|Year : 2013 | Volume
| Issue : 3 | Page : 313-317
Atraumatic femoral neck fracture secondary to prolonged lactation induced osteomalacia
Dhammapal Sahebrao Bhamare, Praful Herode, Abhijeet Shroff, Bharati Deokar, Samar K Biswas
Department of Orthopedics, Padmashree, Dr D Y Patil Medical College, Hospital and Research Centre, Dr D Y Patil Vidyapeeth, Pune, India
|Date of Web Publication||5-Jul-2013|
Dhammapal Sahebrao Bhamare
Department of Orthopaedics, Dr. D. Y. Patil Medical College, Mahesh Nagar, Pimpri, Pune, Maharashtra - 411 018
Source of Support: None, Conflict of Interest: None
Presenting a case of atraumatic fracture neck femur secondary to 2 years of prolonged lactation. A 26-year-old lactating mother presented with pain in left hip from last 12 months. She was apparently alright before and during pregnancy. Plain radiograph showed a complete undisplaced fracture of femoral neck. Osteomalacia was diagnosed by radiological and serological investigations. The fracture was fixed using AO type cannulated cancellous screws. The fracture showed good clinical and radiological union at 3 months. Literature review shows that this is a first case of atraumatic fracture of neck femur due to prolonged lactational osteomalacia. It showed that even apparently healthy Indians are susceptible to osteomalacia, more so during pregnancy and lactation and can be presented as atraumatic fracture. Although considered relatively stable, a compression type incomplete fracture neck femur may progress to a complete fracture if not treated in time.
Keywords: Atraumatic fracture, neck femur, osteomalacia, prolonged lactation
|How to cite this article:|
Bhamare DS, Herode P, Shroff A, Deokar B, Biswas SK. Atraumatic femoral neck fracture secondary to prolonged lactation induced osteomalacia. Med J DY Patil Univ 2013;6:313-7
|How to cite this URL:|
Bhamare DS, Herode P, Shroff A, Deokar B, Biswas SK. Atraumatic femoral neck fracture secondary to prolonged lactation induced osteomalacia. Med J DY Patil Univ [serial online] 2013 [cited 2020 Jan 29];6:313-7. Available from: http://www.mjdrdypu.org/text.asp?2013/6/3/313/114670
| Introduction|| |
The first case reported on bilateral loser's zones in neck femur of an Asian pregnant lady, which was treated conservatively with oral vitamin D and calcium with resultant good healing was published in 1985.  In 2003 a case of unilateral atraumatic displaced fracture of femur neck due to pregnancy induced osteomalacia was reported which was claimed to be first report of its kind.  Probably the first case of atraumatic bilaterally displaced fracture of neck femur due to osteomalacia during pregnancy of an Asian woman was documented in 2011, which went on to heal completely in spite of delay in treatment with internal fixation, calcium, and vitamin-D supplements.  However, it appears that osteomalacia leading to atraumatic fracture of the neck of femur due to prolonged lactation has not been reported in the literature and this case report appears to be the first of such kind.
| Case Report|| |
A 26-year-lactating female of Indian origin presented with history of insidious onset of left hip pain from 1 year. She had no history of trauma or sudden increase in physical activity. She was not on any medication nor had any significant medical history. She delivered a full term normal male child 2 years back. She was breast feeding on demand, till the time of presentation. She was not on any calcium or vitamin D supplementation during pregnancy and lactation.
Pain was localized, dull aching, increased gradually, and aggravated on exertion. On clinical examination, she had an antalgic gait, with deep tenderness in the anterior aspect of hip and trans-trochanteric thump test positive. Plain radiograph [Figure 1] revealed incomplete compression type fracture. She was advised hospitalization and serological investigations, for which she refused. She was given injectable Vitamin-D3 600000 IU, oral calcium 1000 mg twice daily, and was advised complete bed rest. She again presented after 2 months with aggravated pain, inability to bear weight, and perform activities of daily living. She agreed to hospitalization this time, after which further radiological and serological tests were performed. This time the radiograph showed an undisplaced but complete fracture of neck femur.
