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OSTEOPOROSIS Kristen M. Nebel, DO March 10, 2010.

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Presentation on theme: "OSTEOPOROSIS Kristen M. Nebel, DO March 10, 2010."— Presentation transcript:

1 OSTEOPOROSIS Kristen M. Nebel, DO March 10, 2010

2 O BJECTIVES Define Review Bone pathology Review risk factors, updated screening recommendations, evaluation Male Osteoporosis Skilled care and osteoporosis Prevention and Treatment Vertebral Fracture management

3 O STEOPOROSIS Definition: A disease characterized by low bone mass and microarchitechtural deterioration of bone tissue leading to enhanced bone fragility and a consequent increase in fracture incidence. WHO: BMD T-score of -2.5 or less

4 S TATISTICS Effects approx. 8 million women in US 22 million women with osteopenia By million men and women Risk of fragility fractures 250,000 hip and 500,000 vertebral/ year in women MORE trial: Risk of osteoporotic fracture > risk of CV event (MI or CVA) or breast CA Risk of 2 nd vertebral fracture within one year is 20%

5 S TATISTICS Impact of osteoporosis-related fractures: 2005 estimated Healthcare cost:$17 billion 432,000 hospital admissions 183,000 skilled care admissions (NOF.org)

6 B ONE P ATHOPHYSIOLOGY Bone Strength Related to bone mass (measured by BMD) and other factors, such as remodeling frequency (bone turnover), bone size and area, bone microarchitechture and degree of bone mineralization

7 B ONE P ATHOPHYSIOLOGY Normal: Cyclic bone remodeling Osteoclasts: The mineral content of matrix is first dissolved and the remaining protein components of the matrix (primarily collagen) are then degraded by proteolytic enzymes secreted into the resorption space.

8 B ONE P ATHOPHYSIOLOGY Normal bone remodeling: Osteoblasts: Synthesize new bone by first laying down a new protein matrix, principally composed of Type I collagen into the resorbed space. Individual collagen molecules become interconnected by formation of pyridinoline cross-links to provide extra strength. Bone mineralization occurs with deposition of hydroxyapatite.

9 B ONE P ATHOPHYSIOLOGY Bone Turnover Markers Formation: bone-specific alkaline phosphatase and osteocalcin Resorption: carboxy terminal peptides of mature collaged (N-telopeptide and C-telopeptide) and deoxpyridinoline

10 S OMETHING S OMEWHERE W ENT T ERRIBLY W RONG

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12 B ONE P ATHOPHYSIOLOGY Abnormal: Imbalance of remodeling High bone turnover rate leads to weakening due to weaker trabecular/ cancellous bone

13 B ONE M ASS C HANGES Peaks by mid-30’s Bone loss begins several years prior to menopause Risk of fracture increases with BMD loss Compared to younger women: odds of having OP in y/o is 5.9x higher and in y/o is 14.3x higher Genetic factors contribute 80% to a women’s risk of osteoporosis BMD is likely to be lower in women with + FHX of osteoporosis than those without. Risk of hip fx: 50% greater if 1 st degree relative had + fx 127% greater if parent had hip fx

14 O STEOPOROSIS : C ONSEQUENCES Reduced QOL Increased mortality (20%) Failure to return to baseline (50%) Depression

15 R ISK F ACTORS FOR O STEOPOROTIC F ALLS : NOF Body weight <70kg or BMI<21 Corticosteroids Personal history of fractures as adult First-degree relative with fragility fracture Current smoking Early menopause Nutrition Decreased activity ETOH Impaired vision Dementia Poor health Recent falls

16 F RACTURE R ISK A SSESSMENT (FRAX) Introduced in 2008: WHO’s new guide to identify an individual’s 10-yr risk of osteoporotic fracture Goal: Ensure that those at high risk are treated Accounts for nine clinical risk factors +/- hip BMD Allows for calculation even if no BMD available Designed to decide who and when to newly treat (not for those currently on treatment) Therapy indicated if 10-yr. risk of hip fracture >/= 3% or other major fracture risk >/= 20% Cut-off for therapy based on new cost-effective treatment thresholds (Tosteson et al. Osteop. Int. 2007)

