Adjustable tibial osteotomy jig and method

Claim 1

An adjustable tibial osteotomy jig, comprising: a. a goniometer, the goniometer further comprising: (1) first and second arms; (2) a pivot movably connecting the arms; (3) a locking device for locking the arms in a pre-determined angular relationship; b. a proximal cutting guide, slidably mounted on the first arm; c. a distal cutting guide, slidably mounted on the second arm; d. each of the cutting guides having a transverse slot extending therethrough to define a cutting surface, and one or more holes extending therethrough; and, e. a clamp connected to each cutting guide for locking each cutting guide in a predetermined radial position along its respective arm.

Claim 10

A method of performing a tibial osteotomy, comprising the steps of: a. providing a an adjustable tibial osteotomy jig, the jig comprising: (1) a goniometer, the goniometer further comprising: (i) first and second arms; (ii) a pivot movably connecting the arms; the pivot having a bore therethrough; (iii) a locking device for locking the arms in a predetermined angular relationship; (2) a proximal cutting guide, slidably mounted on the first arm; (3) a distal cutting guide, slidably mounted on the second arm; (4) each of the cutting guides having a transverse slot extending therethrough to define a cutting surface, and one or more holes extending therethrough; and, (5) a clamp connected to each cutting guide for locking each cutting guide in a predetermined radial position along its respective arm; b. calculating a correction angle appropriate to the osteotomy and determining the lateral line for the transverse osteotomy cut; c. placing the proximal cutting guide against the tibia in a predetermined position below the lateral line; d. fixing the proximal cutting guide in the predetermined position by passing one or more guide pins through the holes in the proximal cutting guide and into the tibia; e. extending a saw blade through the transverse slot of the proximal cutting guide and making a transverse cut through the tibia to a distance less than the depth of the tibia; f. attaching the first arm of the goniometer through the clamp of the proximal cutting guide and locking the first arm into a predetermined position with the clamp; g. fixing the goniometer to the tibia in the predetermined position by inserting a fixation pin through the bore and into the tibia; h. adjusting the relative angle of the goniometer arms to the calculated correction angle by adjusting the second arm of the goniometer; i. locking the goniometer arms to maintain the calculated correction angle; j. placing the distal cutting guide onto the second arm of the goniometer by passing the clamp of the distal cutting guide over the second arm to a position near the tibia; k. locking the distal cutting guide onto the second arm; j. fixing the distal cutting guide in the predetermined position just obtained by passing one or more guide pins through the holes in the distal cutting guide and into the tibia; k. extending a saw blade trough the transverse slot of the distal cutting guide and making an oblique cut through the tibia to a distance less than the depth of the tibia, and meeting the reverse cut; l. removing a wedge-shaped portion of the tibia formed by the transverse and oblique cuts through the tibia to form a void in the tibia; the void being defined by an upper side, created by the transverse cut, and a lower side, created by the oblique cut; and, m. drawing the upper and lower sides of the tibia together and permanently closing the void.

Claim 11

A method of performing a tibial osteotomy, comprising the steps of: a. providing a an adjustable tibial osteotomy jig, the jig comprising: (1) a goniometer, the goniometer further comprising: (i) first and second arms; (ii) a pivot movably connecting the arms; the pivot having a bore therethrough; (iii) a locking device for locking the arms in a predetermined angular relationship; (2) a proximal cutting guide, slidably mounted on the first arm; (3) a distal cutting guide, slidably mounted on the second arm; (4) each of the cutting guides having a transverse slot extending therethrough to define a cutting surface, and one or more holes extending therethrough; and, (5) a clamp connected to each cutting guide for locking each cutting guide in a predetermined radial position along its respective arm; b. calculating a correction angle appropriate to the osteotomy and determining the lateral line for the transverse osteotomy cut; c. placing the proximal cutting guide against the tibia in a predetermined position below the lateral line; d. fixing the proximal cutting guide in the predetermined position by passing one or more guide pins through the holes in the proximal cutting guide and into the tibia; e. extending a saw blade through the transverse slot of the proximal cutting guide and making a transverse cut through the tibia to a distance less than the depth of the tibia; f. attaching the first arm of the goniometer through the clamp of the proximal cutting guide and locking the first arm into a predetermined position with the clamp; g. fixing the goniometer to the tibia in the predetermined position by inserting a fixation pin through the bore and into the tibia; h. adjusting the relative angle of the goniometer arms to the calculated correction angle by adjusting the second arm of the goniometer; i. locking the goniometer arms to maintain the calculated correction angle; j. placing the distal cutting guide onto the second arm of the goniometer by passing the clamp of the distal cutting guide over the second arm to a position near the tibia; k. locking the distal cutting guide onto the second arm; j. fixing the distal cutting guide in the predetermined position just obtained by passing one or more guide pins through the holes in the distal cutting guide and into the tibia; k. extending a saw blade trough the transverse slot of the distal cutting guide and making an oblique cut through the tibia to a distance less than the depth of the tibia, and meeting the reverse cut; l. removing a wedge-shaped portion of the tibia formed by the transverse and oblique cuts through the tibia to form a void in the tibia; the void being defined by an upper side, created by the transverse cut, and a lower side, created by the oblique cut; and, m. drawing the upper and lower sides of the tibia together and permanently closing the void.