前交叉韧带断裂时,Lachman 试验为什么比前抽屉试验更敏感?
Why is the Lachman test more sensitive than the anterior drawer test for detecting an anterior cruciate ligament tear?
前抽屉试验要求膝关节屈曲90度,此时腘绳肌张力、半月板后角和后关节囊会对抗胫骨前移,可能掩盖松弛。Lachman 试验在屈曲20-30度下进行,周围结构的约束作用最小,患者肌肉也更容易放松,因此急性肿胀的膝关节同样能引出阳性。荟萃分析显示其敏感度约85%,明显高于前抽屉试验的约55%。
The anterior drawer test is performed at 90 degrees of knee flexion, where hamstring tone, the posterior horn of the meniscus, and the posterior capsule resist anterior tibial translation and can mask laxity. The Lachman test is done at 20-30 degrees of flexion, where those restraints act least and the patient relaxes more easily, so it stays positive even in an acutely swollen knee. Meta-analyses report sensitivity around 85% for the Lachman test versus roughly 55% for the anterior drawer.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Harrison's Principles of Internal Medicine 第20版,McGraw-Hill,2018
J. Loscalzo et al., Harrison's Principles of Internal Medicine, 20th ed., McGraw-Hill, 2018
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY ISBN 标识 9781259644047（按标识回读: Harrison's prin
#膝关节韧带损伤 #临床查体
为什么补钙还要补充维生素D？
Why take vitamin D along with calcium?
维生素D促进肠道吸收钙，缺乏时补钙效率偏低；二者配合并加上负重运动，才更利于骨骼健康。
Vitamin D boosts calcium absorption in the gut; without it, supplementation is less effective. Pair both with weight-bearing exercise for stronger bones.
难度 进阶 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
美国医学研究所（IOM）《钙与维生素D膳食参考摄入量》（2011）
Institute of Medicine (IOM) Dietary Reference Intakes for Calcium and Vitamin D (2011)
#钙 #维生素D #骨骼
为什么长期卧床会让骨头变脆？
Why does long bed rest make bones brittle?
骨骼遵循“用进废退”，机械负荷刺激成骨细胞；缺乏负重活动会让破骨相对活跃，骨量流失加快，称为废用性骨质疏松。
Bone follows 'use it or lose it': mechanical load stimulates bone-building cells. Without weight-bearing activity, bone-breakdown wins, causing disuse osteoporosis.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
Guyton 与 Hall《医学生理学》（Textbook of Medical Physiology）骨重建章节
Guyton and Hall, Textbook of Medical Physiology (bone remodeling chapter)
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-323-59712-8 · 核验依据 2 ISBN 978-1-4557-4377-3 (3rd ed., Elsevier) · 核验依据 3 ISBN 978-1-319-45541-5 (8th ed., Macmillan Learning)
#骨质疏松 #卧床 #负重
类风湿性关节炎和骨关节炎有什么本质不同？
What is the key difference between rheumatoid and osteoarthritis?
前者是自身免疫攻击关节滑膜，多呈对称性小关节发炎；后者主要是软骨随年龄或劳损的退行性磨损。二者治疗方向也不同。
Rheumatoid arthritis is autoimmunity attacking the joint lining (often symmetric small joints); osteoarthritis is degenerative cartilage wear from age or load. Their treatments differ too.
难度 进阶 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
Kumar 等《Robbins 病理学基础》（Robbins Pathologic Basis of Disease）关节疾病章节
Kumar et al., Robbins Pathologic Basis of Disease (joint diseases chapter)
#关节炎 #自身免疫 #软骨
为什么运动能保护关节？
How does exercise protect joints?
适度运动增强关节周围肌肉，分担关节压力并促进循环；但过度或不当动作反而会磨损软骨。
Moderate exercise strengthens muscles around joints, sharing the load and boosting circulation; overdoing it or bad form can instead wear cartilage.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Harrison's Principles of Internal Medicine 第20版,McGraw-Hill,2018
J. Loscalzo et al., Harrison's Principles of Internal Medicine, 20th ed., McGraw-Hill, 2018
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY ISBN 标识 9781259644047（按标识回读: Harrison's prin
#关节 #运动 #肌肉
急性踝关节扭伤后的头几天,为什么现在更推荐保护下适度负重加冰敷加压抬高,而不是长期石膏绝对制动?
In the first days after an acute ankle sprain, why do current protocols favor protected weight bearing with ice, compression, and elevation rather than prolonged strict immobilization?
完全制动虽能缓解疼痛,却会延迟韧带愈合并带来小腿肌肉萎缩、关节僵硬和本体感觉减退。适度的早期机械应力能引导胶原纤维沿受力方向有序排列,提高愈合组织的力学质量。随机对照证据显示,功能支具配合渐进负重的患者恢复运动更快,慢性踝关节不稳的发生率也更低。
Strict immobilization eases pain but delays ligament healing and promotes calf atrophy, joint stiffness, and impaired proprioception. Controlled early mechanical stress guides collagen fibers to align along load lines, improving the mechanical quality of healed tissue. Randomized evidence shows athletes managed with functional bracing and progressive loading return to sport sooner and develop chronic ankle instability less often than those casted.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-04
来源 · Source
Vuurberg、Hoorntje、Wink 等,《Diagnosis, treatment and prevention of ankle sprains: update of an evidence-based clinical guideline》,British Journal of Sports Medicine,2018 (DOI: 10.1136/bjsports-2017-098106)
Vuurberg, Hoorntje, Wink et al., 'Diagnosis, treatment and prevention of ankle sprains: update of an evidence-based clinical guideline', British Journal of Sports Medicine, 2018, DOI: 10.1136/bjsports-2017-098106
独立核验依据 · Independent verification: 核验依据 1 Crossref DOI 10.1136/bjsports-2017-098106
#踝关节扭伤 #功能康复
骨骼除了支撑身体还有什么作用？
Besides support, what do bones do?
骨骼是钙、磷等矿物的储存库，还包裹保护骨髓并参与造血，并与肌肉协作完成运动。
Bones store minerals like calcium and phosphorus, shelter bone marrow where blood cells are made, and work with muscles for movement.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
Guyton 与 Hall《医学生理学》（Textbook of Medical Physiology）骨与钙代谢章节
Guyton and Hall, Textbook of Medical Physiology (bone & calcium metabolism chapter)
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-323-59712-8 · 核验依据 2 ISBN 978-1-4557-4377-3 (3rd ed., Elsevier) · 核验依据 3 ISBN 978-1-319-45541-5 (8th ed., Macmillan Learning)
#骨骼 #钙 #造血
为什么骨头断了要打石膏？
Why do broken bones get a cast?
石膏把断的地方轻轻固定住，让骨头在正确的位置慢慢长在一起。
A cast gently holds the break still so the bone can grow back together in the right place.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
Rockwood 与 Green《成人骨折》（Fractures in Adults，第9版）
Rockwood & Green's Fractures in Adults (9th edition)
#骨折 #石膏 #愈合