Radiological morphology variances of transient osteoporosis of the hip

Background

Although several morphological abnormalities or variances of the hip joint have been proposed to be associated with hip joint degeneration, few studies have investigated any radiological features in patients with transient osteoporosis of the hip (TOH). The purpose of this study is to evaluate the morphological variances of the hip joint in TOH patients radiographically.

产后早期妇女骨质疏松相关因素分析

目的：了解产后早期妇女骨量丢失的影响因素,为防止妊娠有关的骨质疏松发生提供依据。方法纳入在我院分娩的产后10～14天妇女1125例,采用双能X线骨密度测定仪测定受试者L1-L4椎体及左侧股骨颈的骨密度（BMD）,根据骨密度分为骨质疏松组、骨量减少组、骨量正常组,比较各组间年龄、身高、体重指数（ BMI）、产次、钙摄入量等差异。结果在1125例调查者中,骨质疏松65例（5.8％）,骨量减少429例（38.1％）,骨量正常631例（56.1％）。牛奶摄入量每天＞200 ml的产妇,其骨质疏松发生率低于牛奶每天摄入＜200 ml的产妇（ P＜0.01）。孕期补钙的产妇骨质疏松发生率低于未补钙者（ P＜0.01）,有骨质疏松家庭史的产妇,其骨质疏松发生率高于无骨质疏松家庭的产妇（P＜0.01）。结论产后妇女骨质疏松及骨量减少的发生率较高,骨质疏松家族史、钙摄入不足、低BMI是产后骨量丢失的风险因素,产后常规测量骨密度有助于骨质疏松的早期诊断及治疗。     

The natural history of bone bruise and bone remodelling in the traumatised hip: A prospective 2-year follow-up study of bone bruise changes and DEXA measurements in 13 patients with conservatively treated traumatic hip dislocations and/or fractures

IntroductionThe purpose of this study was to assess the natural history of bone bruise and bone mineral density (BMD) after traumatic hip dislocations and conservatively treated acetabular fractures. Our hypothesis was that poor bone quality can influence degree of bone bruise and, in time, cause degenerative changes.Materials and methodsEight consecutive patients with traumatic hip dislocations and five patients with conservatively treated fractures in the femoral head and/or acetabulum were included. Magnetic resonance imaging (MRI) was obtained after 1, 17, 42, 82 and 97 weeks. Dual-emission X-ray absorptiometry (DXA) measurements were made after 10 days and 2 years. Sizes of bone bruise lesions were measured and classified. At the 2-year follow-up, Harris hip score (HHS) was calculated and signs of radiological osteoarthritis (OA) registered.ResultsThe bone bruise changes were small and all changes resolved within 42 weeks in all, except for three patients; one with a small Pipkin fracture had segmental avascular necrosis (AVN) of the femoral head, one had persisting1–3 mm small spots of bone bruises in the femoral head and the third had <1 cm lesions in both the femoral head and the acetabulum. The lesions were bigger in the femoral head in the hip dislocations and more pronounced in the acetabulum in the fractured acetabuli. We found no significant changes in BMD in four regions of interest (ROIs) after 2 years. No patients developed OA, and all had excellent HHS except for the one patient with AVN.ConclusionThe post-traumatic bone bruise changes in the dislocated hips and the fractured acetabuli were small and transient compared to findings of other authors examining traumatised knees. The patients had excellent function and no OA after 2 years if they did not develop AVN. In our small sample of relatively young patients with normal age-adjusted BMD, no post-traumatic osteopenia was observed. This might differ in the elderly with poorer bone quality; further studies are needed to assess that.     

Fate of subchondral fatigue fractures of femoral head in young adults differs from general outcome of fracture healing

PurposeThe purpose of this study is to report the clinical course of fatigue-type subchondral fractures of the femoral head in young healthy adults.Materials/MethodsWe retrospectively reviewed 28 consecutive patients (34 hips) who had a clear history of a sudden increase in physical activity without trauma on the hip and pelvis, and were diagnosed as having a fatigue-type subchondral fracture of the femoral head. The diagnosis was made primarily on the basis of sequential plain radiographs and magnetic resonance images.ResultsOf the 34 hips, 19 hips with no bony collapse experienced gradual disappearance of subjective pain a few months after onset, and there were no recurrences. Other 2 hips that showed bony collapse, but preserved the articular margin, also experienced no definite deterioration of collapse or arthritic change and did not need surgical intervention. In the remaining13 hips with bony collapse and destroyed articular margin or arthritic change, hip pain gradually worsened necessitating surgery.ConclusionsThe current findings suggest that a subchondral fatigue fracture of the femoral head could show a different severity of subchondral injury over time. In the collapsed subchondral fatigue fractures, especially when combined with head incongruency, the hip pain was aggravated enough to require surgical intervention.     

