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The use of eccentric training and stretching in the treatment and prevention of tendon injuries.

Tendon injuries are a common consequence of either sports or daily routine activity. Most people will suffer at least one tendon injury in his or her lifetime. It is therefore prudent to understand the different ways to load tendon and the ways in which the muscle-tendon-bone unit responds to these stresses. By maximizing tendon training and rehabilitation, one can maximize the stresses (eccentric) a tendon will withstand. This article provides an explanation of these principles.

Achilles Tendon

Patellar tendon injuries.

Patellar tendon injury secondary to overuse represents a failure of soft tissue healing that can lead to chronic symptoms. Clinical staging of this process is helpful in the initial management. Diagnostic imaging can help define the character of the injury as well as localized pathology. Initial treatment of clinical stages I, II, and III is conservative.

Athletic Injuries

Early dynamic splinting for extensor tendon injuries.

Extensor tendon injuries are traditionally splinted with no motion for 3 to 4 weeks after repair. This may result in limitation of flexion because of extensor tenodesis at the site of repair. To prevent this, we used a dynamic splinting program opposite to the one that is used for flexor tendon repair, with an outrigger splint holding the fingers in extension and allowing full active flexion. Fifty-two patients who had extensor tendon repairs in the area from the wrist to the middle of the proximal phalanx were treated. Motion was begun 2 to 5 days after repair and was continued for approximately 5 weeks. No tendon ruptures occurred, and all patients recovered full flexion.

Adult

Treatment of tendon injuries in children.

Tendon injuries in the child's hand can be repaired primarily with better results than in the adult; this is true at all levels, including the digital sheath. In less than ideal circumstances, secondary conventional tendon grafting also provides predictable satisfactory results and can also salvage a failed primary repair. In children under the age of six years with digital flexor tendon repairs, the limb must be immobilized above the elbow. In the cooperative child over the age of six years with a primary repair of a lacerated flexor tendon, the dorsal splint with rubber band traction as described by Kleinert is recommended. Preoperative diagnosis of tendon injuries in the young child is difficult. If there is any doubt after observing the child using his hand, the wound must be explored and tendons and nerves identified to ensure their integrity. Even though the results of tendon repair in children are better than in adults, the structures are small, technique must be meticulous, and magnification must be used. Specially trained hand surgeons experienced in primary tendon repair and tendon grafting should perform these procedures, for this elegant structure deserves the finest attention.

Adolescent

Flexor tendon injuries. Part 2. Flexor tendon repair.

The principles of atraumatic flexor tendon repair are reviewed. It is noted that tendon repair of the profundus and superficialis tendons-primary or delayed primary-should be carried out in all zones of flexor tendon interruption. Whenever possible, repair of the flexor tendon sheath also seems appropriate. A supervised program of early motion may prove beneficial, though restoration of function to a digit may be long and tedious, thus requiring a high degree of patient motivation and participation.

Finger Joint

Flexor tendon injuries. Part 3. Free tendon grafts.

Tendon grafting, to restore digital flexion, is the treatment of choice in those cases in which the flexor tendons, divided in Zone 1 or Zone 2 cannot be directly repaired. The indications and techniques for conventional free tendon grafting are presented and discussed. Particular surgical procedures for use in cases with interruption of profundus and superficialis and in cases with an intact flexor digitorum superficialis are described.

Humans

Hand tendon injuries in athletics.

Hand tendon injuries may be caused by acute trauma or chronic overuse. Although these injuries are common in athletics, specific diagnoses can be difficult to make and are often delayed. Early diagnosis is the key to a good outcome. Most hand tendon injuries do well with nonoperative treatment when initiated early. Long-term disruption of the delicate balance of muscle forces in the hand will lead to secondary changes that are often difficult to correct. Delay in treatment of overuse injuries may produce chronic inflammation that does not respond to conservative care and requires operative management. A sound knowledge of hand anatomy, awareness of the differential diagnosis, and a high index of suspicion are needed for proper care of the athletic hand injury.

Acute Disease

Flexor tendon injuries. Part 4. Staged flexor tendon reconstruction and restoration of the flexor pulley.

Staged reconstruction of the flexor tendon is discussed and several surgical techniques involving implantation of a silicone or silicone-Dacron-reinforced gliding prosthesis into a scarred flexor tendon bed are described. Flexor pulley restoration and the importance of maintaining strong pulley support are discussed and surgical techniques including those for flexor tendon grafting and reconstruction are described. Though the results of these procedures leave much to be desired, the proper technique utilized under the right circumstances can restore satisfactory function following interruption or destruction of flexor tendons.

Finger Joint

Tendon injuries about the ankle in athletes.

Tendinous injuries about the foot and ankle are often the result of overloading and repetitive microtrauma stemming from training errors, poor technique, and the use of inappropriate surfaces or equipment. Other factors that must be considered include anatomic malalignment and muscle imbalance. Injuries involving tendons include inflammation, subluxation, and rupture. A correct and timely diagnosis should assist athletes, trainers, coaches, and physicians in preventing and treating these disorders.