Her serological investigation showed serum 25-OH Vitamin D total levels of 10.81 (2 months after 600000 IU intramuscularly, with reference range of 6-20 ng/ml as insufficiency) and also had high levels of alkaline and acid phosphatase and a lower parathyroid hormone [Table 1]. Her DEXA scan for bone mineral density study was done which showed a T-score of −2.5 suggesting osteopenia. A plain CT Scan [Figure 2] and a 3-D CT reconstruction [Figure 3] were ordered to study the fracture morphology in further details. CT scan showed discontinuity of the cortical margin of the neck of left femur, extending medially as well as laterally with mild adjacent sclerosis. A plain MRI of hip joints [Figure 4] was also ordered, to rule out avascular necrosis of the femoral head as she had symptoms for more than a year long and also to get further information about the fracture morphology, this showed linear altered signal intensity area involving neck of left femur with altered signal intensity which is hyperintense on STIR and hypointense on T1W1- suggestive of fracture with marrow oedema.
After appropriate pre-anesthesia workup, she was treated with internal fixation of fracture with two AO type screws [Figure 5]. She was also treated with injectable Vitamin-D3, 600000 IU intramuscularly, and supplemented with oral vitamin-D3, 60000 IU every week and oral calcium 1 g twice a day. Adequate sunlight exposure was advised (30 min/day). She was also educated about her medical condition and prolonged lactation. She stopped breast feeding the child. She was also given oral medications to suppress her lactation. She was advised about proper dietary habits and nutrition. She was encouraged to consume milk and milk products along with a high protein diet. She was mobilized non-weight bearing immediately after surgery for one and half months following which she gradually increased weight bearing till full weight at 3 months. She was followed up for 12 months. The fractured completely healed clinically and radiographically at around 3 months.
| Discussion|| |
Osteomalacia is highly prevalent even in apparently healthy looking Indian population, although this is easily preventable and treatable condition. This case is of particular importance as it highlights the tip of the iceberg of this problem. It shows that even apparently healthy Indians are susceptible to osteomalacia, more so during pregnancy and lactation. There is extensive literature available related to pregnancy and osteomalacia, but there are very few research papers on lactation and osteomalacia in Indians. This case appears to be the first to describe atraumatic fracture neck femur due to prolonged lactation. There is usually a delay in presentation to the hospital on part of the patient as it presents with vague symptoms and later as gradually increasing pain. There may be delay in diagnosis and hence treatment, in the initial stage by treating physician because of atraumatic presentation, vague patient complaints, and subtle plain radiographic findings. Fracture neck femur has the propensity for complications like delayed union, non-union, and avascular necrosis of head femur and hence this assumes greater significance.
Most of the Indians both upper and lower socioeconomic classes, as well as urban and rural, are prone to Vitamin D deficiency and may have subclinical rickets or osteomalacia. Vitamin D deficiency has shown to have negative skeletal consequences including secondary hyperparathyroidism, increased bone turnover, enhanced bone loss, and fracture risk. ,,
Serum or plasma 25-hydroxyvitamin D [25(OH) D] concentrations of 10-25 nmol/L due to prolonged and severe clinical vitamin D deficiency leads to rickets in children and osteomalacia in adults.  Serum concentration of 25-hydroxyvitamin D3 [25(OH) D3], which is recognized as the functional status indicator for Vitamin D, of 80 nmol/L are associated with reduced calcium absorption, osteoporosis, and increased fracture risk.  Requirement of calcium and vitamin D is increased during pregnancy and lactation as understood by the fact that the fetus at term requires calcium at the rate of 250 mg/d and lactating women excretes approximately 210 mg/day of calcium in breast milk 2 . The calcium loss is four times higher in near exclusive breast feeding for 6 months during lactation as compared to pregnancy.  Long term vitamin D deficiency can lead to osteomalacia as a result in increased parathyroid hormone concentrations and decreased serum 1,25(OH) 2D concentrations. 
The practice of breastfeeding in India is still widely prevalent,  is universal, on demand and prolonged, at times for up to 4 to 5 years.  Estimated calorie expenditure of lactating mother is high and varies between 400 and 700 kcal/day. The anthropometric indices in lactating women showed a progressive fall with increasing duration of lactation until 18 months in women whose infants were mainly on breast milk.  In India women do not consume more food during pregnancy and lactation and also the intake of calcium and micronutrients is low throughout this period. 
Although current evidence suggests that, there are physiological mechanisms that help the necessary calcium transfer across the placenta and mammary gland and these mechanisms are not responsive to increases in calcium intake and there may not likely to be an additional requirement for vitamin D during pregnancy and lactation, but this may not be the case in women who have poor vitamin D status before, during, and after the pregnancy. 