17 FRAX Does not apply to premenopausal women and men < 50 y/o

18 BMD T ESTING R ECOMMENDATIONS USPSTF/ NOF ALL women 65+ MEN >/= 70 Younger postmenopausal women and men with clinical RF’s Adults with fracture after age 50 Adults with a condition or a medication a/w low bone mass Perimenopausal women with high-risk risk factors (ie-meds, low BMI, h/o low-trauma fracture)

19 S CREENING M ETHODS Dual-energy x-ray absorptiometry = preferred Femoral neck BMD is best predictor of hip fx Forearm BMD predicts non-hip fractures Ultrasound densitometry (sahara screen)

20 S CREENING AND M EDICARE C OVERAGE (ICD-9 CODES ) Medicare covers BMD testing for the following individuals 65 and older Estrogen deficient women at clinical risk for osteoporosis (627.2) Individuals with vertebral anomalies (733.90) Individuals receiving, or planning to receive, long-term glucocorticoid therapy of at least 5mg for 3 months (V58.69) Individuals with primary HPTH (252.00) Medicare permits repeat BMD testing every 2 years

21 O STEOPOROSIS E VALUATION “Silent fractures” Check for loss of height (>5cm) Up to 70% of vertebral fractures may be asymptomatic In an evaluation of 2 primary care offices only 38% of patients with a history of vertebral fracture were evaluated for and treated for osteoporosis. (Neuner et al. JAGS 2003)

22 M ALE O STEOPOROSIS Morbidity and mortality much higher in men than women with osteoporotic fracture Secondary causes more common accounting for 50% ETOH (15-20%), glucocorticoid (20%), and hypogonadism (15-20%) Androgens may inhibit bone resorption 3-6% of men in US (NHANES III study) 28-47% with osteopenia 1/3 of men 60+ are likely to have an osteoporotic fracture Average onset is 10 yrs later than in women Men often asymptomatic at onset

23 M ALE O STEOPOROSIS Previously, no formal recommendations Now, WHO recommends BMD for ALL men >70 Men with risk factors BMD should be compared to male references so that osteoporosis diagnoses are not missed BMD of hip is most reliable indicator due to prevalence of spinal degenerative changes

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25 O STEOPOROSIS E VALUATION When to suspect secondary causes: Premenopausal women Patient without risk factors Men <70 Multiple health problems Worsening osteoporosis despite therapy

26 S ECONDARY C AUSES Medications Renal insufficiency  secondary HPTH Cushing’s Hyperthyroid Multiple myeloma Osteomalacia Paget’s Dz GI malabsorption / celiac Mets to bone

27 O STEOPOROSIS E VALUATION Labs CMP, phosphate, CBC, ESR, TSH/FT4 Testosterone/ Estrogen SPEP 24 hour urine for calcium and creatinine 25-OH Vit. D Intact PTH Biochemical markers of bone turnover Imaging X-rays not good for early detection: 20-40% of BMD must be lost to detect

28 O STEOPOROSIS AND S KILLED C ARE : T O T REAT OR N OT TO T REAT ? AMDA 2004 Quality Indicators: Prevention: Within 1 month of admission all females to be offered Calcium, vitamin D, and weight-bearing exercises. Mobilization: Attempted in bedfast individuals unless contraindicated New Dx: Calcium and Vitamin D started within 1 month New Dx: Therapy started within 3 months Corticosteroid tx for > 1 month: start calcium New Dx: Evaluate meds for secondary causes New Osteoporotic fx in ambulatory resident: Physical therapy should be started within 1 month

29 O STEOPOROSIS AND S KILLED C ARE : T O T REAT OR N OT TO T REAT ? Osteoporosis present in up to 80% of residents Most significant independent RFs for fracture Low BMD and dependence for transfers (>3x fracture risk of those w/o low BMD) (Duque et al. JAMDA ’06) Dx in LTC BMD not always appropriate Quebec Symposium for LTCI: Diagnosis based on patient risk factors, physical exam (kyphosis, fractures), x-ray and loss of height Calcaneal BMD Vitamin D level

