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Biomedical subjects

C Milgrom

Publications and source records attributed to C Milgrom.

At least 73 records · Page 4Linked to original sources
PubMed1986

Recurrent stress fractures in military recruits. One-year follow-up of 66 recruits.

Of 66 recruits who sustained stress fractures during basic training and returned to training after a period of rest, seven (10.6%) suffered recurrent fractures within one year. None of the recurrences was at the original anatomical site. All of the recruits with recurrent stress fractures had had at least one of their initial stress fractures in the femur. This suggests that a femoral stress fracture carries a high risk of recurrence at other sites.

Adult↗
PubMed1986

MRI and CT scan compared with microscopic histopathology in osteogenic sarcoma of the proximal tibia.

The authors report the case of a 15-year-old female who presented with a history of vague but constant pain about the medial aspect of her right knee. X-ray established the presence of an expanding lesion in the medial tibial plateau. Computerized axial tomography (CT) and magnetic resonance imaging (MRI) were used in the evaluation of the lesion. The authors compare the preoperative CT and MRI findings with the microscopic histopathology of the amputation specimen and note that the CT scan underestimated the extent of the microscopic tumor boundaries, whereas MRI showed altered activity beyond these boundaries.

Adolescent↗
PubMed1986

Effect of intense physical activity on the bone-mineral content in the lower limbs of young adults.

The effect of intense physical training on the bone-mineral content of young adults who are unaccustomed to physical activity has not yet been established. In this study, 268 male recruits, eighteen to twenty-one years old, were evaluated before and after fourteen weeks of strenuous physical training. The bone-mineral content of both legs at the level of the distal third of the tibia in each individual was measured using single-beam photon absorptiometry. The subjects started their training with equal values for bone-mineral content in both legs. During the training period, the average bone-mineral content of the left leg increased by 11.1 per cent and that of the right leg, by 5.2 per cent. In the group of subjects who did not complete the training course, mainly because they incurred stress fractures, the increase in bone-mineral content was significantly less than the increase in those who completed the program. This study indicated that in young adults a high level of loading of bone results in either a stress fracture or a rapid increase in bone-mineral content.

Adolescent↗
PubMed1986

Medial tibial pain. A prospective study of its cause among military recruits.

In a prospective study of 295 infantry recruits during 14 weeks of basic training, 41% had medial tibial pain. Routine scintigraphic evaluation in cases of medial tibial bone pain showed that 63% had abnormalities. A stress fracture was found in 46%. Only two patients had periostitis. None had ischemic medial compartment syndrome. Physical examination could not differentiate between cases with medial tibial bone pain secondary to stress fractures and those with scintigraphically normal tibias. When both pain and swelling were localized in the middle one-third of the tibia, the lesion most likely proved to be a stress fracture.

Fractures, Bone↗
PubMed1985

A prospective study of the effect of a shock-absorbing orthotic device on the incidence of stress fractures in military recruits.

In a prospective study of stress fractures the hypothesis that a shock-absorbing orthotic device worn within military boots could lessen the incidence of stress fractures was tested. The incidence of metatarsal, tibial, and femoral stress fractures was lower in the orthotic group, but only the latter difference was statistically significant. The time of onset and the location of stress fractures between orthotic and nonorthotic users did not differ. These findings suggest that the incidence of femoral stress fractures, which are the most dangerous type of stress fracture because of their high risk of developing into displaced fractures, can be reduced by an orthotic device.

Fractures, Bone↗
PubMed1985

The normal range of subtalar inversion and eversion in young males as measured by three different techniques.

In a prospective study, 272 males aged 18 to 20 had goniometric measurement of their subtalar inversion and eversion by three different methods. Placing the ankle in dorsiflexion while performing the measurements decreased the mean inversion from 32 to 22 degrees but had little effect on eversion. The neutral position of the subtalar joint was found to have a mean value of 3 degrees of varus from the midpoint of the tibia. The technique for measuring subtalar motion as described by the Committee for the Study of Joint Motion of the American Academy of Orthopaedic Surgeons has less subjective variables than the other two methods used in this study. Its use is therefore recommended if comparisons are to be made between series.

Adolescent↗
PubMed1985

Stress fractures in military recruits. A prospective study showing an unusually high incidence.

In a prospective study of 295 male Israeli military recruits a 31% incidence of stress fractures was found. Eighty per cent of the fractures were in the tibial or femoral shaft, while only 8% occurred in the tarsus and metatarsus. Sixty-nine per cent of the femoral stress fractures were asymptomatic, but only 8% of those in the tibia. Even asymptomatic stress fractures do, however, need to be treated. Possible explanations for the unusually high incidence of stress fractures in this study are discussed.

Adolescent↗
PubMed1985

Spongious and cortical osteoblastoma of the axial skeleton.

Eleven cases of osteoblastoma (spongious osteoblastoma) and four cases of osteoid osteoma (cortical osteoblastoma) involving the spine, diagnosed at Hadassah Hospital between 1970 and 1983 were analyzed. The age range was 7 to 34 years and the average clinical follow up was 63 months. The cervical spine was involved in four patients, thoracic in four, lumbar in six and the sacrum in one patient. Back or neck pain associated with stiffness was present in all cases and was often accompanied by scoliosis or torticollis. All the patients with osteoid osteoma were symptom relieved by surgery without recurrence. Seven of the patients with benign osteoblastoma presented with neurological signs or symptoms and three of these had recurrence following primary surgery. Although cortical and spongious osteoblastoma are considered as members of the same family of benign tumors of osteoblastic derivation, spongious osteoblastoma does not seem to be limited in growth potential as is cortical osteoblastoma.

