Archives of orthopaedic and trauma surgery
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Arch Orthop Trauma Surg · Jan 2000
Natural history of unreduced congenital dislocation of the hip in adults.
The natural history of 33 patients with 43 unreduced congenital dislocations of the hip was reviewed. The average age at the first consultation was 50 years. Four were men and 29 were women. ⋯ The average dislocation index was increased in the standing more than in the lying position. In unilaterally dislocated hips the average femorotibial angles in the ipsilateral and contralateral knees to the dislocated hip were 172 and 179 deg, respectively. Lumbar degenerative scoliosis of more than 5 deg was observed in 16 patients.
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Arch Orthop Trauma Surg · Jan 2000
Rotational profile of the lower extremity and foot progression angle: computerized tomographic examination of 50 male adults.
Acetabular, femoral and tibial torsion of 50 normal adult male subjects were measured by computerized tomography and the relationship between these angles and foot-progression angle was examined. The mean acetabular anteversion was 15.6 degrees on the right and 15.8 degrees on the left, (range 3 degrees-30 degrees). The mean femoral torsion was 6.5 degrees on the right and 5.8 degrees on the left (range 14 degrees-28 degrees). ⋯ Although the normal range of torsional measurements of the lower extremity was very broad, subjects usually had out-toeing, with a mean foot-progression angle of 13.7 degrees on the right and 13.0 degrees on the left (range 6 degrees-21 degrees). No correlation was detected on the rotation between different levels of the lower limb. No difference was detected in the lower extremity rotational profile between right and left sides.
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Arch Orthop Trauma Surg · Jan 2000
Mechanical properties of a rat patellar tendon stress-shielded in situ.
The effects of stress deprivation on the mechanical properties of the patellar tendon (PT) were studied using 14 albino rats. The PT was stress-shielded with cerclages on one side, while the contralateral patellar tendon served as a sham-operated control. After 10 weeks, paired load-strain as well as load-relaxation experiments were performed (11 and 3 specimen pairs, respectively). ⋯ The time constant significantly decreased in the stress-shielded specimens under 5 N loads, which may be considered 'physiological'. Tissue remodeling might explain the observed changes in the viscoelastic behaviour of the stress-shielded tendons. Loading, even in the physiological range of normal daily activity, may lead to an elongation of previously stress-shielded tendons or ligaments and consequently alter the behaviour of a joint.
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Arch Orthop Trauma Surg · Jan 2000
Increased interleukin-8 (IL-8) expression is related to aseptic loosening of total hip replacement.
Aseptic loosening is an increasing problem in total hip replacement (THR). Chronic inflammatory reaction against implant wear particle results in collageno- and osteolysis, leading to loosening of the implant. Cytokines are known to play a major role in this particular inflammatory process. ⋯ The present study determines for the first time the cellular origin of IL-8 in aseptically loosened THRs and also quantitates the IL-8-producing cells in the periprosthetic tissue. The results reveal a high rise in IL-8 concentration in SLIM and in synovial tissues. This finding moves us one step forward in solving the complex network of multiple factors affecting loosening of hip implants.