The mechanisms suggested are maternal metabolic changes like increased intestinal calcium, renal calcium retention, and decrease in urinary calcium losses which contribute to fulfil the calcium needs of the breast milk. ,, However, these metabolic changes are often not sufficient to meet breast milk calcium needs especially in women already deficient in calcium rich diet and vitamin-D, therefore to meet these needs calcium is resorbed from the maternal bone and that the greatest losses occurred in the spine and femoral neck. Mechanisms are working to balance the breast milk calcium but at the cost of mothers bone and its resorption. 
Although there are studies to suggest that this compensatory bone loss often seen in the early period of lactation usually comes back to normal, although slowly, after lactation has stopped or during weaning, this may be true for women with positive calcium and vitamin-D reserves and with normal healthy diets. In women with habitually low calcium intakes (<500 mg/d), increasing calcium intake improved calcium balance, which, in turn may lessen bone losses during lactation. There may be a threshold above which increased calcium intake will have no effect on bone loss as suggested by the evidence that there is improvement in calcium balance in women with low calcium intakes and also the fact that there is lack of effect of calcium supplementation during lactation. This threshold is variably quoted as likely to be 800-1000 mg, which is equal to recommended intake in adults. But it appears from various research studies especially from Indian subcontinent that routinely this threshold is usually not crossed positively by even most of the apparently healthy Indians. ,,,
Most non-pregnant and non-lactating Indian females are at risk of osteomalacia and more so during pregnancy especially if they are without supplementations and the same situation if carried forward to lactation, will subject them and their infants at risk of rickets, osteomalacia, compromised skeletal growth, and other outcomes. , Thus, most of the researchers suggest the need for increased awareness among health professionals and the public, policy makers about the importance of safe sunshine exposure and consumption of dietary vitamin D by women of reproductive age at the risk of vitamin D deficiency. ,,,
It would be worth studying women who are Vitamin-D deficient before, during, and after pregnancy especially with long term lactation and we believe that these observations relating to the risks of hypovitaminosis D would have important public health implications in a developing country like India. 
The first case report was in 1985 on bilateral loser`s zones in neck of femur of an Asian pregnant lady, who was treated conservatively with oral vitamin D and calcium which resulted in good healing. The study recommended supplementation of pregnant Asian women with vitamin D on a routine basis to ensure adequate vitamin D stores in these women and their new born which would in turn help adequate mineralization of their skeletons.  A case report of atraumatic displaced fracture of femur neck due to pregnancy induced osteomalacia was published in 2003. It was managed by close reduction internal fixation followed by oral calcium and vitamin D supplementation.  Probably the first case of atraumatic bilateral displaced fracture of neck femur due to osteomalacia during pregnancy of a Asian woman was documented in 2011, which went on to heal completely in spite of delay in treatment with internal fixation, calcium, and vitamin-D supplements.  The dietary reference intake (DRI) of 400 IU/d vitamin D for lactating mothers was irrelevant and it was recommended that the maternal vitamin D intakes of 4000 IU/d appeared to be safe, to provide sufficient vitamin D, and to ensure adequate nutritional vitamin D status for both mothers and nursing infants. The study however suggested that additional detail studies will be required to determine the optimal vitamin D supplementation regimen for lactating women. 
The causes for the high incidence of vitamin D deficiency and thus rickets and osteomalcia in India are multi factorial, like inadequate dietary intake, lack of fortification of food with vitamin D, altered vitamin D metabolism in Indians, inadequate sunlight exposure, and dark skin pigmentation. Those with lower dietary intakes if supplemented with calcium and vitamin D have shown increase in bone density and reduced incidence of hip fractures. 
| Conclusion|| |
Although atraumatic fracture of neck of femur due to lactational osteomalcia is rare, lactational osteomalacia is just the tip of the iceberg of a problem that is prevalent in Indian sub-continent even in apparently healthy population. Thus, we have to be constantly aware and open to deal appropriately with the adverse effects of sub-clinical and overt osteomalacia on the skeletal health, with its varied presentation especially in this susceptible population. Osteomalacia can be prevented by public awareness, calcium and vitamin-D supplementation during pregnancy and lactation and by appropriately restricting the period of lactation. This case of atraumatic fracture of neck femur due to prolonged lactation appears to be first case report of its kind. This case was managed well by in situ internal fixation using cannulated cancellous screws, oral calcium and vitamin-D supplementation, and patient awareness. It appears rather surprising that in Indian subcontinent, a totally preventable nutritional disease still prevails.
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[Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5]