Patent ID: 9554813
Date: 2017-01-31
CPC Classifications: A61B,A61F

Claim:
1. A patella drill guide and trial instrument, comprising: a single monolithic polymeric body, comprising: (i) a posterior trial bearing surface configured to articulate with a condylar surface of a prosthetic femoral component, the posterior trial bearing surface comprising a curved peak surface that defines the posterior-most surface of the patella drill guide and trial instrument, (ii) an anterior surface having a plurality of spikes extending outwardly therefrom that are configured to engage a surgically-prepared posterior surface of a patient's patella to prevent the patella drill guide and trial instrument from rotating with respect to the patient's patella when the anterior surface is engaged with the surgically-prepared posterior surface of the patient's patella, and (iii) a number of drill guide holes extending through the patella drill guide and trial instrument from the posterior trial bearing surface to the anterior surface, and a metallic sleeve inserted into each of the number of drill guide holes, wherein the plurality of spikes includes a center spike and a number of peripheral spikes, the center spike is longer than the number of peripheral spikes, wherein the patella drill guide and trial instrument is configured to be positioned in a first position where only the center spike engages the surgically-prepared posterior surface of a patient's patella to allow rotational positioning of the patella drill guide and trial instrument relative to the patient's patella about a central axis defined by the center spike, and wherein the patella drill guide and trial instrument is configured to be positioned in a second position where both the center spike and the number of peripheral spikes engage the surgically-prepared posterior surface of a patient's patella to prevent the patella drill guide and trial instrument from rotating with respect to the patient's patella.