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Retainer for tendons used in the reconstruction of the anterior cruciate ligament of the knee
No full textRicostruzione del Legamento Crociato Anteriore coi Tendini del Semitendinoso e Gracile Raddoppiati: Tecnica Originale di Tensionamento, Fissazione ed Avvolgimento dei fasci “Swing-Bridge” (Ponte Girevole)
No full textSYNTHETIC BIOCOMPATIBLE MATERIAL HAVING AN IMPROVED OXIDATION RESISTANCE, PROCESS FOR PREPARING THE SAME AND PROSTHETIC ARTICLES OBTAINED THEREFROM
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Viscoelastic properties of the semitendinosus and gracilis tendons in reconstruction of the ACL: an in vivo evaluation.
No full textTensioning of the tendons of the semitendinosus and the gracilis used to reconstruct the anterior cruciate ligament (ACL) of the knee is one of the main factors to take into consideration during surgery that aims at obtaining good postoperative joint stability. Some authors have shown in vitro that the viscoelastic nature of the patellar tendon is responsible for its gradual release (loss of tension). It is the purpose of this study to verify in vivo the biomechanical behavior of the semitendinosus and gracilis tendons. A total of 40 consecutive patients were submitted to reconstruction of the ACL with flexor tendons of the knee using a method that allows for the gradual tensioning of the doubled semitendinosus and gracilis tendons using the Swing Bridge method. Patients were divided into 2 groups: in the first 20 patients (group I), after adequate manual pretensioning and tibial and femoral stabilization, the tendons were twisted using a dynamometer to measure torsion forces until tensioning equal to 2.5 N was achieved. The control group (group II) was made up of the successive 20 patients in whom tensioning of the tendons at 2.5 N was carried out in many phases. Five minutes after initial tensioning at 2.5 N the decrease in tension was recorded that returned to initial values. A similar procedure was carried out after 5 more minutes. The patients in both groups were evaluated using a KT-1000 arthrometer one year after surgery. The patients in group II showed a decrease in torsion equal to 37.2% after the first 5 minutes, and a further 26.8% after 5 more minutes, and measurement by means of KT-1000 revealed mean values for S/S 30 lb. and S/S MM of 1.3 mm and 1.7 mm, respectively, that proved to have a statistically significant difference (p < 0.05) as compared to the patients in group I (S/S 30 lb.: 2.0 mm; S/S MM: 2.4 mm). Although these data do not provide indications on the amount and duration of pretensioning and definitive tensioning to be applied to the transplant, they do clearly show the viscoelastic properties of the tendons. These properties require a more in-depth study to better determine the exact tensioning of the neoligament
Patellar tendinosis: A follow-up study of surgical treatment
No full textBackground: Patellar tendinopathy (jumper's knee) is an overuse syndrome that frequently affects athletes. A retrospective study was done to analyze the results at a minimum of five years after the performance of a surgical technique in competitive athletes. Methods: From 1985 to 1995, thirty-two patients (thirty-eight knees) affected by patellar tendinopathy were treated surgically after failure of nonoperative treatment. All knees were operated on by the same surgeon using the same surgical technique: longitudinal splitting of the tendon, excision of any abnormal tissue that was identified, and resection and drilling of the inferior pole of the patella. The results in twenty-seven patients (thirty-three knees), including twenty-two athletes (twenty-seven knees) who were still involved in sports activities (or wished to still be involved) at a competitive level at the time of final follow-up, were reviewed at a mean of eight years postoperatively. The results were evaluated according to symptoms and the ability to return to full sports activities. Results: The result was excellent in twenty-three knees (70%), good in five, fair in one, and poor in four at the time of the long-term follow-up. Eighty-two percent of the patients who tried to pursue sports at their preinjury level were able to do so, and 63% of those knees were totally symptom-free. Conclusions: The outcome of the described surgical treatment appears to be satisfactory; however, the results are less predictable in volleyball players
Histological assessment of regeneration of the semitendinosus tendon following its use for ACL reconstruction
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