{"id":20643,"date":"2023-04-14T16:06:07","date_gmt":"2023-04-14T09:06:07","guid":{"rendered":"http:\/\/noithathoaphat.in\/ctv\/?p=20643"},"modified":"2023-05-02T15:59:15","modified_gmt":"2023-05-02T08:59:15","slug":"luc-trong-chinh-hinh-rang-mat-khai-niem-can-ban","status":"publish","type":"post","link":"http:\/\/noithathoaphat.in\/ctv\/index.php\/2023\/04\/14\/luc-trong-chinh-hinh-rang-mat-khai-niem-can-ban\/","title":{"rendered":"L\u1ef1c trong ch\u1ec9nh h\u00ecnh r\u0103ng m\u1eb7t – Kh\u00e1i ni\u1ec7m c\u0103n b\u1ea3n."},"content":{"rendered":"

B\u00e0i vi\u1ebft sau t\u1eadp trung gi\u1ea3i th\u00edch c\u00e1c kh\u00e1i ni\u1ec7m r\u1ea5t s\u01a1 l\u01b0\u1ee3c li\u00ean quan \u0111\u1ebfn l\u0129nh v\u1ef1c ch\u1ec9nh nha: L\u1ef1c th\u00f4ng th\u01b0\u1eddng, l\u1ef1c trong ch\u1ec9nh h\u00ecnh r\u0103ng- m\u1eb7t v\u00e0 c\u00e1c nguy\u00ean l\u00fd v\u1ec1 s\u1ef1 thay \u0111\u1ed5i ph\u00e1t tri\u1ec3n x\u01b0\u01a1ng. Nha s\u0129 c\u1ea7n n\u1eafm r\u00f5 c\u00e1c kh\u00e1i ni\u1ec7m, hi\u1ec3u b\u1ea3n ch\u1ea5t v\u00e0 c\u00f3 kh\u1ea3 n\u0103ng \u00e1p d\u1ee5ng v\u00e0o th\u1ef1c t\u1ebf \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 cao nh\u1ea5t.<\/strong><\/p>\n

1. Kh\u00e1i ni\u1ec7m v\u1ec1 l\u1ef1c<\/h2>\n

1.1. \u0110\u1ecbnh ngh\u0129a<\/h3>\n

– L\u1ef1c l\u00e0 m\u1ed9t s\u1ee9c k\u00e9o ho\u1eb7c \u0111\u1ea9y \u0111\u1eb7t l\u00ean m\u1ed9t v\u1eadt l\u00e0m di chuy\u1ec3n v\u1eadt \u0111\u00f3 \u0111\u1ebfn m\u1ed9t v\u1ecb tr\u00ed kh\u00e1c trong kh\u00f4ng gian. L\u1ef1c \u0111\u01b0\u1ee3c bi\u1ec3u hi\u1ec7n b\u1edfi m\u1ed9t vector v\u1ec1 h\u01b0\u1edbng, \u0111\u01b0\u1eddng ho\u1ea1t \u0111\u1ed9ng, chi\u1ec1u v\u00e0 c\u01b0\u1eddng \u0111\u1ed9.<\/p>\n

+ Chi\u1ec1u d\u00e0i c\u1ee7a vector ch\u1ec9 c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a l\u1ef1c, chi\u1ec1u c\u1ee7a m\u0169i t\u00ean ch\u1ec9 chi\u1ec1u di chuy\u1ec3n v\u00e0 \u0111\u01b0\u1eddng th\u1eb3ng c\u1ee7a chi\u1ec1u \u0111\u00f3 l\u00e0 \u0111\u01b0\u1eddng ho\u1ea1t \u0111\u1ed9ng.<\/p>\n

+ \u0110\u1eb7t v\u00e0o m\u1ed9t v\u1eadt \u0111\u1eb7c m\u1ed9t l\u1ef1c c\u00f3 c\u01b0\u1eddng \u0111\u1ed9, chi\u1ec1u, h\u01b0\u1edbng v\u00e0 \u0111\u01b0\u1eddng ho\u1ea1t \u0111\u1ed9ng kh\u00f4ng thay \u0111\u1ed5i th\u00ec s\u1ebd c\u00f3 t\u00e1c d\u1ee5ng y h\u1ec7t nhau khi \u0111\u1eb7t v\u00e0o b\u1ea5t c\u1ee9 \u0111i\u1ec3m n\u00e0o.<\/p>\n

