Common Calcaneal Tendon Research Articles

Biomechanical Comparison of Transosseous Four-strand Tendon Suture Patterns for Repair of Ruptured Distal Common Calcaneal Tendon: An Ex Vivo Study in Dogs

Biomechanical Comparison of Transosseous Four-strand Tendon Suture Patterns for Repair of Ruptured Distal Common Calcaneal Tendon: An Ex Vivo Study in Dogs

Minimally invasive dorsal transarticular tibio‐metatarsal plate for temporary hock immobilisation in two dogs and a cat

AbstractThree patients (one cat and two dogs) underwent dorsal transarticular tibio‐metatarsal plate, applied minimally invasively with two small incisions, as a temporary immobilisation of the hock following common calcaneal tendon repair. There were no clinical complications associated with the transarticular plate. In one patient, the distal screws had loosened as an incidental finding; ensuring screws are bi‐cortical may reduce the risk of this occurrence. All patients regained full tarsocrural range‐of‐motion. Application and removal of the plate does not interfere with the repair of the common calcaneal tendon, and the calcaneus is left available for application of implants to facilitate tendon repair if required.

Loop modification of the traditional three-loop pulley pattern improves the biomechanical properties and resistance to 3-mm gap formation in a canine common calcanean teno-osseous avulsion model.

To compare the biomechanical properties and gapping characteristics following loop modification of a 3-loop-pulley (3LP) pattern in an ex vivo canine common calcaneal tendon (CCT) avulsion repair model. 56 skeletally mature hindlimbs from 28 canine cadavers. The CCTs were randomized to 1 of 4 experimental groups (n = 14/group) then sharply transected at the teno-osseous junction. Groups consisted of a 3LP, 4-loop-pulley (4LP), 5-loop-pulley (5LP), or 6-loop-pulley (6LP) pattern with loops placed 60° apart using size-0 polypropylene. Yield, peak, and failure loads, construct stiffness, loads to produce a 3-mm teno-osseous gap, and failure mode were evaluated and compared between groups. Yield (P = 0.001), peak (P < 0.001), and failure loads (P < 0.001), construct stiffness (P < 0.001), and loads to 3-mm gap formation (P = 0.005) were all significantly greater for 6LP compared to all other groups. Mode of failure did not differ among groups (P = 0.733) with 75% (42/56) of repairs failing by mechanism of core sutures pulling through the tendinous tissue. Pattern modification by increasing the number of loops increased the repair site strength by 1.4, 1.6, and 1.8 times for 4LP, 5LP, and 6LP compared to 3LP, respectively. Increasing the number of suture loops compared to a traditional 3LP repair is a relatively simple technique modification that significantly increases teno-osseous repair site strength and loads required to cause 3-mm gap formation. The results of this study justify further focused investigation of increasing the number of suture loops in vivo for teno-osseous CCT repair in dogs.

Use of platelet-rich plasma as an adjuvant in the surgical treatment of common calcaneal tendon rupture in cats

La Revista U.D.C.A Actualidad & Divulgación Científica es una revista multidisciplinar, arbitrada, de acceso abierto y de producción continua que tiene como propósito evaluar, publicar y difundir los resultados de la investigación principalmente de la región iberoamericana y de las otras regiones tropicales y subtropicales. Con el propósito de facilitar el acceso y la apropiación de la producción científica, la revista publica los artículos en español, inglés o portugués. La mayoría de los documentos que publica corresponden a artículos científicos, sin embargo, también edita artículos de reflexión, de revisión, reporte de casos y notas técnicas. La revista cuenta con una trayectoria de más de 20 años y se encuentra indexada en: Scopus, Chemical Abstracts, CAB Abstract, Índice Bibliográfico Nacional Publindex clasificada en “B” Convocatoria No.910 de 2021, SciELO Colombia, Reseñada en Latindex e incluida en la base de datos Periódica UNAM, México, en el Directory of Open Access Journals-DOAJ, y en la Red Iberoamericana de Innovación y Conocimiento Científico-REDIB. La gratuidad para el autor y el lector obedece al apoyo financiero de la Universidad de Ciencias Aplicadas y Ambientales y a la colaboración desinteresada de los evaluadores externos. ISSN en línea: 2619-2551 ISSN impreso: 0123-4226 DOI: https://doi.org/10.31910/rudca.01234226

Use of a Transarticular Calcaneo-Tibial Locking Plate for Temporary Immobilization of the Tarsocrural Joint following Surgical Repair of Common Calcaneal Tendon Rupture in Eight Dogs.

