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At least 505 records · Page 28Linked to original sources
PubMed2000

Knee strength deficits after hamstring tendon and patellar tendon anterior cruciate ligament reconstruction.

PURPOSE: The purpose of this study was to examine the strength of the knee flexors and knee extensors after two surgical techniques of ACL reconstruction and compare them to an age and activity level matched control group. METHODS: Twenty-four subjects who had undergone ACL reconstruction greater than 1 yr previously were placed into one of two groups according to autograft donor site: patellar tendon (BPB; N = 8) and hamstring (H; N = 16), and compared with an active, control group (N = 30). Knee flexor and extensor strength was evaluated using isovelocity dynamometry (5 speeds, eccentric and concentric, 5-95 degrees ROM). Strength maps were used to graphically analyze strength over a broad operational domain of the neuromuscular system. Average strength maps were determined for each autograft group and compared with controls. A difference map (control minus graft group) and confidence (t-test) maps were used to quantitatively identify strength deficits. RESULTS: The combined ACL group (N = 24) revealed a global 25.5% extensor strength deficit, with eccentric regional (angle and velocity matched) deficits up to 50% of control. Strength deficits covered over 86% of the sampled strength map area (P < 0.01). These knee extensor strength deficits are greater than previously reported. In addition, the BPB group demonstrated a concentric, low velocity, knee extensor strength deficit at 60-95 degrees that was not observed in the H group. Significant graft site dependent, regional knee flexor deficits of up to 50% of control were observed for the H group. CONCLUSIONS: Strength deficits localized to specific contraction types and ranges of motion were demonstrated between the ACL and control groups that were dependent upon autograft donor site. Postoperative rehabilitation protocols specific to these deficits should be devised.

Adult↗
PubMed1999

Harvest of patellar tendon (bone-tendon-bone) autograft for ACL reconstruction significantly alters surface strain in the human patella.

The purpose of this study was to measure the effect of bone-patellar tendon-bone autograft harvest for anterior cruciate ligament (ACL) reconstruction on the surface strain of the human patella. Through progressive removal of bone from the patella, three different defect shapes as well as the intact patella were tested in each of seven knees. Maximum principal strain and corresponding principal direction were determined from each of three gages around the defect for the four conditions (intact plus three defect shapes). There were no statistically significant differences in overall average surface strain between any of the defect shapes. Following graft harvest, overall average strain (all three defects combined) increased in the patella both medial (15 percent increase) and lateral (34 percent increase) to the defect, while decreasing in the region directly proximal (22 percent decrease) to the harvest site compared to the intact patella. A statistically significant 7.5 deg shift of principal direction from longitudinal toward a more transverse (lateral-superior to medial-inferior) direction was observed in the medial region when a shallow-dome defect was made. We conclude that removal of a bone block from the anterior, inferior part of the patella induces a significant redistribution of the surface strain. This results in greater local strain adjacent to the upper border of the bone block increasing the risk for patella fracture. This effect may be of importance in various complications known to occur after ACL reconstruction.

Aged↗
PubMedDate not supplied

Distal biceps brachii tendon repair. An in vitro biomechanical study of tendon reattachment.

Clinical reports suggest that suture anchors can simplify repair of distal biceps tendon avulsions. In this study, fixation strengths of Mitek and Statak suture anchors were compared with strength of reattachment using transosseous suture tunnels in eight cadaveric radii. Cyclic loading and load-to-failure testing were performed: No specimen failed during testing to 50 N for 3600 cycles: however, four of the Mitek anchors and one of the Statak anchors protruded out of the medullary canal. The mean load to failure of the Mitek suture anchor complexes was 220 +/- 54 N, that of the Statak suture anchor complexes was 187 +/- 64 N, and that of the transosseous sutures was 307 +/- 142 N. There was no significant difference in the failure load or mechanism of failure between the Statak and Mitek anchors. Transosseous sutures failed at significantly greater loads on static testing than the suture anchors. Cyclic loading results suggest that the bony fixation achieved using these three techniques should be sufficient to allow immediate passive mobilization of the elbow after surgery. Protrusion of the suture anchors out of the tuberosity during cyclic loading is a concern because of potential development of a gap at the repair site and interference with forearm rotation.

Arm Injuries↗
PubMed2004

A comparison of autogenous patellar tendon and hamstring tendon grafts for anterior cruciate ligament reconstruction.

Several graft options exist for reconstruction of the deficient ACL. The most commonly used grafts are the BPTB and quadrupled hamstring tendon autografts. Based on a comprehensive review of the literature, one graft is not superior to the other. Advantages and disadvantages are associated with the use of each graft. Surgeons who perform ACL reconstruction should be familiar with the use of both grafts.

Anterior Cruciate Ligament↗
PubMed1990

Peroneus longus tendon and peroneus brevis tendon dislocation. A case report.

Trauma that produces recurrent dislocation of the peroneal tendons often is mistaken for an ankle sprain, or occurs in conjunction with an inversion ankle sprain. Self-diagnosis and self-treatment may preclude accurate diagnosis and management. The authors present a case that illustrates this scenario and review anatomical considerations, the mechanism of the injury, and therapeutic options.

Adult↗
PubMed1991

Achilles tendon repair: a new method of Achilles tendon repair tested on cadaverous materials.

Conventional suture techniques were compared with a new and modified continuous six-strand suture technique (CSSS) in laboratory tests on cadaverous Achilles tendons. The techniques were compared with regard to gapping resistance and rupture point. The CSSS technique had significantly greater tensile strength and gapping resistance than the Mason and Bunnell techniques.

Achilles Tendon↗
PubMed1995

Tibialis posterior tendon dysfunction and peroneal tendon subluxation.

The authors overview tibialis posterior dysfunction (TPD) with emphasis on a criteria-oriented surgical protocol for management of the various clinical and pathologic stages of TPD. Subluxation of the peroneal tendons is also detailed with respect to diagnosis and treatment.

Foot Diseases↗
PubMed1977

Chronic tenosynovitis of the extensor tendons and tendon sheaths of the carpal region in the horse.

Seven cases of chronic tenosynovitis affecting the extensor carpi radialis or lateral digital extensor tendon and their sheaths are described. All cases were chronic and in 4 of the cases previous treatment by drainage and local corticosteroid injection had been ineffective. Surgical exploration of 6 cases demonstrated a distinct lesion and specific surgical treatment was carried out.

Animals↗