Insall, Scott, and Ranawat report outcomes of the first 220 consecutive total condylar knee arthroplasties at HSS in 183 patients. Follow-up was 3-5 years. The study asks whether a cruciate-sacrificing surface replacement can achieve reliable results across the full spectrum of knee pathology, including severe deformity and inflammatory arthritis.
Every principle you follow in TKA today traces back to this paper.
Before the total condylar design, knee arthroplasty was fragmented across hinges, unicompartmental implants, and bicondylar designs that preserved the cruciates — with loosening rates, failure rates, and functional outcomes far worse than hip replacement. Insall's group demonstrated that one cruciate-sacrificing design, used reproducibly across all deformity patterns, could match hip arthroplasty results.
When you encounter severe varus in the OR, you release the medial sleeve (periosteum, pes, superficial MCL) from the tibia. Not tighten the lateral side. When you face fixed valgus, you release from the femur and isolate the peroneal nerve first. These are not suggestions from this paper; they are the standard of care it established.
Do not perform routine lateral patellar release. This paper explicitly flags it as a cause of patellar fracture through devascularization, and recommends it only for patellar subluxation associated with valgus deformity.
The HSS Knee Rating Scale used here (excellent 85-100, good 70-84, fair 60-69, poor <60, fusion = 60) was the field's primary outcomes instrument through the 1980s-90s and remains an OITE-testable classification.
Insall, Scott, and Ranawat report outcomes of the first 220 consecutive total condylar knee arthroplasties at HSS in 183 patients. Follow-up was 3-5 years. The study asks whether a cruciate-sacrificing surface replacement can achieve reliable results across the full spectrum of knee pathology, including severe deformity and inflammatory arthritis.
Every principle you follow in TKA today traces back to this paper.
Before the total condylar design, knee arthroplasty was fragmented across hinges, unicompartmental implants, and bicondylar designs that preserved the cruciates — with loosening rates, failure rates, and functional outcomes far worse than hip replacement. Insall's group demonstrated that one cruciate-sacrificing design, used reproducibly across all deformity patterns, could match hip arthroplasty results.
When you encounter severe varus in the OR, you release the medial sleeve (periosteum, pes, superficial MCL) from the tibia. Not tighten the lateral side. When you face fixed valgus, you release from the femur and isolate the peroneal nerve first. These are not suggestions from this paper; they are the standard of care it established.
Do not perform routine lateral patellar release. This paper explicitly flags it as a cause of patellar fracture through devascularization, and recommends it only for patellar subluxation associated with valgus deformity.
The HSS Knee Rating Scale used here (excellent 85-100, good 70-84, fair 60-69, poor <60, fusion = 60) was the field's primary outcomes instrument through the 1980s-90s and remains an OITE-testable classification.