It may be normal that the little finger can be folded into a square, or it may be caused by tendon injury, bone injury and other reasons. If necessary, it is recommended to see a doctor clearly and treat according to the doctor's advice. The little finger of normal people can flex freely under the coordination of nerves, muscles and bones, and the length of the three phalanges of the little finger is not much different. When the little finger bends, it may form a square-like structure.

It's generally normal, so don't worry too much. If the tendon is damaged or broken due to trauma, it may cause the little finger to bend into a square, and generally there will be pain. Fixation and tendon transfer can be performed according to the doctor's advice.

Bone injury: if the little finger is hit by external force, it may cause fractures and other injuries. At this time, there will be symptoms such as limited activity, deformity and pain, and it may also cause the little finger to bend into a square. At this time, it is necessary to seek medical examination in time, and plaster fixation and internal fixation can be performed with the help of doctors.

Muscle tendon injury, muscle fracture caused by external force is called muscle fracture, and tendon fracture is called tendon fracture. Long-term repeated minor injuries or wear lead to long-term rupture of tendon, which is called spontaneous rupture of tendon. Chronic muscle strain is muscle imbalance caused by acute muscle fatigue or improper treatment, as well as bad posture and deformity.

Detailed description of tendon:

Muscle and tendon injuries commonly include neck muscle sprain, acute lumbar muscle sprain, chronic lumbar muscle strain, supraspinatus tendon rupture, biceps brachii tendon rupture, quadriceps femoris tendon rupture and achilles tendon rupture. The general symptoms are local pain, swelling and tenderness, and the function is weakened or lost. Treatment depends on the injury. Generally speaking, the injury needs rest, physical therapy, application of drugs to relieve pain, relax muscles and promote blood circulation, and functional exercise.

Part of the fracture was mainly treated by non-surgical treatment, and the injured limb was fixed in the muscle relaxation position for 3 weeks. Complete rupture should be sutured and fixed early for 4 ~ 6 weeks, and then physical therapy, active and passive exercise should be carried out to restore muscle strength and joint function. Acute lumbar muscle sprain. It is common that the lower back fascia is caused by sudden waist twisting or load bearing.