Three anomalies of the human flexor digitorum superficialis are presented. The normal development of this muscle from the amphibian to the human is discussed and the described anomalies of the muscle in humans classified.

This paper examines the clinical problem of extensor tendon tethering and/or dorsal joint capsule tightening secondary to hand injury. One hundred and forty-one patients were examined 13 to 51 months after hand injuries of varying severity. Fifty-six patients (40%) had suffered simple and eighty-five patients (60%) complex injuries. Seventy-four (52%) of the 141 patients had no extensor tendon tethering and/or dorsal joint capsule tightening. In 30 (21%), the extensor tendon tethering and/or dorsal joint capsule tightening was considered to be "obvious" in that it was easily seen on examination using various commonly used clinical tests of finger flexion and extension. In 37 (26%), the extensor tendon tethering and/or dorsal joint capsule tightening was considered to be of "lesser degree" because it was only evident on application of specific tests which are described in this paper. Of the 37, 21 (56%) described themselves as being unable to make a "proper" fist with the injured hand, 33 (89%) had pain or discomfort on the dorsum of the injured hand and/or fingers on gripping (P < 0.01) and 25 (70%) had weakness of power of gripping (P < 0.01). Thirty-two (87%) complained of functional problems at work, with activities of daily living or with the pursuit of their hobbies.

The role of continuous bupivacaine infusion either into the wound or as a local nerve block, following hand surgery was investigated in 100 patients. After excluding six patients with complex pain problems in whom neither the bupivacaine infusion nor any other conventional analgesic techniques provided adequate analgesia post-operatively, 86 of 94 (91%) patients were adequately treated for post-operative pain by this system during the first night after surgery when pain is presumed to be greatest. This system also provided adequate on-going analgesia for up to 1 week after surgery, controlling nerve pain and allowing mobilization of tendons after tenolysis. Continuous bupivacaine infusion is of particular use in these two groups of patients and after major hand injuries, when considerable pain can be anticipated. Pain during the first night was not controlled adequately by the bupivacaine infusion system in eight of the 94 patients (8%). All eight had a technical failure of the system, which was rectified in six cases to restore adequate analgesia by the infusion system. Two patients developed infection at the infusion cannula insertion site, which occurred only after 1 week and was successfully treated by removal of the cannula and oral antibiotics.

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