\u0110\u01a1n v\u1ecb: Newtons (N), h\u01b0ng th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng grams hay ounces.<\/p>\n

1.2. H\u1ee3p l\u1ef1c<\/h3>\n

\u0110\u1ec3 di chuy\u1ec3n m\u1ed9t v\u1eadt, ta c\u00f3 th\u1ec3 \u0111\u1eb7t l\u00ean n\u00f3 m\u1ed9t hay nhi\u1ec1u l\u1ef1c. Khi \u0111\u00f3, c\u1ea7n ph\u1ea3i t\u00ednh h\u1ee3p l\u1ef1c \u0111\u1ec3 bi\u1ebft \u0111\u01b0\u1ee3c t\u00e1c d\u1ee5ng c\u1ee7a n\u00f3.<\/p>\n

C\u00e1c l\u1ef1c c\u00f3 th\u1ec3 l\u00e0:<\/p>\n

– Song song v\u00e0 c\u00f9ng chi\u1ec1u: R=F+f.<\/p>\n

– Song song v\u00e0 ng\u01b0\u1ee3c chi\u1ec1u: R=F\u2212f.<\/p>\n

– \u0110\u1ed3ng quy: hai l\u1ef1c \u0111\u1ed3ng quy \u0111\u01b0\u1ee3c thay th\u1ebf b\u1eb1ng m\u1ed9t h\u1ee3p l\u1ef1c. \u0110\u00f3 l\u00e0 \u0111\u01b0\u1eddng ch\u00e9o c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh \u0111\u01b0\u1ee3c t\u1ea1o b\u1edfi hai l\u1ef1c \u0111\u1ed3ng qui \u0111\u00f3. Ng\u01b0\u1ee3c l\u1ea1i, m\u1ed9t l\u1ef1c c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c thay th\u1ebf b\u1eb1ng hai l\u1ef1c m\u00e0 h\u1ee3p l\u1ef1c d\u1ef1a tr\u00ean s\u01a1 \u0111\u1ed3 \u0111\u01b0\u1eddng ch\u00e9o h\u00ecnh b\u00ecnh h\u00e0nh.<\/p>\n

1.3. Trung t\u00e2m c\u1ea3n<\/h3>\n

Trung t\u00e2m c\u1ea3n l\u00e0 \u0111i\u1ec3m c\u1ee7a m\u1ed9t v\u1eadt \u0111\u1eb7c m\u00e0 ta c\u00f3 th\u1ec3 t\u1ea1o c\u00e1c \u0111\u01b0\u1eddng ho\u1ea1t \u0111\u1ed9ng c\u1ee7a m\u1ed9t l\u1ef1c c\u00f3 c\u01b0\u1eddng \u0111\u1ed9, h\u01b0\u1edbng, \u0111i\u1ec3m \u0111\u1eb7t l\u1ef1c v\u00e0o m\u1ed9t chi\u1ec1u b\u1ea5t k\u1ef3 \u0111\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c m\u1ed9t di chuy\u1ec3n ngang v\u1eadt \u0111\u1eb7c \u0111\u00f3.<\/p>\n

Trung t\u00e2m c\u1ea3n c\u1ee7a x\u01b0\u01a1ng h\u00e0m tr\u00ean l\u00e0 v\u00f9ng \u0111\u1ec9nh c\u1ee7a ch\u00e2n r\u0103ng h\u00e0m nh\u1ecf th\u1ee9 nh\u1ea5t v\u00e0 th\u1ee9 hai h\u00e0m tr\u00ean (Theo Tanne v\u00e0 Hitoro).<\/p>\n

Theo Miki th\u00ec trung t\u00e2m c\u1ea3n n\u1eb1m gi\u1eefa r\u0103ng h\u00e0m nh\u1ecf th\u1ee9 nh\u1ea5t v\u00e0 th\u1ee9 hai theo chi\u1ec1u tr\u01b0\u1edbc sau, gi\u1eefa \u1ed5 m\u1eaft v\u00e0 ph\u00eda xa l\u1ed7 apex c\u1ee7a r\u0103ng h\u00e0m l\u1edbn th\u1ee9 nh\u1ea5t theo chi\u1ec1u d\u1ecdc. Theo Haat, trung t\u00e2m c\u1ea3n c\u1ee7a x\u01b0\u01a1ng h\u00e0m tr\u00ean l\u00e0 5mm \u1edf ph\u00eda tr\u00ean s\u00e0n m\u0169i.<\/p>\n