The purpose of this clinical communication is to report the management of common calcaneal tendon rupture in dogs using a transarticular calcaneo-tibial locking plate as a method of temporary immobilization of the tarsocrural joint to support primary repair of the common calcaneal tendon. Dogs presented with partial or complete common calcaneal tendon rupture treated with primary tendon repair supported by the transarticular calcaneo-tibial locking plate technique from July 2016 to December 2019 were included. The tarsus was placed at a standing angle of 150 degrees and the pre-contoured Fixin locking 'L' or 'T' plate was medially applied with two locking screws inserted in the calcaneus and two screws inserted in the distal tibia. Tendon healing judgement was mostly based on clinical palpation and ultrasound examination was not performed in all the cases. Plates were removed in all dogs 6 weeks postoperatively. All tendons healed and no complications at the level of the tenorrhaphy were noted in the postoperative period. All dogs returned to hunting activity with full function of the affected limb. No major complications requiring revision surgery were observed. Minor complications occurred in two cases; osteomyelitis and screw pull-out. The use of a transarticular calcaneo-tibial locking plate for temporary immobilization of the tarsocrural joint after surgical repair of common calcaneal tendon rupture appears to be an effective technique with comparable results to other reported techniques.

Calcaneotibial screws for immobilisation of the tarsocrural joint of dogs in extension: effect of the angle of screw placement on the force to failure in a canine cadaveric model

ABSTRACT Aims To compare the force to failure under axial loading of a calcaneotibial screw placed approximately perpendicular to the tibia with that of a screw placed perpendicular to the calcaneus, when used to immobilise the tarsus in an ex vivo canine model. Methods Twelve pairs of cadaveric hindlimbs from large breed dogs, without orthopaedic or soft tissue disease, were prepared by transecting the limb at the level of the stifle and stripping the limbs of all musculature from the stifle to mid-metatarsus, including removal of the common calcaneal tendon from all limbs. The limbs in each pair were randomly assigned to receive a calcaneotibial screw placed perpendicular to the long axis of either the calcaneus (C group) or the tibia (T group) with the tarsus in full extension. The distal limb was potted in resin and the proximal tibia was pinned to allow biomechanical testing in compressive loading. Testing was performed to apply an axial load using a material testing machine in a proximodistal direction through the tibia, advancing at a rate of 10 mm/second. The force to failure was recorded in kN and compared between groups. Results The median force to failure of the C group was 0.86 (min 0.50; max 1.64) kN which was higher than the T group which had a median force to failure of 0.74 (min 0.26, max1.05) kN (p = 0.004). All modes of failure were by screw pull-out. Conclusions A calcaneotibial screw placed at an angle approximately perpendicular to the long axis of the calcaneus, has a higher force to failure under axial loading than a calcaneotibial screw that is placed at an angle approximately perpendicular to the tibia, in a canine cadaveric model. Clinical relevance A temporary calcaneotibial screw is a common method of immobilising the tarsus in extension to protect primary repair of a common calcaneal tendon injury. Placing a calcaneotibial screw perpendicular to the calcaneus may be a more reliable option for immobilisation of the tarsus to protect a common calcaneal tendon repair compared to screws placed perpendicular to the tibia. However extrapolation of these results into a clinical setting requires caution.

Successful calcaneal common tendon tenorrhaphy in a Dorper lamb

AbstractTendon rupture is an uncommon cause of lameness in small ruminants. This report aimed to present a successful common calcaneal tendon (CCT) tenorrhaphy in a Dorper lamb after rupture during a tail docking procedure. The lamb presented a 3.5 cm linear open wound over CCT. During surgery, an incision was made over the skin on the caudolateral aspect of the distal tibia over CCT. The tendon stumps were isolated using haemostats, repair was performed via a locking‐loop suture pattern using non‐absorbable suture material. Postoperative limb immobilisation was conducted using a full‐limb compressive bandage and a modified Schroeder–Thomas splint, and follow‐up continued for 4 weeks. Ten months postsurgery, a fibrous callus was evident and the lamb exhibited no lameness. In this report, CCT tenorrhaphy using non‐absorbable suture in a locking‐loop pattern was a successful approach. Limb immobilisation in extension and specific physiotherapy are important methods to fasten the patient's rehabilitation.

Serial Ultrasonographic and Real-Time Elastosonographic Assessment of the Ovine Common Calcaneal Tendon, after an Experimentally Induced Tendinopathy.

