Wear characteristics of the canine acetabulum against different femoral prostheses

Pyrolytic Carbon Endoprosthetic Replacement for Osteonecrosis and Femoral Fracture of the Hip: A Pilot Study

“…Although hemiarthroplasty has been associated with groin pain [4,21,26,27,44] and head migration [4,21,44], the treatment would be beneficial in young patients if acetabular wear could be substantially reduced. LTI pyrolytic carbon hemiarthroplasty showed substantially less wear than titanium or cobalt chromium-molybdenum alloys in a canine model [8]. This benefit was anticipated but not realized in our human hemiarthroplasty application.…”

“…The use of this material in phalangeal joint replacement has been associated with decreased pain, increased range of motion, and a 10-year survival rate of 81.4% [6,38,43]. Canine hip studies using LTI pyrolytic carbon hemiarthroplasty suggest decreased acetabular cartilage wear compared with metal heads [8,29,30,47]. One study [8] examined cartilage degeneration in 45 dogs that underwent hemiarthroplasty with three articulating surface materials: (1) LTI pyrolytic carbon; (2) cobalt-chromiummolybdenum alloy; and (3) titanium alloy.…”

“…Canine hip studies using LTI pyrolytic carbon hemiarthroplasty suggest decreased acetabular cartilage wear compared with metal heads [8,29,30,47]. One study [8] examined cartilage degeneration in 45 dogs that underwent hemiarthroplasty with three articulating surface materials: (1) LTI pyrolytic carbon; (2) cobalt-chromiummolybdenum alloy; and (3) titanium alloy. The LTI pyrolytic carbon group had a 92% acetabular cartilage survival probability, whereas the cobalt-chromium-molybdenum and titanium alloy groups had only a 20% probability for survival.…”

Partial hemiarthroplasty for the treatment of osteonecrosis of the femoral head

“…Surface and interfacial mechanical properties, such as surface roughness, elastic modulus and contact pressure, are closely related to the wear and degeneration of cartilage which articulates with different material implants. 24 In an earlier study, 25 to determine the coefficient of friction of cartilage/cartilage, COD/ cartilage, alumina ceramics/cartilage and UHMWPE/cartilage, there was a higher coefficient of friction for articular cartilage against alumina than against the PVA-H of the COD (Fig. 14).…”

Tribology of Hemiarthroplasty

“…Experimental studies of cartilage plugs have found that the repetitive loading disrupted the tissue and the severity of the damage increased with increasing load and increasing number of loading cycles (Zimmerman et aI., 1988). Three main effects of repetitive loading were concluded from Zimmerman's experiments: (1) joints (Cruess et al, 1984;Cook et al, 1989;Maistrelli et al, 1991). However, under dynamic loading the tribological properties of confined cartilage samples invitro remain largely unknown.…”