股骨颈骨折内固定术后股骨头坏死的相关因素分析及生活质量评价

目的:探讨年轻患者股骨颈骨折内固定术后发生股骨头坏死的危险因素,描述股骨头存活患者的生活质量,量化其预测因素。方法:选取2013年1月至2016年12月采用闭合复位空心钉内固定手术治疗的股骨颈骨折患者172例(174髋)进行回顾性分析,总结患者的一般资料包括年龄、性别、体重指数、创伤机制、创伤-手术间隔时间、创伤发生季节和内固定物是否取出,影像学资料包括骨折Garden分型、Pauwel分型、股骨头后倾角度、术后骨折复位、螺钉分布情况。进行单因素分析及多因素Logistic回归分析,探讨股骨头坏死及内固定失败的危险因素。对上述内固定术后股骨头存活的患者进行随访,通过SF-36健康调查简表评估患者的生活质量,髋关节功能Harris评分评估患髋关节功能,并通过多重线性回归分析探讨股骨颈骨折术后患者生活质量的预测因素。结果:172例(174髋)患者纳入研究,共29例(16.67%)患者发生股骨头坏死。股骨头坏死多因素Logistic回归分析中有显著差异的变量是复位质量(OR=0.126,P=0.027)和后倾角(OR=4.380,P=0.010)。股骨头存活136例患者(137髋)纳入生活质量调查,Harris评分90.14±7.92,其中优96髋(70.07%),良28髋(20.44%),中13髋(9.49%),差0髋。SF-36评分中生理健康得分为46.12±9.12,心理健康得分为50.21±3.97,两者不呈线性相关(P0.05),多重线性回归分析中,与生理健康得分相关有显著差异的变量是复位质量与后倾角度,与心理健康得分相关有显著差异的变量是骨折是否移位与创伤机制。结论:复位质量位不佳和后倾角15°是并发股骨头坏死的危险因素。股骨颈骨折术后患者髋关节功能及心理健康得分恢复良好,但生理健康得分不能恢复到正常人群平均水平,复位质量与后倾角度可作为生理健康得分预测因素,骨折是否移位与创伤机制可作为心理健康得分的预测因素。     

The prevalence of significant left-right differences in hip bone mineral density

Introduction We determined the prevalence of left-right differences in hip bone mineral density (BMD) by dual-energy x-ray absorptiometry (DXA) and the resultant consequence, namely: the frequency at which patients would be classified differently if lumbar spine and only one hip (rather than both hips) were measured.Methods This was a retrospective DXA scan reanalysis of 3012 white women ≥50 yrs who had scans of both hips using Hologic DXA systems. The difference between left and right hips was considered significant if it exceeded the least significant change (LSC) for any of three hip subregions (total hip, femoral neck, trochanter). The number of women with osteoporosis in both hips, the left hip only, or the right hip only was determined by lowest T-score from total hip, femoral neck, or trochanter.Results Despite high left-right correlations of subregion BMD, significant left-right differences in BMD were common: the difference exceeded the LSC for 47% of women at total hip, 31% at femoral neck, and 56% at trochanter. Left-right differences in BMD that exceeded the LSC affected the percent agreement of left-right hip classification: for all women irrespective of spine status, there was 77% classification (diagnostic) agreement in hip pairs in which the left-right hip BMD difference exceeded the LSC versus 87% agreement in which LSC was not exceeded (significant difference in proportions, P<0.0001). The greatest risk of different classification would occur in women with normal spines as the diagnosis might be determined by hip T-scores. Using L1-4 lumbar spine T-scores, 1229 women were normal at the spine. Twenty-four (2%) were osteoporotic at both hips. However, 12 women (1%) were osteoporotic only in the left hip (significantly different from zero, P<0.001) and 11 (1%) only in the right hip (P<0.001); of these 23 women, the difference in BMD between the osteoporotic hip and the contralateral hip exceeded the LSC in 16 (70% of those with osteoporosis in only one hip). Using L1-4 lumbar spine T-scores, 1159 women were osteopenic at the spine. Of these, 126 (11%) were osteoporotic at both hips, 54 (5%) only in the left hip (P<0.001), and 42 (4%) only in the right hip (P<0.001); of these 96 women, the difference in BMD between the osteoporotic hip and the contralateral hip exceeded the LSC in 56 (58% of those with osteoporosis in only one hip).Conclusions A statistically significant number of women with osteoporosis are potentially classified differently when scanning only one hip as a result of the high prevalence of left-right differences in BMD. Although the percentages are low, the total number of women affected may be large. From a public health perspective, the practice of scanning both hips could potentially identify more women with osteoporosis and may help prevent future hip fractures.     