30 O STEOPOROSIS AND S KILLED C ARE : T O T REAT OR N OT TO T REAT ? Studies estimate that therapy for osteoporosis, including calcium and vitamin D, is prescribed in only 9-20% of residents with documented disease. (Wright. JAMDA 2007) Factors contributing to lack of prescribing Compliance Tolerance Price Risk vs. Benefit Life expectancy, ambulation, time to efficacy

31 G ENERAL T REATMENT AND P REVENTION R ECOMMENDATIONS Nutrition Calcium Dose increases with age due to decreased absorption Decrease bone loss by 1%/ yr. Greatest benefit in elderly, late-menopausal, and those with low baseline calcium intake Vitamin D Recommended intake IU Meta-analysis (JAMA) showed reduced risk of hip and non-vertebral fractures with IU/day Natural sources: fatty fish, fish liver oils, and fortified foods (milk = 400 IU /qt.)

32 G ENERAL T REATMENT AND P REVENTION R ECOMMENDATIONS Calcium and Vitamin D Augmentation of other agents Studies of etidronate in individuals with Vitamin D > 40 showed greater increase in BMD measured at L-S and femoral neck compared with levels < 40 (Boonen et al. JAGS 2004) Given to all on osteoporosis therapy Patients receiving corticosteroids RA patients on prednisone lost 1-2% BMD/ yr. Those randomized to calcium (1000mg/d) and Vit. D (500IU/d) gained BMD at about 0.5%/yr. Those with or at risk of deficiencies Secondary HPTH due to hypovitamin D showed improved BMD on Alendronate and Vit. D compared with those only on Alendronate (Baron et al. JAGS 2005)

33 G ENERAL T REATMENT AND P REVENTION R ECOMMENDATIONS Caffeine Recommend < 4 cups/ d May reduce calcium absorption Some association with increased bone loss and fracture rates Vitamin K May help with bone metabolism and reducing urinary calcium excretion No recommendations for supplementation No association between Coumadin and fractures

34 G ENERAL T REATMENT AND P REVENTION R ECOMMENDATIONS Vitamin A RDA of 700 micrograms High levels have been associated with increased risk of hip fracture in 2 out of 3 studies Magnesium Some epidemiologic studies showed correlation with increased BMD in elderly and females Easily obtained in daily food intake Deficiencies may exist in elderly and those with GI malabsorption ETOH Can suppress osteoblasts Moderate intake (1-2 oz/week) in women 65+ is associated with higher BMD and decreased risk of hip fracture Heavy intake (>7oz/week) increases risks of falls and hip fractures

35 N ON - PHARMACOLOGIC I NTERVENTIONS Rehabilitation Exercise Strengthening muscles: backs and legs Prospective 10-year study showed decreased risk of vertebral fractures (Sinaki) Orthotics Gait training Pain Management Avoiding substances of abuse

36 P HARMACOLOGIC O PTIONS Who to treat (NOF Clinician’s Guideline 2008) Treatment: Postmenopausal women and men 50+ with BMD T-score of -2.5 or less Any hip or vertebral fracture BMD T-score of -1.0 to -2.5 AND prior fracture (new) BMD T-score of -1.0 to -2.5 AND secondary causes a/w high risk of fracture BMD T-score of -1.0 to -2.5 AND 10-yr prob. of hip fx >/= 3%, major fx >/= 20% Prevention Women with BMD hip T-score of -2.0 or less and no risk factors Women with BMD hip T-score of -1.5 with one or more risk factors and does not meet FRAX criteria

37 P HARMACOLOGIC O PTIONS Antiresorptives Estrogens/HRT Selective-estrogen receptor modulators (SERMS) Calcitonin Bisphosphonates Anabolic PTH

38 E STROGENS /HRT Recommended for prevention only WHI: 5 years - 16K women ages (mean 63) w/ uterus and no screening for osteoporosis Increase in BMD Decrease in hip, vertebral, and other osteoporotic fracture rates Increased risk of CV events, VTE, and Breast CA; decrease in colon CA