Real-time elastosonography (RTE) is a recently described, non-invasive, ultrasonographic technique developed to assess tissue elasticity. The main aim of this study was to investigate the ultrasonographic and elastosonographic appearance of the common calcaneal tendon (CCT) in an ovine model, and to monitor the progression of tendon healing after an experimentally-induced tendinopathy. Sound tendons were initially evaluated (T0) with a caliper and by a single operator with ultrasound. Ultrasonographic and elastosonographic images were then acquired. Subsequently, ultrasound-guided tendon lesions were induced by injecting 500 IU of Type IA collagenases proximally to the calcaneal tuberosity. Caliper measurement, ultrasonography and elastosonography were then repeated at 15 (T1), 30 (T2) and 60 (T3) days. Clinically measured width of the tendon, ultrasonographic thickness and width and percentage of hard (Elx-t%hrd) and soft (Elx-t%sft) tissue were recorded. Statistical analysis was performed on the data collected; statistical significance was set at p < 0.05. Intra-class correlation coefficient (ICC) revealed good (0.68) repeatability of elastosonographic evaluation of the CCT. The tendon width was significantly increased when comparing T0 with T1–2 and decreased when comparing T1–2 with T3. Ultrasound-assessed thickness was significantly increased between T0–T1 and decreased between T1-T2–3. Elx-t%hrd was significantly decreased at T1–2–3 and Elx-t%sft was significantly increased at T1–2–3. In conclusion, the ovine CCT is a highly stiff structure that undergoes a severe loss of stiffness during the healing process. Thickness and width of the tendon increased during the first 30 days and then reduced progressively along the subsequent 30 days. Ultrasonographic appearance of the tendon remained severely abnormal and the tendon showed severely reduced elastic proprieties 60 days after lesion induction.

Temporary Application of a Tarsal Arthrodesis Plate as a Postoperative Immobilization Technique in Common Calcaneal Tendon Injury Repair in Dogs: A Pilot Study

Objective: To determine if the temporary application of a pantarsal arthrodesis plate would provide adequate postoperative tarsal immobilization after calcaneal tendon repair and to identify complications compared to an established technique. Study Design: This was a single institution retrospective pilot study. Medical records of dogs from January 2008 through September 2019 that presented for common calcaneal tendon injury and underwent surgical repair were reviewed. Exclusion criteria included cases that had incomplete medical records or had insufficient follow up. 17 calcaneotibial (CT) screw and 10 temporary tarsal arthrodesis plate (TTAP) cases were included in the final analysis. Data collected included signalment, pertinent history, injury type, surgical technique, duration of postoperative immobilization, major postoperative complications that warranted a second procedure, and follow up time. Results: The major complications in the CT screw group were tendon re- injury (n=5), surgical site infection (n=1), and tendon laxity (n=1). The major complication in the plate group was tendon laxity (n=1). The median follow up time after initial surgery was 171 (range 36-1670) and 185 (range 57-567) days for the CT screw and TTAP groups, respectively. Conclusion: The results from this pilot study suggest that a TTAP is an acceptable method for postoperative immobilization after primary calcaneal tendon repair. Further research is warranted to validate this procedure.

Tenorrafia calcânea pós-trauma associada ao uso de placa e fixador esquelético externo em cão: relato de caso

The common calcaneal tendon is one of the most injured tendons in dogs. Regardless the cause, if untreated, the injury may increase permanently compromising the injured limb function. This is a case reported in a seven years old, male, 31.5 Kg, very hecticbehavior, Labrador dog. The dog had been suffered a cut by walking on a wasteland. At the clinical examination, he presented claudication, knee hyperextension and tarsal hyperflexion. At the common calcaneal tendon palpation, a loss of continuity was realized characterizing a rupture. The injury was surgically treated by approximating the tendon ́s stumps. Aiming to reduce the tension over the tendon, a plaque was sutured in the tendon caudal surface and the tarsocrural joint was temporarily immobilized. The calcaneal tenorrhaphy with modified Kessler suture associated to an orthopedical plaque and external skeletal fixative showed to be efficient to promote a dog ́s common calcaneal tendon early repairing. The healing occurred by first intention and the injured limb had a deambulatory restoration even in the first postoperative week. Such conducts have also to be considered in calcaneal tenorrhaphies in active, heavy and/or uncooperative patients.