N\u1ebfu c\u00f3 m\u1ed9t l\u1ef1c t\u00e1c \u0111\u1ed9ng l\u00ean x\u01b0\u01a1ng h\u00e0m tr\u00ean th\u00ec x\u01b0\u01a1ng h\u00e0m kh\u00f4ng ch\u1ec9 di chuy\u1ec3n m\u00e0 c\u00f2n quay xung quanh t\u00e2m c\u1ea3n nh\u1edd m\u1ed9t moment l\u1ef1c. Kho\u1ea3ng c\u00e1ch t\u1eeb \u0111i\u1ec3m t\u00e1c \u0111\u1ed9ng l\u1ef1c t\u1edbi trung t\u00e2m c\u1ea3n g\u1ecdi l\u00e0 c\u00e1nh tay momen l\u1ef1c.<\/p>\n

1.4. L\u1ef1c trong ch\u1ec9nh h\u00ecnh r\u0103ng-m\u1eb7t<\/h3>\n

L\u1ef1c t\u1ef1 nhi\u00ean do c\u00e1c c\u01a1 c\u1ee7a h\u1ec7 th\u1ed1ng h\u00e0m m\u1eb7t t\u1ea1o n\u00ean. L\u1ef1c c\u01a1 h\u1ecdc d\u00f9ng \u0111\u1ec3 thay \u0111\u1ed5i chi\u1ec1u h\u01b0\u1edbng ph\u00e1t tri\u1ec3n c\u1ee7a x\u01b0\u01a1ng v\u00e0 r\u0103ng. L\u1ef1c trong ch\u1ec9nh h\u00ecnh r\u0103ng-m\u1eb7t t\u00e1c \u0111\u1ed9ng l\u00ean x\u01b0\u01a1ng v\u00e0 r\u0103ng th\u00f4ng qua kh\u00ed c\u1ee5 ch\u1ec9nh h\u00ecnh trong mi\u1ec7ng ho\u1eb7c ngo\u00e0i m\u1eb7t (l\u00e0 kh\u00ed c\u1ee5 t\u1ea1o n\u00ean s\u1ee9c \u00e9p v\u00e0 s\u1ee9c c\u0103ng \u0111\u1ec3 \u0111\u01b0a \u0111\u1ebfn s\u1ef1 thay \u0111\u1ed5i v\u1ecb tr\u00ed c\u1ee7a r\u0103ng ho\u1eb7c x\u01b0\u01a1ng) ph\u1ee5 thu\u1ed9c v\u00e0o nh\u1eefng y\u1ebfu t\u1ed1 sau:<\/p>\n

– Ph\u1ea3n \u1ee9ng c\u1ee7a m\u00f4 v\u00f9ng mi\u1ec7ng v\u1edbi l\u1ef1c.<\/p>\n

– L\u1ef1c c\u1ee7a kh\u1edbp c\u1eafn.<\/p>\n

– C\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a l\u1ef1c.<\/p>\n

– H\u01b0\u1edbng c\u1ee7a l\u1ef1c.<\/p>\n

– Th\u1eddi gian l\u1ef1c ho\u1ea1t \u0111\u1ed9ng.<\/p>\n

– K\u00edch th\u01b0\u1edbc v\u00e0 \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a v\u00f9ng \u0111\u1eb7t l\u1ef1c v\u00e0 v\u1ecb tr\u00ed t\u00e1c \u0111\u1ed9ng c\u1ee7a l\u1ef1c t\u1ea1i v\u00f9ng \u0111\u00f3.<\/p>\n

1.5. Th\u1eddi h\u1ea1n t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c trong ch\u1ec9nh h\u00ecnh<\/h3>\n

Th\u1eddi gian duy tr\u00ec l\u1ef1c ch\u1ec9nh h\u00ecnh r\u0103ng m\u1eb7t \u0111\u01b0\u1ee3c ph\u00e2n lo\u1ea1i theo y\u1ebfu t\u1ed1 suy gi\u1ea3m l\u1ef1c.<\/p>\n

– L\u1ef1c li\u00ean t\u1ee5c: c\u01b0\u1eddng \u0111\u1ed9 l\u1ef1c v\u1eabn c\u00f2n \u0111\u01b0\u1ee3c duy tr\u00ec (m\u1eb7c d\u00f9 r\u1ea5t nh\u1ecf) gi\u1eefa c\u00e1c l\u1ea7n t\u0103ng l\u1ef1c.<\/p>\n