Effect of raloxifene on the risk of new vertebral fracture in postmenopausal women with osteopenia or osteoporosis: a reanalysis of the Multiple Outcomes of Raloxifene Evaluation trial

Raloxifene reduces vertebral fracture risk in postmenopausal women with osteoporosis and established osteoporosis, but its efficacy in women with osteopenia has not been studied. The objective of this study was to evaluate the effect of raloxifene hydrochloride on the risk of vertebral fractures in postmenopausal women with osteopenia and to compare this effect with that in women with osteoporosis as defined by the bone mineral density (BMD) T-score at the hip. We studied the 3204 postmenopausal women with osteopenia or osteoporosis without vertebral fractures at baseline in the Multiple Outcomes of Raloxifene Evaluation trial. Compared with placebo, 60 mg/day raloxifene reduced the risk of new vertebral fractures at 3 years independent of baseline total hip BMD. The relative risk for new vertebral fractures for the raloxifene group compared with placebo was 0.53 (95% CI, 0.32-0.88) for those with osteopenia and 0.31 (0.06-0.71) for those with osteoporosis. In raloxifene-treated women the rate of vertebral fracture was similar in women with osteoporosis (2%) to that in women with osteopenia (1.9%). For clinically apparent vertebral fractures, the relative risk of fracture in the osteopenia group for raloxifene was 0.25 (0.04-0.63) compared with placebo. There were no new clinical vertebral fractures in women with osteoporosis receiving raloxifene, whereas four occurred in the placebo group. We conclude that treatment with 60 mg/day raloxifene significantly decreases the risk of new vertebral fractures and new clinical vertebral fractures in postmenopausal women without baseline vertebral fracture who have osteopenia or osteoporosis.     

Ultrasound attenuation of the Os calcis in women with osteoporosis and hip fractures

Summary Bone ultrasound attenuation of the calcaneus, and vertebral and femoral bone density measured by dual photon absorption were determined in 22 women with osteoporosis, 10 women with hip fractures, and 29 normal, age-matched controls to determine the utility of the ultrasound technique as an indicator of axial osteopenia. Vertebral and femoral neck density and bone ultrasound attenuation were significantly decreased (P<0.01) in the women with osteoporosis and those with hip fractures. The sensitivity and specificity of bone ultrasound attenuation was 80% at a value of 50 dB/MHz. At 90% specificity the sensitivity of bone ultrasound attenuation was 65%. The results of this pilot study suggest that ultrasound attenuation, a safe, simple, and radiation-free procedure, may be utilized as an indicator of decreased axial bone mass.     

8例髋关节暂时性骨质疏松症的临床诊断与治疗

目的探讨髋关节暂时性骨质疏松症（transient osteoporosis of the hip,TOH）的临床表现、诊断、鉴别诊断、治疗及预后。方法2003年8月至2009年8月治疗8例TOH患者,男2例,女6例;年龄22—43岁,平均34．9岁。患者均为单侧发病,左侧5例,右侧3例。患者的患髋均表现有不同程度的突发急性疼痛或渐进性疼痛,同时伴有显著的跛行。患髋内旋轻度受限是主要的体征。症状出现后3—6周,x线片可见股骨头均匀广泛的骨质疏松,MR表现为弥散且一致的等低T1、长T2异常信号,脂肪抑制序列呈高信号。嘱患者在疼痛可忍受的条件下半负重行走,避免出现骨折等并发症;口服二膦酸盐和钙剂;剧烈疼痛时,可口服非甾体类抗炎药物缓解疼痛。结果临床治疗3个月后疼痛明显减轻,10个月后疼痛完全缓解,复查MR示病变完全消失。结论TOH是一种少见的疾病,无原因出现的髋关节疼痛和跛行是主要症状,X线片和MR可分别看到暂时性的骨质疏松和骨髓水肿。此病具有自限性,保守治疗可获得良好的结果,明确诊断是治疗的关键。     

