Metacarpophalangeal joint implants. I. Roentgenographic study on the silastic finger joint implant, swanson design.

A roentgenographic study was carried out on 104 Silastic Finger Joint Implants, Swanson design. Sixty-two of the implants were examined in the anterio-posterior-projection (AP) from 4 months to 5 1/2 years postoperatively, a total of 116 examinations. Forty-two implants were examined in the AP-projection and in the lateral projection by tomography in maximum active extension and flexion from 9 days to 42 months postoperatively, a total of 110 examinations. Stem fractures were found in 11/104 implants: two of these preceded by a laceration of the implant surface visualized by tomography. Fragmentation of the midsection was found in 14/104 implants. Cortical erosion was seen radially in the phalanx and the metacarpal bone in some joints showing ulnar deviation, predominantly MCP joints II and III. On the tomograms a cortical erosion dorsally in the metacarpal bone could be demonstrated. Particularly around the distal stem was found an intramedullary bone lamella, varying in distance from the stem as well as in density and regularity. Bone resorption was found at the site where the midsection bore on the metacarpal bone and the proximal phalanx, resulting in a migration of the implant in a proximal and/or distal direction. The migration of the implant was evaluated on the tomograms with maximum active extension and classified into 4 Grades. Concomitant with the migration in the proximal direction a bony spur developed volarly at the resected end of the metacarpal bone, also seen in the AP-projection. The degree of maximum joint flexion was measured on the tomograms by drawing a line along the dorsal contour of each bone. In some cases flexion was found to decrease as a consequence of implant migration in the distal direction or the development of a bony spur. In several cases the range of flexion was maintained by gliding of the stems, particularly the distal one.

[1]  C. R. Coleman,et al.  Etiology of Congenital Dislocation of the Hip: An Experimental Approach To The Problem Using Young Dogs , 1963 .

[2]  J. Charnley.  BIOMECHANICS IN ORTHOPAEDIC SURGERY , 1965 .

[3]  E. M. Smith,et al.  Flexor forces and rheumatoid metacarpophalangeal deformity. Clinical implications. , 1966, JAMA.

[4]  Measurement of the deformity in scoliosis. , 1968, Acta orthopaedica Scandinavica.

[5]  A. Swanson.  Silicone Rubber Implants for Replacement of Arthritic or Destroyed Joints in the Hand , 1968 .

[6]  J Lindström,et al.  Intra-osseous anchorage of dental prostheses. I. Experimental studies. , 1969, Scandinavian journal of plastic and reconstructive surgery.

[7]  [Arthoplasty of the hand with silicone implants]. , 1970, Chirurgie; memoires de l'Academie de chirurgie.

[8]  The choice of arthroplasty in rheumatoid surgery. , 1971, Acta orthopaedica Belgica.

[9]  Arthroplasty of the Metacarpophalangeal Joints , 1971, The Hand.

[10]  [Metacarpophalangeal arthroplasties with silicone implants]. , 1971, Annales de chirurgie.

[11]  H Willenegger,et al.  [Primary and secondary healing of bone fractures]. , 1971, Der Chirurg; Zeitschrift fur alle Gebiete der operativen Medizen.

[12]  Experimental Silastic implants in small joints. , 1971, Clinical orthopaedics and related research.

[13]  Early experience with the silicone rubber prosthesis (Swanson) in the reconstructive surgery of the rheumatoid hand. , 1972 .

[14]  A. Swanson.  Flexible Implant Resection Arthroplasty , 1972, The Hand.

[15]  A. Swanson,et al.  In vivo testing of silicone rubber joint implants for lipid absorption. , 1972, Journal of biomedical materials research.

[16]  R. Carmen,et al.  Lipid absorption by silicone heart valve poppets—in‐vivo and in‐vitro results , 1972 .

[17]  M. Robinson.  Bone resorption under plastic chin implants. Follow-up of a preliminary report. , 1972, Archives of otolaryngology.

[18]  Quantitative results following implant arthroplasty of the proximal finger joints in the arthritic hand. , 1972, Clinical orthopaedics and related research.

[19]  S. Simon,et al.  Environmental fatigue testing of silastic finger joint prostheses. , 1972, Journal of biomedical materials research.

[20]  Bone contouring under silicone polymer implants. , 1972, Clinical orthopaedics and related research.

[21]  A. Swanson,et al.  Flexible implant arthroplasty for arthritic finger joints: rationale, technique, and results of treatment. , 1972, The Journal of bone and joint surgery. American volume.

[22]  [Swanson's finger joint prosthesis]. , 1973, Verhandlungen der Deutschen Gesellschaft fur Rheumatologie.

[23]  Swanson Ab.  Implant resection arthroplasty of the proximal interphalangeal joint. , 1973 .

[24]  [Joint prosthesis of the hand]. , 1973, Handchirurgie.

[25]  L. Millender,et al.  Metacarpophalangeal joint arthroplasty utilizing the silicone rubber prosthesis. , 1973, The Orthopedic clinics of North America.

[26]  Silicone rubber arthroplasties of the hand. , 1973, Radiology.

[27]  [Follow-up results of the Swanson finger joint endoprostheses and St. Georg models]. , 1973 .

[28]  L. Vistnes,et al.  BONE DEFORMATION BENEATH ALLOPLASTIC IMPLANTS , 1973, Plastic and reconstructive surgery.

[29]  A. Swanson.  Flexible implant resection arthroplasty in the hand and extremities , 1973 .

[30]  Roentgenographic examination of the metacarpophalangeal joint. , 1975, Scandinavian journal of plastic and reconstructive surgery.