\"luc-trong-chinh-nha-1\"
\u0110\u1ed3 th\u1ecb l\u1ef1c li\u00ean t\u1ee5c<\/figcaption><\/figure>\n

– L\u1ef1c gi\u00e1n \u0111o\u1ea1n: C\u01b0\u1eddng \u0111\u1ed9 l\u1ef1c gi\u1ea3m \u0111\u1ebfn kh\u00f4ng gi\u1eefa m\u1ed7i l\u1ea7n t\u0103ng l\u1ef1c<\/span><\/p>\n

C\u1ea3 hai lo\u1ea1i l\u1ef1c li\u00ean t\u1ee5c v\u00e0 gi\u00e1n \u0111o\u1ea1n \u0111\u1ec1u \u0111\u1ec1u \u0111\u01b0\u1ee3c t\u1ea1o b\u1edfi kh\u00ed c\u1ee5 ch\u1ec9nh h\u00ecnh c\u1ed1 \u0111\u1ecbnh.<\/p>\n

– L\u1ef1c ng\u1eaft qu\u00e3ng: c\u01b0\u1eddng \u0111\u1ed9 l\u1ef1c gi\u1ea3m \u0111\u1ed9t ng\u1ed9t \u0111\u1ebfn kh\u00f4ng khi kh\u00ed c\u1ee5 ch\u1ec9nh h\u00ecnh r\u0103ng m\u1eb7t \u0111\u01b0\u1ee3c th\u00e1o ra sau \u0111\u00f3 c\u01b0\u1eddng \u0111\u1ed9 l\u1ef1c tr\u1edf l\u1ea1i m\u1ee9c \u0111\u1ed9 ban \u0111\u1ea7u khi kh\u00ed c\u1ee5 \u0111\u01b0\u1ee3c mang tr\u1edf l\u1ea1i mi\u1ec7ng. L\u1ef1c ng\u1eaft qu\u00e3ng c\u00f3 \u1edf c\u00e1c kh\u00ed c\u1ee5 do b\u1ec7nh nh\u00e2n t\u1ef1 mang nh\u01b0 h\u00e0m th\u00e1o l\u1eafp, Headgear, Face mask, chun k\u00e9o.<\/p>\n

\"luc-trong-chinh-nha-4\"
Bi\u1ec3u \u0111\u1ed3 l\u1ef1c ng\u1eaft qu\u00e3ng<\/figcaption><\/figure>\n

2. C\u00e1c nguy\u00ean l\u00fd trong s\u1ef1 thay \u0111\u1ed5i t\u1ed1c \u0111\u1ed9 ph\u00e1t tri\u1ec3n c\u1ee7a x\u01b0\u01a1ng<\/h2>\n

2.1. Nguy\u00ean l\u00fd chung v\u1ec1 l\u1ef1c trong ch\u1ec9nh h\u00ecnh<\/h3>\n

Khi d\u00f9ng m\u1ed9t l\u1ef1c t\u00e1c \u0111\u1ed9ng l\u00ean x\u01b0\u01a1ng h\u00e0m s\u1ebd l\u00e0m thay \u0111\u1ed5i t\u1ed1c \u0111\u1ed9 v\u00e0 h\u01b0\u1edbng ph\u00e1t tri\u1ec3n c\u1ee7a x\u01b0\u01a1ng.<\/p>\n

L\u1ef1c trong ch\u1ec9nh h\u00ecnh r\u0103ng m\u1eb7t \u00e1p d\u1ee5ng l\u00ean r\u0103ng c\u00f3 kh\u1ea3 n\u0103ng ph\u00e1t t\u00e1n ra ngo\u00e0i v\u00e0 t\u00e1c \u0111\u1ed9ng \u0111\u1ebfn v\u1ecb tr\u00ed xa c\u1ee7a x\u01b0\u01a1ng, n\u00f3 c\u00f3 th\u1ec3 l\u00e0m thay \u0111\u1ed5i ki\u1ec3u ph\u00e1t tri\u1ec3n c\u1ee7a h\u00e0m.<\/p>\n

H\u00e0m tr\u00ean ph\u00e1t tri\u1ec3n b\u1eb1ng c\u00e1ch:<\/p>\n

– Ch\u1ed3ng l\u00ean x\u01b0\u01a1ng m\u1edbi t\u1ea1i \u0111\u01b0\u1eddng r\u00e1p kh\u1edbp tr\u01b0\u1edbc v\u00e0 sau ch\u00fang.<\/p>\n

