母指 MP関節靭帯損傷
masuiMP joint ligament injury, thumb pain
母指MP関節が腫れて、物を握ると痛みを感じる。力を入れると親指が逃げて安定感がない。疼痛が続いていて、不安があるとのことで来院されました。母指の関節には、両側に側副靭帯があり、関節の安定性を保っています。母指のMP関節側副靭帯は、物を持ったり、つまんだり、物を押したり、瓶の蓋を開けるなど、他の4指と対向して力を入れる時など、母指の関節・支持組織は重要です。そのため損傷すると、母指MP関節に、疼痛と不安定さがでます。母指MP関節は、母指の付け根と手首の間にある関節で、母指の動きを担っています。指を曲げる、指を伸ばす、指を開く、指を閉じる、指を回すなど、大きな動きをするため、荷重がかかりやすい関節です。母指の関節の使い過ぎや、加齢変性に伴い、関節を支持している靭帯が緩んできて、そのため亜脱臼したりすることもあります。靭帯のゆるみや損傷のみならず、関節の中にある関節軟骨の摩耗するケースもあります。母指は伸ばすや、曲げる、閉じる、開くだけでの作用ではありません。母指に力を入れる動作、つまむ・つかむ・握るなどの動作もあります。この状態で放置して使い続けると、指に力を入れた際に、拇指のＭＰ関節が亜脱臼して骨が出っ張ってきます。その形は、スワンネックとも呼ばれ、MP関節・指の付け根の関節が反って、IP関節・指の先端の関節が曲がってしまう、スワンネックのような形態になることもあります。進行期を過ぎると自然に疼痛が消失しますが、脱臼癖になることもあります。母指MP関節の動きを制限するプロテクターも売られています。鍼灸治療では、痛んだ靭帯や筋に、血行を促進して栄養を与えて、炎症を鎮めて疼痛緩和させ、靭帯損傷の回復をはかります。
The MP joint of the thumb is swollen and painful when gripping things. When she exerts force, the thumb escapes and does not feel stable. The patient came to our clinic with persistent pain and anxiety. The joint of the thumb has bilateral collateral ligaments that maintain joint stability. The MP joint collateral ligaments of the thumb are important for the joint and supporting tissues of the thumb when exerting force opposite the other four fingers, such as when holding, pinching, pushing objects, or opening the lid of a bottle. Therefore, when damaged, the MP joint of the thumb causes pain and instability. The MP joint is located between the base of the thumb and the wrist and is responsible for the movement of the thumb. It is a load-bearing joint because of large movements such as bending the finger, extending the finger, opening the finger, closing the finger, and rotating the finger. With overuse and age-related degeneration of the thumb joint, the ligaments that support the joint can become loose and thus subluxated. In some cases, not only are the ligaments loosened or damaged, but also the articular cartilage within the joint is worn away. The thumb does not act only in extending, bending, closing, or opening. There are also movements that force the thumb, such as pinching, grasping, and gripping. If left in this condition and used continuously, the MP joint of the thumb will subluxate and the bone will protrude when the finger is strained. The shape is also called "swan neck," in which the MP joint/joint at the base of the finger bows and the IP joint/joint at the tip of the finger bends, sometimes resulting in a swan-neck-like form. After the advanced stage, the pain spontaneously disappears, but it can become a habitual dislocation. Protectors that limit the movement of the thumb MP joint are also sold. Acupuncture treatment is used to stimulate blood circulation and nourish the painful ligaments and muscles, relieve inflammation, alleviate pain, and restore ligament damage.