Sonoelastography of Normal Canine Common Calcaneal Tendon: Preliminary Results

AbstractShear wave elastography (SWE) is a feasible and newly developed ultrasonographic technique which is able to assess elasticity of tissues. The aim of this work was to assess the feasibility of SWE on the normal canine common calcaneal tendon (CCT) evaluating the intra-operator repeatability and reproducibility of single measurements and stiffness of different anatomic CCT portions was examined. Tendons were first evaluated with B-mode ultrasound with a linear probe 8.5 to 10 MHz in longitudinal section with slight flexed tarsocrural joint and a gel-pad. Common calcaneal tendon was divided into three different anatomical regions. Shear wave elastography was performed in each region by two operators and quantitative evaluation (m/s and kPa) was performed on the most representative images. Region of interest (0.15 cm) was settled. Intraclass correlation coefficient (ICC) results were classified using the following scale: 0.00 to 0.20 = poor; 0.20 to 0.40 = fair; 0.40 to 075 = good; &gt;0.75 = excellent. Ten adult dogs were enrolled. Intra-operator ICC values were &gt;0.75 for both operators in every tendon portion. Inter-operator SWE ICC values for m/s measurements were 0.3, 0.61 and 0.61 for the enthesis, intermediate portion and the myotendinous junction respectively; for kPa measurements, values were respectively 0.3, 0.7 and 0.81. The three CCT portions were significantly different in stiffness (p-value &lt; 0.001 for both m/s and kPa measurements). These preliminary results provide evidence that SWE is potentially appliable to assess mechanical properties of canine CCT affected by tendinopathies.

Rheological Properties and Growth Factors Content of Platelet-Rich Plasma: Relevance in Veterinary Biomedical Treatments.

Platelet-rich plasma (PRP) is a nontransfusional hemocomponent, considered as a powerful concentrate of growth factors (GFs) therapeutically used to stimulate tissue regeneration. The use of autologous PRP, as the patient’s own biological material, for therapeutic purposes represents a safe and effective alternative to conventional treatments in both human and veterinary medicine. The aim of this study was the characterization of canine PRP from rheological and biological points of view. Thus, a characterization of the viscoelastic properties of the PRP systems was performed in order to clarify the influence of different calcium concentrations, in the presence of autologous thrombin-rich solution, on the PRP gels’ mechanical properties, from which the applicability of these systems in biomedical treatments is strongly dependent. Then, an evaluation of the content of GFs in PRP, activated or not with thrombin, and stored at different temperatures (37 °C and −20 °C) was performed over time, outlining, for the first time, the importance of the effect of physiological temperature (37 °C) on the production of GFs. A clinical case study conducted in a dog with a complete rupture of the common calcaneal tendon (Achilles tendon) confirmed the relevance of this hemocomponent in the daily veterinary clinical activity and the potential translational value for human health.

Corrective osteotomy and partial tarsal arthrodesis in two greyhounds with calcaneal malunion

To describe the clinical presentation and outcome of two greyhounds with calcaneal malunions that were treated with corrective osteotomy and partial tarsal arthrodesis. Short case series. Two adult racing greyhounds. Varus and recurvatum deformity of the calcaneus was ascribed to malunion of prior calcaneal fracture with concomitant central bone fracture that had been sustained during racing in both dogs. Both dogs exhibited severe, weight-bearing lameness and had radiographic evidence of moderate to severe osteoarthritis of the proximal intertarsal joint. A closing wedge corrective osteotomy and partial tarsal arthrodesis were performed with a 2.7-mm locking compression plate and cancellous autograft. Calcaneal morphology and alignment of the common calcaneal tendon seemed restored postoperatively. The implant was removed in one dog, while the other dog experienced no postoperative complications. Lameness improved in both dogs, although residual intermittent lameness after heavy exercise was reported by owners of both dogs 1 year after surgery. Overall, owner satisfaction and outcome were considered good-to-excellent in both dogs. Corrective osteotomy and partial tarsal arthrodesis for treatment of malunited calcaneal fractures may be considered in dogs with clinical signs related to calcaneal malunion.

Terapia Neural no tratamento de ruptura de tendão calcâneo comum canino: relato de caso

Neural Therapy (NT) is considered an integral therapy that helps in reorganizing the body so that it restores its state of balance and self-healing. One of the objectives is to restore the potential of the cell membrane, which is why it is indicated for numerous diseases. It is a technique used to eliminate disorders caused by several factors and is based on the use of local anesthetics, in low concentrations. The expected effect of using the local anesthetic in NT is to stimulate the electrical properties of the cell, restoring the physiological potential and the energetic activity of the organism. The reported case aims to demonstrate the effectiveness of Neural Therapy in healing a dog's Common Calcaneal Tendon. This is a condition commonly caused traumatically by sharp objects or direct trauma, which can cause major impairment of locomotor function if there is no adequate intervention.