Achilles Tendon

Cell-matrix response in tendon injury.

The healing response after tendon injury is defined by cell matrix adaptive capability. There are distinct macrotraumatic and microtraumatic injury patterns and a spectrum of pathologic responses from inflammation to tissue degeneration, as characterized by the tendinosis phenomenon. Epigenetic and genetic factors govern recovery from tendon injury. The potential for future modulation of injury repair by protein mediators or growth factors appears promising.

Achilles Tendon

[Tendon injuries in sports].

Epidemiologic data on the incidence of tendon injuries in these actively engaged in sports are missing. The significance of the tendon injury lies in the prognosis for any further sporting activities, the risk of chronicity, and thus the impairment of functional capacity (fitness). Pathogenesis, clinical features and treatment of the most essential tendon injuries are presented, based upon a literature search. The choice between conservative and operative treatment of tendon injuries is great of practical significance.

Achilles Tendon

[Scanning electron microscopy studies following two-stage tendon and tendon sheath reconstruction in experimental flexor tendon injuries].

This study involves the initial injury of a flexor tendon in chickens toes, followed by a two-step reconstruction of the tendon and its sheath. At first the damaged scarred tendon sheath region was replaced by a transplanted vein or fascia. Tendon restoration was done in the second step with a free tendon transplantation. The restored tendon sheath was then studied in sections under EM. It was observed that the surface of the reconstructed sheath was very similar to that of an intact sheath; the inner surface of the fascia being smoother than the vein. Likewise, the surface and inner structure of the transplanted tendon was proved to resemble an intact tendon. On the basis of the results of this investigation, it is believed that this procedure may be successfully applied to the reconstruction of human flexor tendon injuries in the future.

Animals

cis-hydroxyproline limits work necessary to flex a digit after tendon injury.

Present surgical procedures for the repair of tendon injury are complicated by formation of peritendinous collagenous adhesions which restrict tendon gliding. Several sensitive biomechanical tests have been developed to quantitate peritendinous restriction of gliding. Using these tests it was found that cis-hydroxyproline significantly limits net collagen accumulation following tendon injury in a rat model and decreases the adhesive restraints to tendon gliding. cis-Hydroxyproline and other proline analoques offer a method for specifically preventing excessive collagen formation.

Animals

Achilles tendon injuries in athletes.

During 1976-1986, 3,336 athletes consulted the Turku Sports Medical Research Unit, 455 (14%) of these for Achilles tendon injuries. Achilles tendon problems were more frequent among joggers (66%), tennis players (32%) and runners (24%), which emphasizes the aetiological role of running. Achilles tendon complaints (n = 698) consisted of paratenonitis (including tendinopathies) (66%), insertional (23%) and myotendineal (8%) pain syndromes and total tendon ruptures (3%). The mean age of Achilles tendon injury patients was 26.1 years; among other sport injury patients it was 21.9 years (P less than 0.001). Surgery was performed in 24% of the subjects with paratenonitis and insertional pains. Different structural faults were found in 60% of the athletes with Achilles tendon overuse injuries. Forefoot varus correlated (r = P less than 0.001) with paratenonitis. A markedly limited total passive subtalar joint mobility and/or ankle joint dorsiflexion with knee extended was found in 6% of the conscripts, in 44% of the control athletes and in 58% and 70% of athletes with Achilles tendon paratenonitis and insertional pains, respectively. The range of motion of the ankle and subtalar joints was much lower in athletes than conscripts (P less than 0.001).

Achilles Tendon

Primary care of flexor tendon injuries.

The approach to the acute flexor tendon injury is an area of hand surgery that has seen considerable change in the last 25 years. Direct repair in the early postinjury period, at all levels of injury, is the accepted procedure provided wound conditions permit. The procedures performed along with the tendon repair in zone 2 are based on both clinical experience as well as laboratory evidence, but additions such as sheath closure have not been completely proven to improve the clinical result. At this time, both flexor tendons are repaired in zone 2 and the flexor sheath is repaired. All patients are mobilized in a protected mobilization program. The last modification is probably the chief reason that results from flexor repairs are improving at this time.

Hand

[Assessment of treatment results of extensor tendon injuries].

Criteria for evaluation of results after extensor tendon lesions are presented, which are easy to apply and based on angular measurements of active joint mobility. The scheme is analogous to the evaluation method for flexor tendon injuries published by Buck-Gramcko et al. in 1976 which is now widely used. A modification was necessary to treat the extension deficits more severely. A comparison is made to the evaluation method proposed by the Group of Erlangen, and both schemes are tested on 68 patients with extensor tendon injuries of different zones, various fingers and combinations. Lesions of the thumb require different criteria.

Adolescent