Simultaneous, Bilateral Pathological Displaced Intracapsular Hip Fractures Occurring Spontaneously Secondary to Osteomalacia of Hypomagnesemic Origin: A Case Report and Review of the Literature

Abstract   Spontaneous fractures involving both of the femoral necks simultaneously are exceedingly rare events. We report a case of an elderly female who presented after breaking both femoral necks following a trivial fall, initially diagnosed as age-related osteoporosis. Both the hips were treated by hemiarthroplasty. The diagnosis was revised to vitamin D-resistant osteomalacia secondary to hypomagnesemia after histopathological confirmation and further investigations. We examine the different etiological factors and mechanisms operating in the causation of this rare injury and explore the possible role of magnesium in the pathogenesis of osteomalacia. Fractures may remain occult until late, leading to increased morbidity and mortality. The value of an early MRI is recapitulated, with emphasis placed on prevention and early fixation.     

Novel MRI-based score for assessment of bone density in operative spine patients

BackgroundGood bone quality is key in avoiding a multitude of afflictions, including osteoporotic fragility fractures and poor outcomes after spine surgery. In patients undergoing instrumented spine fusion, bone quality often dictates screw pullout strength, insertional torque, and vertebral body loading properties. While dual-energy X-ray absorptiometry (DEXA) screening is the current method of assessing bone mineral density, the majority of patients do not have DEXA measurements available before undergoing surgical instrumentation.PurposeTo create a simple magnetic resonance imaging (MRI)-based score to evaluate bone quality and evaluate the degree to which it correlates with conventional DEXA scores.Study Design/SettingRetrospective cohort.Patient SamplePatients ≥18 years of age undergoing spine surgery for degenerative conditions between 2013 and 2018.Outcome MeasuresCorrelation of the vertebral bone quality (VBQ) score with DEXA T-scores, and association between VBQ score and presence of osteopenia/osteoporosis.MethodsUsing noncontrast T1-weighted MRIs of the lumbar spine, the novel VBQ score was calculated for each patient. DEXA T-scores of the femoral neck and total hip were obtained and were compared with patient VBQ scores using linear regression and Pearson's correlation.ResultsAmong 68 patients included in this study, 37 were found to have osteopenia/osteoporosis (T-score < −1.0) based on DEXA. A greater VBQ score was significantly associated with the presence of osteopenia/osteoporosis with a predictive accuracy of 81%. VBQ scores correlated moderately with femoral neck T-scores, the lowest overall T-scores of each patient, and correlated fairly with total hip T-scores.ConclusionsThis is the first study to correlate the novel VBQ score obtained from MRIs with DEXA T-score. We found this score to be a significant predictor of healthy versus osteopenic/osteoporotic bone with an accuracy of 81%, and found that VBQ score was moderately correlated with femoral neck and overall lowest T-score.     

Epidemiology of diaphyseal and distal femoral fractures in Rochester, Minnesota, 1965-1984

Over the 20-year period from 1965 to 1984, 370 residents of Rochester, Minnesota experienced 402 femoral fractures exclusive of the hip, giving an overall incidence rate of 37.1 per 100,000 person-years (95% confidence interval, 33.4-40.8). Of these, 54 were subtrochanteric and 210 were diaphyseal, while 123 involved the distal femur and 15 were at unspecified femoral sites. Fifty-eight percent of these fractures were caused by severe trauma. The incidence of femoral fractures due to severe trauma was greatest in young patients, especially for diaphyseal fractures, and showed a male excess. One-third of the fractures were associated with moderate trauma and were responsible for the rising incidence rates with age at all three fracture sites. These increases were greater in women. Eighty percent of patients 35 years of age or older with fractures due to moderate trauma had prior evidence of generalized osteopenia or a condition likely to cause localized osteopenia in the fractured femur. These data confirmed similar findings from Sweden, providing evidence for a relationship between osteoporosis and femoral fractures distal to the hip.     

