Abstract
The majority of implants available in the market today were designed to allow for a flexion up to 130 degree angle. The LPS Mobile Flex was designed to accommodate deep flexion, up to 160 degree angle. The purpose of this study is to evaluate the clinical result of the LPS Mobile Flex knee.
From January 1999 to February 2004, 635 surgeries were performed on patients treated for advance osteoporosis. All the surgeries were carried out by the same surgeon. The majority of the patients had bilateral total knee replacements simultaneously. Pre-operative ranges of motion were documented on lateral x-ray. Patients were considered to have full flexion if they were able to fix the knee to at least 140 degree angle sit on the ground with calf touching thigh for at least one minute.
68% obtained full flexion as defined above. The majority of the cases with full flexion had full movement pre-operatively, except for 26 cases. Some omplications were reported. There were 2 cases of personal nerve palsy, three of dislocation, and one of infection. There was also a case of rupture of MCL ligament, a case of intra-operative tibial plateau fracture and one of upra-condyler femur fracture. No revision was performed. There were no patella complications
The LPS Flex Implant had a similar complication rate to those reported by other series. There was no complication that could be specifically attributed to deep flexion. Surprisingly, there were no patella complications and the implant, in general, had an excellent clinical outcome as far as mobility. However, it should be stressed that this exceptional result has to do mainly with careful patient selection.
Correspondence should be addressed to Richard Komistek, PhD, International Society for Technology in Arthroplasty, PO Box 6564, Auburn, CA 95604, USA. E-mail: ista@pacbell.net
