Hip & Knee Surgery - Orthoworld

EXECUTIVE INTERVIEWcontinued from page 14Exhibit 1: Broad array of neckoptions efficiently targets a widerange of patient anatomies.However, it’s not simply about treating the predictably challengingcases. Personalized care is also about addressing theunpredictable anatomical condition or implant position. The innovativesystem of modular necks allows the surgeon to efficientlyrespond intraoperatively to excessive femoral version, muscle laxityor contracture, discrepancies with x-ray templating and unanticipatedcup version, depth or height. The intraoperative flexibilityof independent leg length, offset and version aids the surgeonto equalize leg length, reduce the incidence of impingement andoptimize range of motion unlike ever before.OPN: What effect does the Kinectiv modular head technology have onrange of motion?OPN: How does the M/L Taper with Kinectiv Technology meetZimmer’s commitment to personalized orthopaedics?MM: This system was designed to help surgeons address a widerange of bone morphologies. For example, Exhibit 2 illustratesthat women tend to have lower head centers, less offset andgreater anteversion, whereas men tend to have greater offset andless anteversion. 1-7 The short leg length neck options available inZimmer’s system have been designed for surgeons to address thechallenging varus femoral anatomy, commonly seen in femalepatients, without having to perform low, bone-sacrificingosteotomies to restore leg length. These gender-specific tendenciesare profound, but we also recognize that there is a wide anatomicalvariation within male and female populations. These areaddressed by offering head centers that better match the full rangeof anatomies for both men and women. Our system offers 60 headcenter solutions with five offset options for a given leg length, fiveleg length options for a given femoral offset in 4mm increments,and anteverted and retroverted options for each leg length/offsetcombination.MM: The keystone to Kinectiv Technology is the use of +0 femoralheads exclusively. Range of motion and joint stability are primaryissues in total hip replacement. With the sole use of the +0 head,every neck geometry has been optimized to this head length tobenefit range of motion. This also eliminates the use of skirtedfemoral heads that are necessary for the longer offset option incompeting systems. The ante/retroverted necks allow the surgeonto intraoperatively fine-tune the range of motion depending onthe patient anatomy and implant position. (See Exhibit 3.) The versatilityof a modular neck system allows the surgeon to restore leglength, offset and version to create a well balanced soft tissue environment.By combining the most accurate head position with thebest neck option for the patient, surgeons can optimize range ofmotion and minimize the likelihood of instability and dislocation.Exhibit 3: Anteverted neck resolves neck impingement.Exhibit 2: Plotting head height and offset reveals two distinct populations:female and male.OPN: Is there anything further about the Zimmer M/L Taper withKinectiv Technology?MM: I think it’s important to stress that Zimmer offers thisincreased flexibility to surgeons without introducing increasedcontinued on page 1816 ORTHOPAEDIC PRODUCT NEWS • November/December 2009