Adolescent↗
PubMed1984

The history of treatment of congenital clubfoot at the Royal Liverpool Children's Hospital: improvement of results by early extensive posteromedial release.

The results of treatment in 77 clubfeet were assessed after an average follow-up of 8 years. In those patients with surgical treatment it was found that the Turco posteromedial release within the first 3 months of life resulted in 13 of 16 satisfactory feet. In comparison, only five of 21 feet had satisfactory results when the average age of operation was delayed to 3.7 years and a less extensive release performed. At follow-up, abnormal radiological findings were not found in the early operated cases. The average talocalcaneal index was 47 degrees. The late operated feet showed major abnormal X-ray film findings, and their average index was 38 degrees. Good functional results, however, often coexisted with abnormal radiological findings in the midfoot. Abnormal findings of the hindfoot were always associated with unsatisfactory results. We conclude that the use of early (3 months) Turco posteromedial release can offer excellent results in treating severe resistant clubfeet.

Adolescent↗
PubMedDate not supplied

Ossicles anterior to the proximal tibia.

Ossicles anterior to the anterior tibia are most usually seen in relation to the tibial tuberosity. While these are usually taken to represent sequelae of previous Osgood-Schlatter disease, they may, on occasion, represent normal variants in ossification of the tuberosity. Ossicles superior to the tuberosity may have similar origins. Representative examples are presented, as is a very large ossicle separated from the anterior tibia by a prolongation of the knee joint space. Theories of causation of such ossicles are discussed.

Accidents, Occupational↗
PubMedDate not supplied

A prevalence study of recurrent shoulder dislocations in young adults.

The computerized database of the Israeli Defence Forces Medical Corps monitors recurrent shoulder dislocations before citizens are eligible for military induction, during the years of regular military service, and during the time of eligibility for reserve army service. With the computerized database of the Israeli Defence Forces Medical Corps, between the years of 1978 to 1995 the prevalence rate of subjects with recurrent shoulder dislocations less than or equal to 21 years of age was found to be 19.7 of 10,000 for men and 5.01 of 10,000 for women. The prevalence rate of subjects with a history of shoulder dislocations in the male population between the ages of 22 and 33 years was 42.4 of 10,000. Forty-four percent were judged to be sufficiently unstable to warrant surgery, but only 55% of these actually underwent surgery. These epidemiologic data may be important if arthroscopic shoulder surgery is being considered after a first shoulder dislocation.

Adult↗
PubMedDate not supplied

Effect of cane use on tibial strain and strain rates.

The effect of cane ambulation on hip biomechanics has been well studied, but its effect on tibial strains and strain rates is not known. To test the hypothesis that cane use may lower tibial strain and strain rates during walking, percutaneous axial extensometers were mounted on the right medial cortex of the midtibial diaphysis in seven male volunteers. In vivo peak-to-peak axial tibial strains and strain rates were measured for ipsilateral and contralateral cane usage and compared with a no cane control. Cane-assisted ambulation was not found to significantly lower strain magnitudes; however, tibial strain rates were significantly lowered by both ipsilateral and contralateral cane usage. We conclude that either ipsilateral or contralateral cane usage may be beneficial when lowering tibial strain rate is desired, such as in the treatment of tibia stress fracture or osteoarthrosis of the knee.

Adult↗
PubMedDate not supplied

Effect of fatiguing exercise on longitudinal bone strain as related to stress fracture in humans.

Muscular fatigue in the training athlete or military recruit has been hypothesized to cause increased bone strain that may contribute to the development of a stress fracture. Under normal circumstances, muscles exert a protective effect by contracting to reduce bending strains on cortical bone surfaces. In vivo strain studies in dogs show that muscle fatigue following strenuous exercise elevates bone strain and changes strain distribution. However, a similar experiment has yet to be performed in humans. The purpose of this work was to test the hypothesis in humans that strenuous fatiguing exercise causes an elevation in bone strain. It was also hypothesized that this elevation is greater in younger people than in older people due to the decline in muscle strength and endurance that normally occurs with age. To test these hypotheses, strain in the tibiae of seven human volunteers was measured during walking before and after a period of fatiguing exercise. Neither hypothesis was sustained. Post-hoc analysis of the strain data suggests that strain rate increases after fatigue with a greater increase in younger as opposed to older persons. Although not conclusive, this suggests that it is strain rate, rather than strain magnitude, that may be causal for stress fracture.

Adult↗
PubMedDate not supplied

Using bone's adaptation ability to lower the incidence of stress fractures.

In three prospective epidemiologic studies of the effect of pre-military-induction sport activities on the incidence of lower extremity stress fractures during infantry basic training, recruits who played ball sports (principally basketball) regularly for at least 2 years before basic training had a significantly lower incidence of stress fractures (13.2%, 16.7%, and 3.6% in the three studies, respectively) than recruits who did not play ball sports (28.9%, 27%, and 18.8%, respectively). Preinduction running was not related to the incidence of stress fracture. To assess the tibial strain environment during these sport activities, we made in vivo strain measurements on three male volunteers from the research team. Peak tibial compression and tension strain and strain rates during basketball reached levels 2 to 5.5 times higher than during walking and about 10% to 50% higher than during running. The high bone strain and strain rates that occurred in recruits while playing basketball in the years before military induction may have increased their bone stiffness, according to Wolff's Law. The stiffer bone could tolerate higher stresses better, resulting in lower strains for a given activity and a lower incidence of stress fractures during basic training.

Adaptation, Physiological↗