Hand Anatomy Volar Plate
The volar plate flap is elevated by detaching the proximal end of the volar plate from the metacarpal fig.
Hand anatomy volar plate. At the pip joints there are thin proximal expansions on either side of the volar plate called. These insert firmly distally to the phalanx base and loosely proximally via two check rein ligaments which fold allowing flexion diagram 3.
Distally it is firmly attached to the volar lip of the base of the middle phalanx. The volar plate is exposed and a u shaped trapdoor incision is designed on the volar plate of the mcp joint fig.
Mri anatomy of volar plates. Volar plate avulsion injuries are a type of avulsion injury.
The small intrinsic muscles of the hand and fingers can tighten up from hand trauma ra and various nerve disorders such as cerebral palsy parkinson s disease or stroke. The muscle imbalance tends to weaken the volar plate and pull the pip joint into extension.
When a volar plate rupture is with a large avulsion fracture surgical treatment is indicated. Proximally the attachment of the volar plate to the proximal phalanx is more elastic and is u shaped due to two lateral bands which are called the checkrein ligaments.
Weakness in the volar plate can also occur from a finger injury that forces. The thinner proximal margin of the volar plate merges with the volar periosteum.
First it slides back toward the hand. The volar plate prevents hyperextension of the pip joint 15.
Surgical treatment may be recommended for cases of significant joint instability that fails treatment with extension block splinting. The volar plate of the proximal interphalangeal pip joint is vulnerable to hyperextension injury in the form of either a ligament tear or an intra articular fracture.
3 chronic volar plate injuries are treated with criss cross volar tendon grafts or reattachment or repair of the volar plate or repair with a flexor digitorum. 5 baht level i anatomy volar plate palmar plate the volar plate is a fibrocartilage plate which lies on the palmar aspect of the mcp joint pip joint and dip joints.
The palmar plate moves in three phases during joint flexion. Volar plate a strong ligament that connects the proximal to the middle phalanges on the palmar side of every joint of the hand and protects the fingers from hyperextension.
Dorsally the pip. Due to its fibrocartilaginous composition the plate is thus able to 1 resist tensile stresses while 2 restricting hyperextension and compression and 3 protecting the volar articular surface.
Collateral ligaments ligaments found on each side of each joint on the fingers and thumb that serve to prevent abnormal sideways bending. From a study of 60 fresh adult specimens the authors present a consolidated anatomic concept of this structure emphasizing the distinctiveness of the proximal attachments the variable nature of the distal attachments and the complex relationships to the flexor sheaths the.
The anatomy and biomechanics of the volar plate are reviewed.