– \u0110\u1ea9y ra tr\u01b0\u1edbc nh\u1edd k\u00e9o d\u00e0i n\u1ec1n s\u1ecd.<\/p>\n

– Di chuy\u1ec3n xu\u1ed1ng d\u01b0\u1edbi, ra ph\u00eda tr\u01b0\u1edbc nh\u1edd v\u00e0o s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a c\u00e1c m\u00f4 m\u1ec1m k\u1ec1 s\u00e1t.<\/p>\n

S\u1ef1 c\u0103ng t\u1ea1i c\u00e1c \u0111\u01b0\u1eddng r\u00e1p kh\u1edbp khi h\u00e0m tr\u00ean thay \u0111\u1ed5i kh\u1ecfi c\u00e1c c\u1ea5u tr\u00fac \u0111\u1ee1 c\u1ee7a ch\u00fang \u0111\u00e3 k\u00edch th\u00edch cho s\u1ef1 h\u00ecnh th\u00e0nh x\u01b0\u01a1ng m\u1edbi.<\/p>\n

H\u00e0m d\u01b0\u1edbi \u0111\u01b0\u1ee3c k\u00e9o xu\u1ed1ng d\u01b0\u1edbi v\u00e0 ra tr\u01b0\u1edbc nh\u1edd c\u00e1c m\u00f4 m\u1ec1m xung quanh. Khi ph\u1ea3n \u1ee9ng, m\u1ecfm x\u01b0\u01a1ng l\u1ed3i c\u1ea7u ph\u00e1t tri\u1ec3n l\u00ean tr\u00ean v\u00e0 v\u1ec1 ph\u00eda sau \u0111\u1ec3 duy tr\u00ec kh\u1edbp th\u00e1i d\u01b0\u01a1ng h\u00e0m.<\/p>\n

Nh\u01b0 v\u1eady, khi c\u00f3 m\u1ed9t l\u1ef1c ch\u1ed1ng l\u1ea1i s\u1ef1 d\u1ecbch chuy\u1ec3n xu\u1ed1ng d\u01b0\u1edbi v\u00e0 v\u1ec1 ph\u00eda tr\u01b0\u1edbc c\u1ee7a m\u1ed9t trong hai h\u00e0m s\u1ebd l\u00e0m gi\u1ea3m m\u1ee9c ph\u00e1t tri\u1ec3n v\u00e0 ng\u01b0\u1ee3c l\u1ea1i, khi t\u0103ng th\u00eam l\u1ef1c k\u00e9o th\u00ec s\u1ebd l\u00e0m t\u0103ng s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a ch\u00fang.<\/p>\n

2.2. \u1ea2nh h\u01b0\u1edfng c\u1ee7a l\u1ef1c ch\u1ec9nh h\u00ecnh t\u1edbi h\u00e0m tr\u00ean v\u00e0 t\u1ea7ng gi\u1eefa m\u1eb7t<\/h3>\n

C\u00e1c v\u1ecb tr\u00ed quan tr\u1ecdng c\u1ee7a s\u1ef1 ph\u00e1t tri\u1ec3n h\u00e0m tr\u00ean, ch\u1ed7 c\u00f3 th\u1ec3 th\u1ea5y s\u1ef1 thay \u0111\u1ed5i t\u1ed1c \u0111\u1ed9 ph\u00e1t tri\u1ec3n l\u00e0 c\u00e1c \u0111\u01b0\u1eddng r\u00e1p kh\u1edbp g\u1eafn h\u00e0m tr\u00ean v\u1edbi:<\/p>\n

– X\u01b0\u01a1ng g\u00f2 m\u00e1.<\/p>\n

– X\u01b0\u01a1ng kh\u1ea9u c\u00e1i.<\/p>\n

– X\u01b0\u01a1ng b\u01b0\u1edbm v\u00e0 khu v\u1ef1c ch\u00ednh m\u0169i c\u0169ng nh\u01b0 \u0111\u01b0\u1eddng kh\u1edbp gi\u1eefa v\u00f2m mi\u1ec7ng.<\/p>\n

