1 . Twenty-one cases of poliomyelitis and twenty cases of brachial plexus injury in which muscle transplantations had been performed to restore elbow flexion have been reviewed. The average follow-up period was four and a half years.

2. The results were graded objectively and subjectively. They were better when passive extension of the elbow was limited; such limitation always occurs after Steindler's operation, but infrequently after pectoral transplantation.

3. The results of pectoral transplantation are good when there is no significant shoulder paralysis; if there is shoulder weakness arthrodesis of the joint may be required to control medial rotation and adduction of the shoulder on flexion of the elbow. In brachial plexus lesions the results of pectoral transplantation may be marred by simultaneous contraction of the triceps. This can be overcome by transplanting triceps into the flexor apparatus. Triceps transplantation is rarely indicated because loss of active extension of the elbow is a grave disability.

4. Subjective results tended to be worse than objective results in brachial plexus lesions because impairment of sensibility in the hand often limited the usefulness of the limb. In striking contrast the subjective results were in general far better than the objective in patients who had had poliomyelitis. In them the smallest gain can be of functional value.

We believe that this technique has several advantages. After poliomyelitis recovery in the clavicular head of pectoralis major may exceed that in the sternal head; there may be considerable but incomplete recovery in both heads and it is then desirable to use all the active muscle available. Girls and women dislike conspicuous scars; the incisions used in this technique are unobtrusive when the arm is by the side.

1. Thirteen cases are reported of nerve compression by a ganglion. At operation a connection between the ganglion and the neighbouring joint was established in many instances.

2. It is suggested that so-called ganglia of the nerve sheath and simple ganglia are anatomical varieties of the same entity.

3. The treatment of choice is excision of the ganglion. If this procedure is technically difficult, puncture is advisable.

4. Recovery of sensibility after operation was good. Motor recovery was poor when damage to motor fibres occurred during excision of the ganglion or when paralysis had been present for more than eighteen months.

1. Sixteen cases of thenar paralysis are reviewed in which a bone graft was inserted between the first and second metacarpals to maintain fixed abduction and opposition of the thumb.

2. The technique of the operation is described and the causes of failure are discussed.

3. The operation is intended for those cases in which tendon transplantation to restore active opposition of the thumb is unsuitable. Rotation of the first metacarpal into full opposition is the most important feature of the operation.

1. In the first 1600 of the series of peripheral nerve injuries treated during the years 1940-45 at the Peripheral Nerve Injuries Unit, Oxford, 52 per cent. were due to penetrating wounds, and 6 per cent. of these involved the brachial plexus.

2. A specific method of grouping and grading recovery is described: Group I—lesions of the roots and trunk of C.5, 6; Group II—lesions of the posterior cord; Group III—lesions of C.8, T.1, and the medial cord.

3. The recovery of cases in Group I was good, in Group II fair, and in Group III poor.

4. The brachial plexus was explored on twenty-two occasions. Only in four instances was there interruption of continuity—which is in striking contrast with the frequency in more distal degenerative nerve lesions in open wounds.

5. There is no evidence to suggest that neurolysis influenced motor or sensory recovery, but on one occasion it relieved persistent pain in the limb. In general the correlation between operative findings and prognosis was not precise.

6. With one exception, no recovery of consequence took place in the small muscles of the hand after a lesion in continuity, although galvanic stimulation to all paralysed muscles had been given regularly.

7. There is evidence to suggest that innervation of the biceps may not always be limited to C.5 and 6 and that in a proportion of cases C.7 may make a substantial contribution.

8. In five cases (12 per cent.) Horner's syndrome was present; the causation is discussed.

9. In every case of damage to a main vessel there was a marked tendency to joint stiffness, particularly in the hand, but on one occasion only was there evidence of ischaemic changes in the muscles and nerves.

10. The good spontaneous recovery which occurred in Groups I and II; the poor recovery in Group III even in cases where there was an apparently favourable lesion in continuity; the rarity with which division of nerves was found at operation; and the discouraging results of repair in three cases; make it necessary to conclude that routine exploration of open wounds of the brachial plexus is neither profitable nor justifiable.