Bilateral spontaneous inter-trochanteric fractures of proximal femurs

INTRODUCTIONBilateral spontaneous inter-trochanteric fractures of the proximal femur are rare. We report an unusual case of bilateral intertrochanteric fractures of the proximal femur in a 92 year old lady.PRESENTATION OF CASEA 92 year old lady presented to us with one week history of pain in both hips and poor mobilisation. There was no history of mechanical fall. The initial plain films of the hips did not show any fractures and the diagnosis was made by MRI scans. She underwent bilateral fixation of the fractures with dynamic hip screws. After a period of rehabilitation she returned to the pre injury mobilisation status.DISCUSSIONBilateral spontaneous intertrochanteric fractures of the hip due to osteoporosis are not that common. These rare fractures are usually associated with major trauma, renal disease, osteoporosis, osteomalacia, long term corticosteroid treatment and epilepsy.CONCLUSIONEarly diagnosis with high index of suspicion and appropriate investigations are mandatory in the management of these fractures.     

Femoral neck bone mineral density and 10-year absolute fracture risk in a national representative sample of Bulgarian women aged 50?years and older

Summary

This study explored the epidemiology of osteoporosis in Bulgarian women (>50?years). Of the women included in the study, 16.8% had osteoporosis and 46.5% had osteopenia at the femoral neck. The mean 10-year absolute fracture risk was 13.4?±?9.2% (major fractures) and 2.8?±?5.2% (hip fractures). This study is the largest Bulgarian epidemiological osteoporosis trial.

Purpose

The aim of this study was to determine the prevalence of the major risk factors for osteoporosis and the 10-year absolute fracture risk in a national representative sample of Bulgarian women aged 50 and older.

Methods

This work is a part of the Bulgarian Osteoporosis Epidemiology Study. The National Statistical Institute selected a national representative epidemiological sample. A questionnaire was used allowing fracture risk calculation according to FRAX. Ten osteoporosis centers throughout the country participated. Bone mineral density (BMD) was measured at the femoral neck by dual X-ray absorptiometry. The statistical analysis was performed on a SPSS 13.0 for windows platform.

Results

A total of 1,331 women were included (mean age 63.8?±?8.3?years), divided into decades. Of them, 16.8% had osteoporosis and 46.5% had low femoral neck BMD. Their mean 10-year absolute fracture risk for major fractures was 13.4?±?9.2%, and for hip fractures 2.8?±?5.2%, respectively. The prevalence of some major risk factors for osteoporosis was as follows: height loss?>?3?cm??33.1% of all women; family history of hip fractures??4.1%; previous hip fractures??1.9%; previous vertebral fractures??2.3%; all fractures??23.3%; smoking??11.9%.

Conclusions

This study is the largest epidemiological osteoporosis trial in Bulgaria to date and allows assumptions about the prevalence of osteoporosis and fractures among women aged 50 and older in our country.     

MRI diagnosis of occult hip fractures

Background Most fractures of the proximal femur are easily diagnosed by conventional radiography. When the images are judged to be negative or equivocal and a clinical suspicion of fracture persists, another approach is to use magnetic resonance imaging (MRI) to help reach a diagnosis.

Methods In a prospective study running from November 1998 to December 2001, we registered all patients being examined by MRI who had had a negative or equivocal radiograph and where there was continued clinical suspicion of hip fracture.

Results 100 consecutive patients (67 women) were included, with an average age of 80 (37–100) years. The MRI examinations corresponded to 4% of the 2,350 patients admitted with hip trauma during the study period. 46 patients had a femoral neck or intertrochanteric fracture on MRI. 27 patients had other fractures. 18 had other findings on MRI, and 10 were interpreted as being negative, although one of these was a false negative. In a separate interobserver analysis, two experienced radiologists agreed on the diagnoses in 19/23 cases (kappa value 0.78). They agreed with a less experienced radiologist in 17/23 and 19/23 cases, respectively (kappa values 0.66 and 0.76).

Interpretation MRI is a useful tool for demonstration of occult hip fractures. In the absence of a hip fracture, another explanation for the patient’s pain and disability will often be given.     