Khi x\u01b0\u01a1ng h\u00e0m tr\u00ean k\u00e9m ph\u00e1t tri\u1ec3n, t\u00e1c \u0111\u1ed9ng th\u00eam m\u1ed9t l\u1ef1c t\u1ef1 nhi\u00ean l\u00e0m t\u00e1ch \u0111\u01b0\u1eddng r\u00e1p kh\u1edbp nhi\u1ec1u h\u01a1n s\u1ebd l\u00e0m t\u0103ng s\u1ef1 ph\u00e1t tri\u1ec3n. Theo kinh nghi\u1ec7m y h\u1ecdc th\u00ec ch\u1ec9 c\u1ea7n s\u1eed d\u1ee5ng m\u1ed9t l\u1ef1c v\u1eeba ph\u1ea3i t\u00e1c \u0111\u1ed9ng v\u00e0o x\u01b0\u01a1ng \u0111\u1ec3 ng\u0103n c\u1ea3n s\u1ef1 ph\u00e1t tri\u1ec3n v\u1ec1 ph\u00eda tr\u01b0\u1edbc c\u1ee7a h\u00e0m tr\u00ean (l\u1ef1c d\u00f9ng \u0111\u1ec3 ki\u1ec1m ch\u1ebf s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a h\u00e0m tr\u00ean l\u00e0 kho\u1ea3ng 500gr t\u1ee9c l\u00e0 250g cho m\u1ed7i b\u00ean cung h\u00e0m v\u00e0 t\u00e1c d\u1ee5ng l\u1ef1c th\u00f4ng qua r\u0103ng h\u00e0m l\u1edbn th\u1ee9 nh\u1ea5t) nh\u01b0ng ph\u1ea3i c\u1ea7n m\u1ed9t l\u1ef1c l\u1edbn h\u01a1n \u0111\u1ec3 t\u00e1ch \u0111\u01b0\u1eddng r\u00e1p kh\u1edbp v\u00e0 k\u00edch th\u00edch s\u1ef1 ph\u00e1t tri\u1ec3n (kho\u1ea3ng 1000gr \u0111\u1ec3 \u0111\u01b0a h\u00e0m tr\u00ean ra tr\u01b0\u1edbc v\u00e0 l\u1ef1c \u0111\u01b0\u1ee3c ph\u00e2n b\u1ed1 h\u1ea7u h\u1ebft tr\u00ean c\u00e1c r\u0103ng h\u00e0m).<\/p>\n

S\u1eed d\u1ee5ng l\u1ef1c n\u1eb7ng, li\u00ean t\u1ee5c g\u00e2y ph\u00e1 ho\u1ea1i ch\u00e2n r\u0103ng v\u00e0 l\u1ee3i. V\u00ec v\u1eady, n\u00ean d\u00f9ng l\u1ef1c n\u1eb7ng nh\u01b0ng ng\u1eaft qu\u00e3ng s\u1ebd \u00edt \u1ea3nh h\u01b0\u1edfng c\u00f3 h\u1ea1i \u0111\u1ebfn l\u1ee3i v\u00e0 ch\u00e2n r\u0103ng h\u01a1n, \u0111\u1ed3ng th\u1eddi \u00edt g\u00e2y n\u00ean hi\u1ec7n t\u01b0\u1ee3ng chuy\u1ec3n d\u1ecbch r\u0103ng.<\/p>\n

M\u1eb7t kh\u00e1c, m\u1ee9c \u0111\u1ed9 g\u00e0i v\u00e0o nhau c\u1ee7a c\u00e1c gai x\u01b0\u01a1ng ngang qua c\u00e1c \u0111\u01b0\u1eddng r\u00e1p kh\u1edbp c\u0169ng \u1ea3nh h\u01b0\u1edfng l\u1edbn t\u1edbi qu\u00e1 tr\u00ecnh \u0111i\u1ec1u tr\u1ecb. Khi c\u00f2n nh\u1ecf, c\u00f3 \u00edt ho\u1eb7c kh\u00f4ng c\u00f3 hi\u1ec7n t\u01b0\u1ee3ng c\u00e0i r\u0103ng l\u01b0\u1ee3c. Vi\u1ec7c t\u00e1ch c\u00e1c m\u00e0ng x\u01b0\u01a1ng t\u1ea1i c\u00e1c \u0111\u01b0\u1eddng r\u00e1p kh\u1edbp c\u1ee7a ch\u00fang t\u01b0\u01a1ng \u0111\u1ed1i d\u1ec5 d\u00e0ng.<\/p>\n

\"luc-trong-chinh-nha-5\"
H\u00ecnh \u1ea3nh m\u00f4 h\u1ecdc c\u1ee7a \u0111\u01b0\u1eddng r\u00e1p kh\u1edbp gi\u1eefa kh\u1ea9u c\u00e1i<\/figcaption><\/figure>\n