Histopathological analysis of the inflammatory response of two invasive techniques in the calcaneal tendon of a mouse

Abstract Background and Aim Percutaneous needle electrolysis (PNE) is a therapeutic tool which has demonstrated its effectiveness of the treatment of tendinopathies and muscle problems. Previous authors have based the therapeutic effect of the same on the ability to provoke an important inflammatory response. However, there is a scarcity of basic research directed at understanding its effects on a cellular and histological level. The aim of this study was to histopathologically compare the inflammatory response provoked by PNE versus dry needling (DN) in a healthy animal model. Material and Methods For the proposed study aim a murine model was used with a total of 18 C57BL/6J mice. All animals received an application of DN in the left common calcaneal tendon, whereas on the right, treatment with PNE was applied (3 impacts of 3mA during 3 seconds). Groups of animals were sacrificed at 3, 7 and 15 days to evaluate the histopathological evolution of the lesions. Samples of the common calcaneal tendon were taken and fixed in commercial formalin at 4% tamponed during 24 hours, processed and included in paraffin blocks. Sections of 3 microns thick were performed which were dyed with hematoxylin-eosin for conventional histopathological examination. Results Dry needling of the common calcaneal tendon induced the presence of an acute inflammatory infiltrate (characterized by the presence of polymorphonuclear neutrophils and macrophages) in the peritenon and adjacent fat tissue which was detectable after the third day, and which was most notable on days 7 and 14. The application of PNE induced a pattern with a similar behavior, however on day 14, the inflammatory infiltrate of PNE was more evident compared with DN. Conclusion The proposed in vivo murine model has been useful for the study of the first phases of the regeneration process induced by both techniques. The histopathological results show that PNE generates a superior stimulus compared to DN on day 14.

Inflammatory response of two invasive techniques in the mouse with collagenase induced tendinopathy

Abstract Background Percutaneous needle electrolysis (PNE) is a physiotherapy technique which has demonstrated its effectiveness for the treatment of tendinopathies and muscle pathologies. All the authors consulted base its therapeutic effect on the capacity to produce an important inflammatory response during the initial phase of the regenerative process. However, presently, the histological effects of the technique on tendinopathies are unknown. The aim of this study was to histologically examine the inflammatory response provoked by the PNE versus dry needling (DN) in mice with collagenase-induced tendinopathy. Material and Methods In order to achieve the proposed aim, a murine model was used with a total of 18 C57BL/6J mice. One week prior to the intervention, collagenase-induced tendinopathy was performed in the common calcaneal tendons of all mice. Once the pathology was established, they received DN in the left common calcaneus tendon, whereas, on the right, they received treatment with PNE. Groups of animals were sacrificed at 3, 7 and 14 days to evaluate the histological evolution of injuries. Samples of the common calcaneal tendon were taken and were later fixed in formalin, processed, and included in paraffin blocks. Sections of 3 microns thick were performed, which were dyed using hematoxylin-eosin for conventional histopathological examination. Results In both groups, tissue damage was observed with collagen fragmentation and the presence of fibroblasts. Dry needling of the common calcaneal tendon induced the presence of an acute inflammatory infiltrate (characterized by the presence of polymorphonuclear neutrophils and macrophages) at the level of the peritenon and adjacent fat tissue which was detectable after day 3, and notable after days 7 and 14. The application of PNE induced a similar effect, although on day 14, the inflammatory infiltrate of PNE was more evident, compared to DN. Conclusion The proposed in vivo murine model has demonstrated to be useful for the study of the evolution of the first phases of the regenerative process induced by both techniques. The histopathological results reveal that PNE generates a pro-inflammatory stimulus which is superior to DN on day 14.

A comparative study between kessler suture versus polypropylene mesh implantation to repair tenotomized common calcaneal tendon in rabbits

A comparative study between kessler suture versus polypropylene mesh implantation to repair tenotomized common calcaneal tendon in rabbits

Percutaneous Repair of a Ruptured Common Calcaneal Tendon in a Dog

Percutaneous Repair of a Ruptured Common Calcaneal Tendon in a Dog

Common calcaneal tendon repair with glycerin-preserved carotid artery xenografts and autologous bone marrow mononuclear cells in rabbits

Utilizou-se 15 coelhos adultos para avaliar o reparo de lesão do tendão calcanear comum com implante de artéria carótida de cães, preservada em glicerina, associado ou não a células mononucleares autólogas da medula óssea (CMAs). Os animais foram observados diariamente por meio de avaliações clínicas e o local do implante foi analisado sob microscopia de luz decorridos 15, 30 e 60 dias de pós-operatório. Notou-se em todos os períodos de observação, com o implante associado às CMAs, melhor desempenho físico dos membros pélvico e maior intensidade de fibras colágenas, fibroblastos e linfócitos e neovascularização. A utilização de xenoimplante de artéria carótida de cães preservada em glicerina associado à administração de células mononucleares da medula óssea foi eficiente no reparo do tendão calcanear comum de coelhos.

