Biomedical subjects

C J Bour

Publications and source records attributed to C J Bour.

4 recordsLinked to original sources

PubMed1990

Kinematics of the ulnar carpus related to the volar intercalated segment instability pattern.

Anatomic dissections were done on 18 fresh and 4 preserved cadaver upper extremities to study the pathology of the carpal kinetics and to define the ligaments involved in the volar intercalated segment instability pattern. In a normal wrist, the scaphoid, lunate, and triquetrum all rotate so that their distal surfaces tilt palmarward with radial deviation. With ulnar deviation, all three carpal bones rotate dorsally. In the volar intercalated segment instability pattern, the lunate remains tilted volarly instead of rotating dorsally with ulnar deviation. In this study changes in carpal motion were observed after serially sectioning the ligaments supporting the ulnar carpus before and after loads were applied to the wrist to simulate the dynamic conditions of the wrist. The ligaments were then repaired to help identify which repairs restored normal carpal motion with radial and ulnar deviation with and without axial loads. In these anatomic studies the volar intercalated segment instability pattern occurred when there was instability between both hamate and triquetrum and between the lunate and triquetrum. The main ligaments involved in this instability appeared to be the ulnar half of the volar arcuate ligament and the luno-triquetral ligament as division of these ligaments, particularly under axial loads, produced the most significant change in lunate rotation (p less than 0.05). Similarly repair of these two ligaments produced the most significant correction of lunate position particularly with maintenance of dorsal rotation of the lunate during ulnar deviation under axial loads (p less than 0.01).

Humans↗

PubMed1989

Results of flexor tendon tenolysis after replantation in the hand.

Thirty-seven replanted digital units and four thumb replantations had a flexor tendon tenolysis at an average of 10 months after replantation. The results were assessed by measuring total active motion, potential active motion, and by the formula of Strickland and associates. The total active motion increased from a mean pretenolysis of 72 degrees to 130 degrees. The potential active motion increased from a mean of 43% to 70% after tenolysis. Both of these improvements were statistically significant (p less than 0.001). The formula of Strickland and associates rated 13 excellent, 11 good, 6 fair, and 11 poor. The thumbs had two fair results and two poor results. Poor results were also seen in crush or avulsion amputations, hands with more than two digits amputated, and those requiring a proximal interphangeal joint capsulotomy. Little difference was found related to the number of arteries or tendons repaired. Complications included tendon rupture and infection. No digits were lost. The results of this study would support flexor tendon tenolysis after replantation of fingers but not replanted thumbs.

Adolescent↗

PubMed1988

Intercarpal arthrodesis for static and dynamic volar intercalated segment instability.

Since 1982 seven patients with volar intercalary segment instability (VISI) have been operated on at the Massachusetts General Hospital. All had preoperative wrist pain and described a painful "clunk" with ulnar deviation. In each case there was palpable evidence of instability when the wrist was deviated ulnarly that produced a "buckling" sensation as the distal and proximal rows rotated with ulnar deviation. Arthrograms in six patients and a cineradiography in one patient confirmed that this buckling correlated with volar rotation of the lunate and triquetrum and dorsal rotation of the capitate and hamate. All the patients had some type of intercarpal arthrodesis including four capitate-lunate-triquetrum hamate (CLTH), one lunate-triquetrum (LT), one lunate-triquetrum-hamate (LTH), and one triquetrum-hamate (TH). Surgical findings included the position of the lunate that had rotated on the capitate so that it was tilting volarly and the major ligament instability was between the proximal and distal rows although ligament tears were also present between lunate and triquetrum. Arthrodesis of the proximal and distal rows provided relief of wrist pain in five of six patients. The one patient with the arthrodesis limited to the proximal row had a poor result. Of the five successful cases, the postoperative range of wrist motion was 81 degrees of extension/flexion arc (63% of the normal contralateral) and 35 degrees of radial and ulnar deviation arc (57% of the normal contralateral wrist). The grip strength postoperatively averaged 58 pounds (74% of the normal contralateral side).

Adolescent↗

PubMed1987

The reconstruction of defects in the femoral shaft with vascularized transfers of fibular bone.

Seven major reconstructions of the femoral shaft using a vascularized graft of bone from the fibula were performed at the Massachusetts General Hospital from 1981 to 1984. Three patients had a post-traumatic infected non-union; one, extensive osteomyelitis of the femoral shaft; one, a fractured allograft; one, an atrophic non-union associated with radiation therapy; and one, post-traumatic loss of a ten-centimeter segment of bone. Six of the seven patients had a skeletal femoral defect, ranging from seven to fifteen centimeters in length. The average length of fibula that was used for reconstruction was 19.6 centimeters. Primary skeletal union occurred in five of the seven patients. Two patients had healing only at the distal junction and required a conventional bone graft and supplementary internal fixation of the proximal junction. At an average length of follow-up of thirty-four months, all of the patients were able to walk. Only two patients, both of whom had an extreme limb-length discrepancy, required additional support.

Adolescent↗