Joint proprioception in the elderly with and without hip fracture

OBJECTIVES: Decreased proprioception may contribute to the risk of falls in elderly patients. The purpose of this study is to determine whether patients with hip fractures have decreased hip proprioception compared with aged-matched controls, and whether hip proprioception differs in patients with repaired fractures compared with patients who have undergone prosthetic hip replacement after hip fracture. DESIGN: Retrospective. PATIENTS/PARTICIPANTS: Both hips of twenty-four hip fracture patients and age-matched patients without hip fractures were studied. Hip fracture patients were divided into osteosynthesis (twelve hips) and hemiarthroplasty (twelve hips) groups. INTERVENTION: Reproducibility of index angles (thirty hip flexion and thirty hip abduction) were compared with a six-degree-of-freedom electrogoniometer (instrumented spatial linkage; angular accuracy +/-0.5 degrees). RESULTS: There was no significant difference (flexion, p > 0.20; abduction, p > 0.67) in joint proprioception between fracture and no fracture groups. Likewise, there was no difference (flexion, p > 0.99, abduction; p > 0.74) in joint proprioception between osteosynthesis and hemiarthroplasty groups. CONCLUSIONS: Joint proprioception of hip fracture patients was not found to be diminished compared with age-matched normal controls. Additionally, replacement of the femoral head did not reduce joint proprioception compared with osteosynthesis with an intact femoral head. Maintenance of the femoral head does not seem to be necessary for the maintenance of joint proprioception in elderly hip fracture patients.     

Treatment of osteonecrosis of the femoral head with core decompression and human bone morphogenetic protein

A retrospective evaluation was done of 15 patients (17 hips) with symptomatic osteonecrosis of the hip treated with core decompression combined with an allogeneic, antigen-extracted, autolyzed fibula allograft and 50 mg of partially purified human bone morphogenetic protein and noncollagenous proteins. The average duration of clinical followup of the patients was 53 months (range, 26-94 months). The osteonecrotic involvement of the hip was classified by plain radiographs using a modification of the Ficat staging system and MRI evaluations. Fifteen hips were classified as Ficat Stage IIA, one hip (one patient) was classified as Ficat Stage IIB, and one hip (one patient) was classified as Ficat Stage III. Fourteen hips had involvement of 50% or less of the femoral head and 2/3 or less involvement of the weight-bearing surface of the femoral head, based on a magnetic resonance imaging evaluation. The procedures were a clinical success in 14 of 15 hips (93%; 13 patients) with Stage IIA disease. Three of 17 hips (three patients) had radiographic progression (Ficat Stages IIA, IIB, and III) of the femoral head and were converted to total hip replacements. Only one of seven hips (six patients) with 50% or less involvement of the femoral head and between 1/3 and 2/3 of the weightbearing surface of the femoral head developed radiographic progression of the femoral head. There was no radiographic progression in the 3 hips with less than 1/3 involvement of the weightbearing surface of the femoral head. Further evaluation of the potential efficacy of bone morphogenetic protein is required in randomized trials.     

男性骨密度测量中不同部位骨质疏松检出率差异的比较

目的探讨中国男性腰椎与左右侧股骨不同部位骨质疏松检出率的差异。方法选取246例50~65岁健康男性,双能X线吸收法测量其腰椎、左右两侧股骨(包括股骨颈、粗隆、全髋)的骨密度,根据不同部位的T值得出相应的骨质疏松检出率,比较分析各部位检出率的差异。结果不同部位骨质疏松检出率分别为腰椎16.3%、左侧股骨颈32.1%、右侧股骨颈30.9%、左侧粗隆13.4%、右侧粗隆16.7%、左侧全髋16.7%、右侧全髋15.0%,约30%的男性股骨存在左右侧相差0.5个T值以上。综合选取上述最低T值得出的检出率为41.1%,明显高于选取单一部位T值得出的骨质疏松检出率(P=0.000)。结论综合选取多部位中最低的T值作为判断标准,能够提高中国男性骨质疏松的检出率,减少漏诊率。     

MRI对坏死股骨头关节软骨的评估

目的研究坏死股骨头关节软骨的MRI表现,以期用MRI表现反映关节软骨的受损程度。方法收集12例股骨头坏死（14髋）的股骨头直视观和对应的MRI表现及相应的X线片表现资料,比较三者在关节软骨的受累情况、软骨下分离及软骨下骨与骨分离的表现。结果相片中所有软骨均有受累,对应MRI中有11髋X线片没有表现。相片中有7髋表现为软骨下分离,对应MRI中有6髋、X线片为4髋。相片中有8髋表现为软骨下骨与骨分离,对应MRI中有8髋、X线片为3髋。结论虽然在软骨下骨与骨分离上有假阳性表现,MRI明显优于X线片,能更好反映关节软骨情况。但是对MRI的表现如何指导临床治疗还需进一步研究。