A Histological Evaluation of Rabbit Tendons Sutured Using the Bunnell Pattern

Development of ischemia in healing tendons was assessed in 18 rabbits. One superficial digital flexor tendon in each rabbit was incised and anastomosed using a Bunnell pattern. The repair site was enclosed in a porous, woven Dacron tube before skin closure. The limb was immobilized with a cast. Rabbits were euthanized 1, 4, and 8 weeks after surgery, and tendons were harvested and examined microscopically. Regions of the tendon included in the suture pattern were ischemic and acellular at 1 week, while adjacent areas still containing patent vessels remained viable. Within 4 weeks, a well vascularized neotendon with collagen bundles organized parallel to the long axis of the tendon developed along the periphery and between the opposed tendon ends. After 8 weeks, the ischemic regions of the tendon had not revascularized or become integrated with the neotendon. Adjacent collagen bundles not originally included in the Bunnell pattern were integrated with neotendon collagen fibers.

[1]  W H Akeson,et al.  Flexor tendon healing and restoration of the gliding surface. An ultrastructural study in dogs. , 1983, The Journal of bone and joint surgery. American volume.

[2]  B. Nyström,et al.  Separation of tendon ends after suture of achilles tendon. , 1983, Acta orthopaedica Scandinavica.

[3]  S. Woo,et al.  Effects of early intermittent passive mobilization on healing canine flexor tendons. , 1982, The Journal of hand surgery.

[4]  S. Woo,et al.  The importance of controlled passive mobilization on flexor tendon healing. A biomechanical study. , 1981, Acta orthopaedica Scandinavica.

[5]  H E Kleinert,et al.  Flexor tendon injuries. , 1981, The Surgical clinics of North America.

[6]  A. Zbrodowski,et al.  Vascularization and anatomical model of the mesotendons of the extensor digitorum and extensor indicis muscles. , 1980, Journal of anatomy.

[7]  P. Matthews.  The Pathology of Flexor Tendon Repair , 1979, The Hand.

[8]  A. Goodship,et al.  Tendon injuries and their treatment in the horse , 1979, Veterinary Record.

[9]  D. Pennington.  The Locking Loop Tendon Suture , 1979, Plastic and reconstructive surgery.

[10]  N. Martin,et al.  EXPERIMENTAL EVALUATION OF FACTORS AFFECTING THE STRENGTH OF TENDON REPAIRS , 1977, Plastic and reconstructive surgery.

[11]  J. Matthews.  Vascular changes in flexor tendons after injury and repair: an experimental study. , 1977, Injury.

[12]  G. Lundborg.  The microcirculation in rabbit tendon. In vivo studies after mobilisation and transection. , 1975, The Hand.

[13]  M. Wolf,et al.  Vascularization of the healing wound. , 1974, The American surgeon.

[14]  L. Bergljung.  Vascular Reactions in Tendon Healing , 1970, Angiology.

[15]  W. K. Lindsay,et al.  Digital flexor tendons: an experimental study. Part II. The significance of a gap occurring at the line of suture. , 1960, British journal of plastic surgery.