Synovial Chondrosarcoma Arising in Synovial Chondromatosis

Table 1

Details of the patients, their tumours, and the outcome.

Case	Age at diagnosis with SC (years)	Site	Treatment(s) for SC	Time to malignant change (years)	Malignancy	Surgical management of chondrosarcoma	Mets	Outcome
1	23	Hip	3 debridements	2.7	Grade I CHS	Hindquarter amputation	—	Alive 13 yrs postoperatively
2	48	Hip	(i) Initially symptomatic; (ii) THR 11 yrs after initial diagnosis	11.3	Dedifferentiated chondrosarcoma (osteosarcoma)	Debulking	At presentation (lung)	Died 3 yrs postoperatively
3	25	Hip	(i) 2 arthroscopies; (ii) 1 hip resurfacing 17 yrs after diagnosis	20	Grade II CHS	Debulking	At presentation (lung)	Died 4 yrs postoperatively
4	25	Hip	(i) Multiple debridements; (ii) THR 2005; (iii) Large recurrence 5 years after THR	39	Grade I CHS	Hindquarter amputation	—	Alive 9 months postoperatively
5	19	Knee	(i) Multiple arthroscopies; (ii) TKR aged 55	38.5	Grade II CHS	Above knee amputation	Lung—34 months after amputation	Died 4 yrs postoperatively