39 SERMS: R ALOXIFENE (E VISTA ) Prevention and Treatment of postmenopausal OP Vertebral fracture risk Daily oral dosing Modest increase in BMD of spine and hip; decreases bone turnover Multiple Outcomes of Raloxifene Evaluation (MORE): 3 year study of 7,700 women with OP Postmenopausal OP +/- previous vertebral fracture Insignificant results: 30% and 50% reduction in risk of vertebral fracture Side effects: hot flashes, leg cramps, increased VTE

40 C ALCITONIN (M IACALCIN ) Treatment of postmenopausal OP (at least 5 yrs.) only Patients unable to tolerate other agents Daily dosing as nasal spray, SC injection, and oral Minimally inhibits bone resorption; possible analgesic effect for acute vertebral fx PROOF trial: At 5 yrs 33% reduced risk of new vertebral fx (200 mcg). After 5 yrs, increased dose (400 mcg) required to perpetuate BMD increase Side effects: nasal irritation, nausea, local inflammation and flushing

41 B ISPHOSPHONATES : A LENDRONATE (F OSAMAX ) Prevention and Treatment of Male and Postmenopausal OP, Treatment of Glucocorticoid-induced OP Daily or weekly dosing; oral form (tab or liquid) Inhibits osteoclasts, Increases BMD + h/o spine fx: Reduces risks of all osteoporotic fractures by 50% over 3 yrs. (NOF) - h/o spine fx: Reduces incidence of spine fx by 46% over 3 yrs. Side effects: Gastric irritation and ulcers, CrCl <35, hypocalcamia, ONJ

42 O STEONECROSIS OF THE J AW American College of Rheumatology position paper Case review found 60% of cases to be following oral surgery or dental extraction. 94% of the cases occurred with IV bisphosphonates (Pamidronate or Zoledronic acid) and 85% had MM or metastatic breast CA to bone. Non-cancer patients and oral meds not considered risk factors Recommendations to avoid ONJ: treating infections and obtaining routine dental care prior to therapy Appearance of intraoral lesion with exposed bone +/- painful ulcers, ragged

43 R ISEDRONATE (A CTONEL ) Prevention and Treatment of Glucocorticoid- induced, male, and Postmenopausal OP Daily, weekly, or monthly (75mg on 2 consecutive days) dosing, oral form only + h/o spine fracture reduces risk of spine fracture by 41-49% and hip fractures by 36% over 3 yrs. (NOF) Polled data of VERT and HIP trials for women 80+ with OP showed NNT = 12 to prevent 1 new vertebral fracture after 1 year of therapy. After 3 years of therapy NNT = 16

44 I BANDRONATE (B ONIVA ) Prevention and Treatment of Postmenopausal OP Dosing: IV q 3 months or orally daily or monthly Decreases risk of vertebral (not hip) fracture by 50% over 3 yrs. RCT by Delmas et al: Comparison of oral and IV dosing 1400 women with OP of lumbar of lumber spine At 1 year lumbar/ femur BMD greater in IV group greater than PO Side effects: flu-like illness with 1 st infusion, GI upset, arthralgias

45 Z OLEDRONATE (R ECLAST ) Treatment of Postmenopausal OP Dosing: 5mg IV yearly Reduces incidence of spine fracture by 70%, hip fractures 41%, and non-vertebral fx 25% over 3 yrs. Side-effects: Acute phase reactants (arthralgia, HA, myalgia, fever)- may pretreat with Tylenol Risk of side effects tapers with subsequent dosing

46 B ISPHOSPHONATES AND A TRIAL F IBRILLATION Conflicting reports from population-based case controlled studies Reanalysis of several trials did not show increased risk of atrial fibrillation. Current recommendations are not to withdraw therapy

47 PTH (1-34): T ERIPERATIDE (F ORTEO ) Treatment of high risk postmenopausal and male OP T-score of -3.5, fractures + T-score -2.5, and those who fail 2 yrs of bisphosphonate therapy Daily SC injections (only approved for 2 years duration) Anabolic: Stimulates osteoblast activity-> increased trabecular bone density