Tenorrhaphy of the Common Calcaneal Tendon in Dogs and Cats

Background: Common calcaneal tendon (CCT) is usually affected by injuries in dogs and less frequently in cats. The Achilles mechanism consists of the convergence of three distinct structures: the tendons of the gastrocnemius muscle, superficial digital flexor muscle and the common tendons of the biceps femoris, gracilis, and semitendinosus muscles. Classification of lesions is based upon their location, severity and chronicity. Clinical signs include lameness, plantigrade stance and various degrees of tarsal hyperflexion according to the injury’s severity. The purpose of this study is to report four cases of reconstruction of the common calcaneus in three dogs and a cat.Cases: Case 1. A 10-year-old male canine, Brazilian Terrier, 7.7 kg of body weight, with a 6-month history of nonweightbearing lameness of the right hind limb attended consultation. Orthopedic examination showed plantigrade stance, hyperflexion of the right tibial-tarsal joint (TTJ) and swelling with fibrous thickening of the distal portion of the CCT. Surgical tendon repair was achieved through insertion of a locking screw on the calcaneo-tibial, tenorrhaphy and suture of a titanium plate on the caudal aspect of the CCT. Case 2. A 2-year-old female mongrel canine, with 13.3 kg of body weight was presented with the complaint of chronic left hind leg lameness. The owner described trauma at the area of the hock six months prior to consultation. On orthopedic exam, severe lameness was noted, swelling with fibrous thickening of the distal portion of the common calcaneal tendon and hyperflexion of the left TTJ (plantigrade position) were visible. Tendon repair was performed in the same manner as in case 1, except that in this case a bovine pericardium graft preserved in glycerin 98% was sutured over the tendon/plate conjunction. Case 3. A 6-year-old female mongrel canine, with 18.6 kg of body weight was attended with a 22-day history of right hind limb lameness. On physical exam intermittent lameness during gait performance and non-weight-bearing position in stance were noted. The distal portion of the limb was internally rotated with plantigrade stance and discontinuity of the CCT was palpable. Tenorrhaphy was performed similarly to case 2. Case 4. A 6 kg, 3-year-old, mixed breed male feline was admitted with a wound on the CCT region for 7 days. The wound was originated after animal interaction with a stray feline. On clinical examination the animal was non-weight bearing on the right hind limb, with plantigrade posture and with a 1 cm wound on the caudal portion of the CCT with tendon exposure. Surgical repair was performed by tenorrhaphy with placement of a surgical steel plate on the caudal aspect of the CCT. A bovine pericardium graft preserved in glycerin 98% was sutured on top of the plate. The TTJ was immobilized with a type II transarticular external fixator.Discussion: Ultrasonography is the test of choice to monitor tendon healing after tenorrhaphy. At this report, this exam was crucial to determine when the calcaneal-tibial screw could be removed. Two dogs and the cat from this report received an association of plate and bovine pericardium preserved in glycerin 98%. The purpose of this association was to increase the strength of the tenorrhaphy, and the pericardium graft had also the function of reducing the formation of peritendinous adhesions. Immobilization of the TTJ has the purpose of opposing muscle forces to avoid stress at tenorrhaphy suture increasing the strength of the healed tendon allowing early weight bear while minimizing the recurrence risk and avoiding limb contracture. We chose to perform the procedure with hyperextension of the TTJ in order to promote greater relaxation of the tendon since there was need to remove large portions of calcaneal fibrous tissues of the dogs and devitalized tissue in the cat from this report. Surgical treatment of injuries of the Achilles mechanism has good prognosis in complete closed lesions treated by tenorrhaphy associated with suture of a plate, suture of bovine pericardial graft preserved in 98% glycerin, calcaneal-tibial locking screw and splint for six weeks.Keywords: Achilles tendon, rupture, calcaneo-tibial screw, locking-loop suture pattern.