| 1. |
- Ekenman, I, et al.
(författare)
-
A study of intrinsic factors in patients with stress fractures of the tibia
- 1996
-
Ingår i: Foot & ankle international. - : SAGE Publications. - 1071-1007 .- 1944-7876. ; 17:8, s. 477-482
-
Tidskriftsartikel (refereegranskat)abstract
- We aimed to study intrinsic factors in 29 consecutive patients with well-documented unilateral stress fractures of the tibia. Anthropometry, range of motion, isokinetic plantar flexor muscle performance, and gait pattern were analyzed. The uninjured leg served as the control. A reference group of 30 uninjured subjects was compared regarding gait pattern. Anterior stress fractures of the tibia (N = 10) were localized in the push-off/ landing leg in 9/10 athletes, but were similarly distributed between legs in posteromedial injuries (N = 19). Ten (30%) of the stress fracture subjects had bilateral high foot arches, similar to those found in the reference group. There were no other systematic differences in anthropometry, range of motion, gait pattern, or isokinetic plantar flexor muscle peak torque and endurance between injured and uninjured legs. No other differences were found between anterior and posteromedial stress fractures. We conclude that anterior stress fractures of the tibia occur mainly in the push-off/landing leg in athletes. Within the limitations of our protocol, no registered intrinsic factor was found to be directly associated with the occurrence of a stress fracture of the tibia.
|
|
| 2. |
|
|
| 3. |
|
|
| 4. |
|
|
| 5. |
- Arndt, A, et al.
(författare)
-
An in vitro comparison of bone deformation measured with surface and staple mounted strain gauges
- 1999
-
Ingår i: JOURNAL OF BIOMECHANICS. - : ELSEVIER SCI LTD. - 0021-9290. ; 32:12, s. 1359-1363
-
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Chicken tibiae were chosen as a model for human second metatarsals. Local surface bone deformation in a 4-point bending configuration was measured in vitro by both strain gauge instrumented staples and strain gauges bonded to the bone's cortical surface.
|
|
| 6. |
|
|
| 7. |
- EKENMAN, I, et al.
(författare)
-
Bone density in medieval skeletons
- 1995
-
Ingår i: Calcified tissue international. - 0171-967X. ; 56:5, s. 355-358
-
Tidskriftsartikel (refereegranskat)
|
|
| 8. |
|
|
| 9. |
- Ekenman, I, et al.
(författare)
-
Local bone deformation at two predominant sites for stress fractures of the tibia: an in vivo study
- 1998
-
Ingår i: Foot & ankle international. - : SAGE Publications. - 1071-1007 .- 1944-7876. ; 19:7, s. 479-484
-
Tidskriftsartikel (refereegranskat)abstract
- Local bone deformation was registered at two predominant injury sites for tibial stress fractures in a healthy female volunteer. Two instrumented strain gauge staples were inserted under local anesthesia to the anterior middiaphysis (AM) and to the posteromedial part of the distal tibia (PD). Calibration and reliability of the instrumented staple system have previously been demonstrated in vitro. Concomitant ground reaction forces were registered with a Kistler force plate. Studying peak values, it was shown that during a voluntary 30-cm forward jump, PD deformation was greater during forefoot landing (2700–4200 microstrain) than during a heel strike landing (1200–1900 microstrain) and also compared with the concomitant AM deformation under both above testing conditions (1300–1900 microstrain). The stance phase during walking resulted in PD deformation of 950 microstrain, whereas the concomitant AM deformation was 334 microstrain. The greatest AM deformation (mean, 2128 microstrain) was registered during ground contact after a voluntary vertical drop from a height of 45 cm, concomitant with a PD deformation of 436 microstrain. These data are the first to show different local deformations at various sites of the tibia in vivo. The PD deformation was larger than previously noted from other parts of the tibia, whereas the middiaphysis data are consistent with other reports. The results may support the clinical assumption of different etiologies for stress fractures at these predominant sites.
|
|
| 10. |
|
|
| 11. |
|
|
| 12. |
|
|
| 13. |
- Ekenman, I, et al.
(författare)
-
The role of biomechanical shoe orthoses in tibial stress fracture prevention
- 2002
-
Ingår i: The American journal of sports medicine. - : SAGE Publications. - 0363-5465 .- 1552-3365. ; 30:6, s. 866-870
-
Tidskriftsartikel (refereegranskat)abstract
- Biomechanical orthoses have been shown to lower stress fracture incidence in infantry recruits. However, these results may not be applicable to running athletes.HypothesisTraining in either running shoes or military boots with custom biomechanical shoe orthoses lessens tibial bone strains and strain rates during walking and running.Study DesignRandomized controlled laboratory study.MethodsIn vivo strain measurements were made in nine subjects to determine whether the use of biomechanical orthoses lowers tibial strains during both walking and running and whether such lowering depends on the type of shoe worn. Measurements were made during treadmill walking at 5 km/hr and then during serial 2-km treadmill runs at 13 km/hr with running shoes, with and without the orthoses, and during serial 1-km runs with army boots, with and without the orthoses.ResultsWhen soft or semirigid biomechanical orthoses were worn with boots, the tibial peak-to-peak strains were significantly lowered. Soft orthoses also significantly lowered the tension and compression strain rates when worn with boots. During running, semirigid orthoses significantly increased the compression and tension strain rates when worn with boots.ConclusionsThe use of biomechanical orthoses may be warranted for tibial stress fracture prevention during training in which boots are worn and that mostly involves walking, but they are not warranted for activities that primarily involve running or are performed in running shoes.
|
|
| 14. |
|
|
| 15. |
|
|
| 16. |
|
|
| 17. |
|
|
| 18. |
- Milgrom, C, et al.
(författare)
-
Metatarsal strains are sufficient to cause fatigue fracture during cyclic overloading
- 2002
-
Ingår i: Foot & ankle international. - : SAGE Publications. - 1071-1007 .- 1944-7876. ; 23:3, s. 230-235
-
Tidskriftsartikel (refereegranskat)abstract
- Human in vivo tibial strains during vigorous walking have not been found to exceed 1200 microstrains. These values are below those found in ex vivo studies (>3000 microstrains) to cause cortical bone fatigue failure, suggesting that an intermediate bone remodeling response may be associated with tibial stress fractures. Metatarsal stress fractures, however, often develop before there is time for such a response to occur. Simultaneous in vivo axial strains were measured at the mid diaphysis of the second metatarsal and the tibia in two subjects. Peak axial metatarsal compression strains and strain rates were significantly higher than those of the tibia during treadmill walking and jogging both barefoot and with running shoes and during simple calisthenics. During barefoot treadmill walking metatarsal compression strains were greater than 2500 microstrains. During one- and two-leg vertical jumps and broad jumping, both metatarsal compression and tension strains were >3000 microstrains. Compression and tension strains in the metatarsus unlike those of the tibia may be sufficiently high even during moderate exertional activities to cause fatigue failure of bone secondary to the number of loading cycles without an intermediate bone remodeling response.
|
|
| 19. |
|
|
| 20. |
|
|