S\u01a1 \u0111\u1ed3 n\u00e0y cho th\u1ea5y h\u00ecnh \u1ea3nh m\u00f4 h\u1ecdc c\u1ee7a \u0111\u01b0\u1eddng r\u00e1p kh\u1edbp gi\u1eefa v\u00f2m mi\u1ec7ng \u1edf (A) l\u00fac b\u00e9: khi \u0111\u01b0\u1eddng r\u00e1p kh\u1edbp g\u1ea7n nh\u01b0 l\u00e0 \u0111\u01b0\u1eddng th\u1eb3ng; (B): m\u1edbi l\u1edbn; (C): \u0111\u00e3 l\u1edbn. C\u00e1c v\u00f9ng nh\u1ecf c\u1ee7a x\u01b0\u01a1ng b\u1eaft ngang qua \u0111\u01b0\u1eddng r\u00e1p kh\u1edbp ph\u00e1t tri\u1ec3n (sau 17 tu\u1ed5i) s\u1ef1 m\u1edf r\u1ed9ng c\u1ee7a x\u01b0\u01a1ng h\u00e0m l\u00e0 r\u1ea5t kh\u00f3.<\/em><\/p>\n

Gi\u1ed1ng nh\u01b0 c\u00e1c \u0111\u01b0\u1eddng r\u00e1p kh\u1edbp c\u1ee7a x\u01b0\u01a1ng m\u1eb7t, \u0111\u01b0\u1eddng r\u00e1p kh\u1edbp gi\u1eefa v\u00f2m mi\u1ec7ng ng\u00e0y c\u00e0ng quanh co v\u00e0 c\u00e0i v\u00e0o nhau c\u00e0ng nhi\u1ec1u khi tu\u1ed5i c\u00e0ng l\u1edbn.<\/p>\n

Trong giai \u0111o\u1ea1n \u0111\u01b0\u1eddng kh\u1edbp gi\u1eefa kh\u1ea9u c\u00e1i ch\u01b0a li\u1ec1n x\u01b0\u01a1ng, c\u00f3 th\u1ec3 t\u1ea1o \u0111\u01b0\u1ee3c t\u00e1c \u0111\u1ed9ng t\u00e1ch \u0111\u01b0\u1eddng r\u00e1p kh\u1edbp n\u1ebfu c\u00f3 thi\u1ebft k\u1ebf h\u1ee3p l\u00fd v\u00e0 l\u1ef1c c\u00f3 \u0111\u1ee7 \u0111\u1ed9 l\u1edbn. S\u1ef1 c\u00e0i kh\u1edbp t\u0103ng d\u1ea7n khi\u1ebfn vi\u1ec7c t\u00e1ch kh\u1edbp tr\u1edf n\u00ean kh\u00f3 kh\u0103n, \u0111\u1eb7c bi\u1ec7t l\u00e0 sau tu\u1ed5i d\u1eady th\u00ec. \u0110\u1ed9 tu\u1ed5i th\u00edch h\u1ee3p cho \u0111i\u1ec1u tr\u1ecb nong h\u00e0m l\u00e0 kho\u1ea3ng 6 – 15 tu\u1ed5i v\u00e0 c\u00f3 sai l\u1ec7ch theo gi\u1edbi v\u00e0 tu\u1ed5i d\u1eady th\u00ec c\u1ee7a t\u1eebng tr\u1ebb.<\/p>\n

Khi c\u00e1c v\u00f9ng nh\u1ecf c\u1ee7a x\u01b0\u01a1ng b\u1eafc qua \u0111\u01b0\u1eddng r\u00e1p kh\u1edbp ph\u00e1t tri\u1ec3n (sau 16 tu\u1ed5i) s\u1ef1 m\u1edf r\u1ed9ng x\u01b0\u01a1ng h\u00e0m l\u00e0 kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c.<\/p>\n

Nh\u01b0 v\u1eady, mu\u1ed1n k\u00e9o d\u00e0i to\u00e0n b\u1ed9 h\u00e0m tr\u00ean v\u1ec1 ph\u00eda tr\u01b0\u1edbc ho\u1eb7c nong r\u1ed9ng h\u00e0m sang b\u00ean ch\u1ec9 th\u1ef1c hi\u1ec7n \u0111\u01b0\u1ee3c khi tr\u1ebb nh\u1ecf, khi m\u00e0 c\u00e1c \u0111\u01b0\u1eddng r\u00e1p kh\u1edbp c\u00f2n ch\u01b0a c\u00e0i v\u00e0o nhau nhi\u1ec1u.<\/p>\n