48 PTH (1-34): T ERIPERATIDE (F ORTEO ) Side effects: dizziness, leg cramps, osteosarcoma seen in rat trials Contraindications: Paget’s disease of bone, prior radiation therapy of the skeleton, bone metastases, hypercalcemia, or a h/o skeletal malignancy

49 PTH (1-34): T ERIPERATIDE (F ORTEO ) “Fracture Prevention Trial”: 20mcg/d reduced vertebral and non-vertebral fractures by 65% and 53%, respectively Review of FPT to assess safety and efficacy in women 75+ compared with younger women found that lumbar and femoral neck BMD both increased significantly and new vertebral fractures risk NNT =11 (Boonen et al. JAGS 2006) Limitation of study: Subjects were ambulatory w/o significant comorbidities.

50 C ONCURRENT T HERAPY Synergism: Teriperatide and Alendronate? Small RCT 83 men: Spine and femoral neck BMD increased greatest in PTH only group Alendronate impaired PTH anabolic activity (Finkelstein et al. NEJM 2003) Recommended that bisphosphonate therapy follows PTH (Teriperatide). Simultaneous use of bisphosphonate and other not generally recommended

51 E VALUATING T REATMENT E FFICACY Repeat BMD testing every 1-2 years while patient on therapy Step-up therapy Ensure compliance Evaluate for secondary causes if no improvement

52 S TOPPING T HERAPY No real guidelines Study to compare stopping Alendronate after 5 years vs. continuing x 10yrs. Discontinuing Alendronate after 5 years showed moderate decline in BMD No significant change in nonvertebral fractures Slight increase in clinical vertebral fracture risk Stopping for up to 5 years does not significantly increase fracture risk Patients with very high fracture risk may benefit from continued therapy (JAMA. 2006;296: )

53 F UTURE T HERAPIES Denosumab Monoclonal Ab against RANKL: inhibits osteoclasts FREEDOM trial (NEJM 2009:361:756-65) 3 year study, >7500 postmenopausal women (60-90) with low BMD received med vs placebo Improved BMD of LS (10%) and total hip (4%) Reduced biochemical markers Reduced incidence of new vertebral, hip, and nonvertebral fractures Vs. Alendronate Slight increase BMD with Denosumab (NEJM 2006;354:821) Similar side effects BMD gain is reversal with stopping medication

54 F UTURE T HERAPIES Strontium ranelate Decreases osteoclast/ increases osteoblasts ? Antiremodeling effect Cochrane Review: Daily treatment x 3 years vs placebo- Decrease in vert fx (37%), nonvert fx (14%). NNT=9 Tibolone Synthetic steroid with estrogenic, androgenic, and progestagenic properties  increase BMD Growth Hormones

55 M ANAGEMENT OF V ERTEBRAL F RACTURES Limited clinical occurrences Conservative Oral pain management Physical therapy Surgical Kyphoplasty Vertebroplasty

56 K YPHOPLASTY Balloon creates a cavity in vertebral body in which to inject cement Restores vertebral body height in 70% Reduces fracture Partially corrects kyphosis Complications: nerve damage and bleeding Pain relief in 80-90% Studies vs. conservative treatment show benefit in short-term f/u but not long-term (Lancet Mar 21;373(9668): )

57 V ERTEBROPLASTY Fluoroscopic procedure where cement is injected into vertebral body Prevents further collapse, does not restore height Pain relief within 48 hours generally, effective in 75-90% Complications: fracture of pedicle, psoas muscle hemorrhage, cement leakage, ARDS

58 V ERTEBROPLASTY Indications : Painful osteoporotic fractures Painful vertebrae secondary to invasion of tumor Painful fracture a/w osteonecrosis Any fracture where inflammation/ edema present on imaging (at least 2 weeks old). Contraindications: Asymptomatic vertebral compression fracture Ongoing local/ systemic infection Retropulsed bone fragment causing myelopathy Uncorrectable coagulopathy Physical obstruction of spinal canal (JVIR 2003)

59 V ERTEBROPLASTY 2 recent studies showed no significant improvement in pain or function following vertebroplasty vs. sham procedures (NEJM 2009:361:569-79, NEJM 2009: 361: )

60 T HE E ND


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