortion depends on disease of the cervical vertebræ, or is secondary to curvature of the spine, division of the muscle is worse than useless.
Operation.—A tenotomy knife, which should be sharp-pointed, narrow in the blade, with a blunt back, should be introduced through the skin a little to one side of the sternal portion of the affected muscle, passed along with its flat edge between the skin and the tendon, till it has fairly crossed the tendon; the blade should then be turned so that by a gradual sawing motion the edge may be made to divide the tendon about an inch above the sternum. A distinct snap will then be felt or heard, and the position of the head will be at once much improved. Exercise, warm bathing, and rubbing, will generally suffice to complete the cure, without it being necessary to call in the aid of the instrument-maker with his expensive apparatus.167
Operations for Club-Foot.—The following are the tendons which may require division in the cure of club-foot, and the operations for their division.
1. The tendo Achillis.—There are very few cases of true club-foot which can be successfully treated without division of the tendo Achillis. While in talipes equinis it is generally the only disturbing agent, in talipes varus and valgus it invariably increases and maintains the deformity, which the tibiales or peronei seem to originate.
Operation.—The foot being held at about a right angle with the leg, the operator should pinch up the skin over the tendon, introduce the knife flatwise, a little to one side of the tendon, till its point is nearly projecting at the other, then turn the edge on the tendon and cut inwards with a sawing motion till the tendon gives way with a distinct snap, and the foot can be completely flexed with ease.
Dr. Little168 recommends that the tendon should be divided from before backwards. There is more risk by this method of wounding the skin, and thus losing the subcutaneous character of the operation.
Professor Pancoast169 divides the inferior portion of the soleus muscle instead of the tendo Achillis.
2. Tibialis posticus.—Next in frequency and importance to that of the tendo Achillis, division of this tendon is much more difficult to perform. It may be performed either above or below the ankle.
(a.) Above the ankle.—The blade of a tenotomy knife should be entered perpendicularly at the posterior margin of the tibia, half an inch or an inch above the internal malleolus, so as to pass between the bone and the tendon of the tibialis posticus, the blade directed towards the latter; the assistant should now evert the foot, the operator pressing the blade against the tendon.170
(b.) Below the ankle, close to the attachment to the scaphoid. This is the better position of the two when the position of the tendon can be made out, which is not always the case, especially in cases of old standing.
Raising the skin just over the astragalo-scaphoid joint, the knife should be entered with its blade downwards, and across the tendon, and should be made to cut on the bone, while an assistant everts the foot till the tendon gives way with a distinct snap.
3. Tibialis anticus may in like manner be divided either just above the ankle, or at its insertion. When it requires division it can generally be made so prominent as to render its division comparatively easy.
4. Peronei.—These do not often require division, cases of talipes valgus being usually paralytic in character. If necessary they can be cut as they cross the fibula.
5. The plantar fascia, may require division; when this is the case, it is so prominent as to render the operation very easy, if conducted on the principles mentioned above.
CHAPTER XIV.
OPERATIONS ON NERVES
Nerve-stretching.—Surgical literature in last ten years is full of cases in which nerves have been stretched for all manner of diseases with varying success: an example of the operative procedure may suffice:—
1. Stretching of the great sciatic either for sciatica, sclerosis, or locomotor ataxia.
Operation.—A line drawn from the centre of the space between the tuberosity of the ischium or the great trochanter to a corresponding point between the condyles of the femur will give the direction. A free incision in this line three or four inches in length—the nerve lies just below the the femoral aponeurosis, beneath the edge of gluteal fold, requiring no muscular fibres to be divided. It must be raised from its bed and boldly stretched or elongated into a loop. Symington's experiments have shown that in the average adult 130 lb. are required to break the nerve.
2. The facial has been stretched for spasm. The trunk is easily reached by an incision extending from near the external auditory meatus to the angle of the jaw, which enables the parotid to be pushed forward and the edge of the sterno-mastoid pulled backwards.
Neurotomy and Neurectomy.—Chiefly performed for neuralgia of the fifth nerve.
a. This is a very easy operation if directed at the terminal branches only of the nerve, where they make their exit from the frontal, supraorbital, and mental foramina. The author has done it in very numerous cases, and with great relief, if care be taken to destroy the nerve in the foramen to some extent—a sharp-pointed thermo-cautery does this easily and safely.
b. The more severe and radical operation of cutting out a portion of the trunk of the fifth nerve just after it has left the skull, and destroying Meckel's ganglion, has been done pretty frequently, chiefly by American surgeons—in various ways.
1. Carnochan's Operation.—Exposing the whole front wall of antrum, its cavity is opened into from the front by a large trephine. The lower wall of the infra-orbital canal is cut away by a chisel, the posterior wall of the antrum by a smaller trephine, the nerve thus isolated is traced up to and past Meckel's ganglion, which is removed close to the foramen rotundum by cutting the nerve by curved blunt-pointed scissors.
2. Pancoast's Operation.—Expose the coronoid process by a free incision, divide it at its root and throw it up, then expose and tie internal maxillary artery, after which the upper portion of the external pterygoid is to be detached from the sphenoid, thus exposing the nerve leaving foramen ovale; the second portion is deeper and not so easily got at.
3. The spinal accessory occasionally may be divided before it enters the sterno-mastoid in cases of spasmodic wry neck, with great advantage. This operation is an easy one; the sterno-mastoid edge being once fairly exposed, the nerve is easily seen, and a piece should be cut out at least half an inch in length.
Nerve Suture is occasionally practised with great advantage in cases where nerves have been divided either by accident or in operation. Catgut seems to be the best medium, and cases are on record in which, even after months of separation and subsequent paralysis, improvement has followed an operation for refreshing and joining the divided ends.
ADDENDUM TO CHAPTER IX
Dr. Solis Cohen has recently (in a paper read before the Philadelphia College of Physicians, April 4, 1883) collected the notes of sixty-five cases of excision of the entire larynx. Fifty-six of these were done for cancer, and the remainder for sarcomata, papillomata, etc. Of the fifty-six done for cancer, forty are reported as having died, either shortly after the operation from shock or pneumonia, or a few months later from recurrence of the disease. In two instances the disease had recurred, but death had not been reported when the paper was read. Fourteen remain in which neither death nor recurrence had been reported. Dr. Cohen's conclusion is that laryngectomy does not tend to the prolongation of life, and thinks that the greatest good to the greater number appears better secured by dependence on the palliative operation of tracheotomy.