3. Neo ch\u1eb7n l\u1ef1c trong ch\u1ec9nh nha<\/h2>\n

Theo William: v\u00f9ng neo ch\u1eb7n l\u00e0 v\u00f9ng \u0111\u1ec3 ch\u1ed1ng l\u1ea1i nh\u1eefng di chuy\u1ec3n kh\u00f4ng mong mu\u1ed1n.Trong \u0111\u00f3, neo ch\u1eb7n t\u1ef1 nhi\u00ean l\u00e0 l\u1ef1c c\u1ee7a m\u1ed7i r\u0103ng b\u00ecnh th\u01b0\u1eddng trong m\u1ed9t m\u00f4i tr\u01b0\u1eddng l\u00e0nh m\u1ea1nh ch\u1ed1ng l\u1ea1i l\u1ef1c mu\u1ed1n \u0111\u1ea9y n\u00f3.<\/p>\n

\"luc-trong-chinh-nha-6\"
H\u1ec7 s\u1ed1 neo ch\u1eb7n tr\u00ean r\u0103ng<\/figcaption><\/figure>\n

M\u1ed9t trong nh\u1eefng y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn r\u0103ng b\u1ecb di chuy\u1ec3n l\u00e0 b\u1ec1 m\u1eb7t ch\u00e2n r\u0103ng. Theo Freeman th\u00ec di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t ch\u00e2n r\u0103ng c\u00e0ng r\u1ed9ng th\u00ec l\u1ef1c ch\u1ed1ng l\u1ea1i s\u1ef1 di chuy\u1ec3n c\u1ee7a r\u0103ng \u0111\u00f3 c\u00e0ng l\u1edbn. V\u00f9ng neo ch\u1eb7n s\u1ebd \u0111\u01b0\u1ee3c t\u0103ng c\u01b0\u1eddng h\u01a1n n\u1ebfu ta li\u00ean k\u1ebft c\u1ea3 m\u1ed9t nh\u00f3m r\u0103ng.<\/span><\/p>\n

Theo: S\u00e1ch \u0110i\u1ec1u tr\u1ecb k\u00e9m ph\u00e1t tri\u1ec3n chi\u1ec1u ngang v\u00e0 chi\u1ec1u tr\u01b0\u1edbc sau x\u01b0\u01a1ng h\u00e0m tr\u00ean – NXB Y h\u1ecdc<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

B\u00e0i vi\u1ebft sau t\u1eadp trung gi\u1ea3i th\u00edch c\u00e1c kh\u00e1i ni\u1ec7m r\u1ea5t s\u01a1 l\u01b0\u1ee3c li\u00ean quan \u0111\u1ebfn l\u0129nh v\u1ef1c ch\u1ec9nh nha: L\u1ef1c th\u00f4ng th\u01b0\u1eddng, l\u1ef1c trong ch\u1ec9nh h\u00ecnh r\u0103ng- m\u1eb7t v\u00e0 c\u00e1c nguy\u00ean l\u00fd v\u1ec1 s\u1ef1 thay \u0111\u1ed5i ph\u00e1t tri\u1ec3n x\u01b0\u01a1ng. Nha s\u0129 c\u1ea7n n\u1eafm r\u00f5 c\u00e1c kh\u00e1i ni\u1ec7m, hi\u1ec3u b\u1ea3n ch\u1ea5t v\u00e0 c\u00f3 kh\u1ea3 n\u0103ng […]<\/p>\n","protected":false},"author":21,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[28,33],"tags":[3],"yoast_head":"\nL\u1ef1c trong ch\u1ec9nh h\u00ecnh r\u0103ng m\u1eb7t - Kh\u00e1i ni\u1ec7m c\u0103n b\u1ea3n. - Vinmec<\/title>\n<meta name=\"description\" content=\"B\u00e0i vi\u1ebft gi\u1ea3i th\u00edch kh\u00e1i ni\u1ec7m: L\u1ef1c th\u00f4ng th\u01b0\u1eddng, l\u1ef1c trong ch\u1ec9nh h\u00ecnh r\u0103ng- m\u1eb7t v\u00e0 nguy\u00ean l\u00fd v\u1ec1 s\u1ef1 thay \u0111\u1ed5i ph\u00e1t tri\u1ec3n x\u01b0\u01a1ng. 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