The invention is a half pin for use in conjunction with external fixators, in which the half pin has a thin hydroxyapatite coating over a substantial portion thereof, a not-sharp hole-finding tip, and a variable pitch pattern in the threaded portion of the half pin. The hydroxyapatite coating must be thin—40-70 microns, deposited by plasma spray—and with limited porosity and pore size, and must extend not only over all the threads of the half pin but also a substantial portion of the unthreaded shaft proximal to the threaded end. The invention also includes a pin cube for use in association with the coated half pins. Wires may also be coated with the hydroxyapatite coating.

Female polyaxial joints for connecting a strut to a support frame of an external fixation device are described having a ball socket and a ball member. The ball member includes a spherical portion and a ball member shaft extending from the spherical portion. At least one aperture is positioned on the ball member and traverses through at least a portion of the ball member shaft. An internal surface of the ball member shaft may be threaded and configured to receive a threaded connector.

An automatic traction device for a lower limb fracture osteosynthesis includes a chassis structure, a lower leg supporting structure and an upper leg supporting structure connected two by two. The automatic traction device further includes a tibia distal position adjusting device, for adjusting a position and an angle of a distal end of a tibia, on the lower leg supporting structure and close to the first end portion of the lower leg supporting structure; and a tibia proximal position adjusting device, for adjusting a position and an angle of a proximal end of a tibia, on the lower leg supporting structure and close to the second end portion of the lower leg supporting structure.

An external bone fixation system may include a first semi-circular external fixation member, a second semi-circular external fixation member, four ball collet assemblies attached to the second external fixation member, and four shafts. Each shaft may include a first end attached to the first external fixation member and a second end with a stop member, and each of the four shafts extends slidably through an opening in a ball of one of the four ball collet assemblies. The stop member of each second end prevents each second end from passing through the opening in its respective ball. Each shaft also includes a hinge located closer to the first end than to the second end.

An strut assembly extends along a strut axis and comprises a strut body, an actuator, and a locking assembly. The strut body includes a rod and a sleeve. The rod is translatable relative to the sleeve along the strut axis. The actuator is linearly engaged with the sleeve such that linear movement of the actuator causes linear movement of the sleeve. The locking assembly includes a lock member configured to transition between a locked position in which the lock member engages both the sleeve and the actuator such that rotation between the sleeve and the actuator is substantially prevented, and an unlocked position in which the lock member is spaced apart from the sleeve such that the actuator is substantially free to rotate about the sleeve.

A fracture reduction method and a parallel external fixator for fracture reduction for realizing the method, the fracture reduction method being used for existing six-chain ring-shaped parallel external fixators in minimally invasive fracture reduction or osteotomy of limbs. The parallel external fixator comprises two fixation rings, six struts and six markers, the fixation rings are arranged with a plurality of connecting holes, the struts are arranged with a spherical hinge, a driving joint (1302), a quick-mounting component and a universal hinge, the markers comprise marker balls and a pin shaft. The parallel external fixator can improve the treatment accuracy, reliability and operation convenience.

An apparatus and method for external anteversion correction of an intact bone may include a first arcuate segment, a second arcuate segment rotatably coupled to the first arcuate segment, a first pin extending from the first arcuate segment to a proximal segment of the intact bone, a second pin extending from the second arcuate segment to a distal segment of the intact bone, and a control mechanism attached to the first and second arcuate segments. The control mechanism may rotate the first arcuate segment relative to the second arcuate segment to exert torsional force on the intact bone between the proximal and distal segments of the intact bone, thereby externally reducing anteversion of the intact bone.

The invention is a half pin for use in conjunction with external fixators, in which the half pin has a thin hydroxyapatite coating over a substantial portion thereof, a not-sharp hole-finding tip, and a variable pitch pattern in the threaded portion of the half pin. The hydroxyapatite coating must be thin—40-70 microns, deposited by plasma spray—and with limited porosity and pore size, and must extend not only over all the threads of the half pin but also a substantial portion of the unthreaded shaft proximal to the threaded end. The invention also includes a pin cube for use in association with the coated half pins. Wires may also be coated with the hydroxyapatite coating.

An external bone fixation system may include a first semi-circular external fixation member, a second semi-circular external fixation member, four ball collet assemblies attached to the second external fixation member, and four shafts. Each shaft may include a first end attached to the first external fixation member and a second end with a stop member, and each of the four shafts extends slidably through an opening in a ball of one of the four ball collet assemblies. The stop member of each second end prevents each second end from passing through the opening in its respective ball. Each shaft also includes a hinge located closer to the first end than to the second end.

An strut assembly extends along a strut axis and comprises a strut body, an actuator, and a locking assembly. The strut body includes a rod and a sleeve. The rod is translatable relative to the sleeve along the strut axis. The actuator is linearly engaged with the sleeve such that linear movement of the actuator causes linear movement of the sleeve. The locking assembly includes a lock member configured to transition between a locked position in which the lock member engages both the sleeve and the actuator such that rotation between the sleeve and the actuator is substantially prevented, and an unlocked position in which the lock member is spaced apart from the sleeve such that the actuator is substantially free to rotate about the sleeve.